1112 lines
37 KiB
C++
1112 lines
37 KiB
C++
/* libs/opengles/primitives.cpp
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "context.h"
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#include "primitives.h"
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#include "light.h"
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#include "matrix.h"
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#include "vertex.h"
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#include "fp.h"
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#include "TextureObjectManager.h"
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extern "C" void iterators0032(const void* that,
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int32_t* it, int32_t c0, int32_t c1, int32_t c2);
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namespace android {
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// ----------------------------------------------------------------------------
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static void primitive_point(ogles_context_t* c, vertex_t* v);
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static void primitive_line(ogles_context_t* c, vertex_t* v0, vertex_t* v1);
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static void primitive_clip_triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void primitive_nop_point(ogles_context_t* c, vertex_t* v);
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static void primitive_nop_line(ogles_context_t* c, vertex_t* v0, vertex_t* v1);
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static void primitive_nop_triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static inline bool cull_triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void lerp_triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void lerp_texcoords(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void lerp_texcoords_w(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static void clip_triangle(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2);
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static unsigned int clip_line(ogles_context_t* c,
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vertex_t* s, vertex_t* p);
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// ----------------------------------------------------------------------------
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#if 0
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#pragma mark -
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#endif
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static void lightTriangleDarkSmooth(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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if (!(v0->flags & vertex_t::LIT)) {
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v0->flags |= vertex_t::LIT;
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const GLvoid* cp = c->arrays.color.element(
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v0->index & vertex_cache_t::INDEX_MASK);
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c->arrays.color.fetch(c, v0->color.v, cp);
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}
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if (!(v1->flags & vertex_t::LIT)) {
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v1->flags |= vertex_t::LIT;
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const GLvoid* cp = c->arrays.color.element(
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v1->index & vertex_cache_t::INDEX_MASK);
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c->arrays.color.fetch(c, v1->color.v, cp);
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}
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if(!(v2->flags & vertex_t::LIT)) {
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v2->flags |= vertex_t::LIT;
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const GLvoid* cp = c->arrays.color.element(
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v2->index & vertex_cache_t::INDEX_MASK);
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c->arrays.color.fetch(c, v2->color.v, cp);
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}
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}
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static void lightTriangleDarkFlat(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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if (!(v2->flags & vertex_t::LIT)) {
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v2->flags |= vertex_t::LIT;
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const GLvoid* cp = c->arrays.color.element(
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v2->index & vertex_cache_t::INDEX_MASK);
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c->arrays.color.fetch(c, v2->color.v, cp);
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}
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// configure the rasterizer here, before we clip
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c->rasterizer.procs.color4xv(c, v2->color.v);
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}
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static void lightTriangleSmooth(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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if (!(v0->flags & vertex_t::LIT))
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c->lighting.lightVertex(c, v0);
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if (!(v1->flags & vertex_t::LIT))
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c->lighting.lightVertex(c, v1);
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if(!(v2->flags & vertex_t::LIT))
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c->lighting.lightVertex(c, v2);
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}
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static void lightTriangleFlat(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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if (!(v2->flags & vertex_t::LIT))
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c->lighting.lightVertex(c, v2);
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// configure the rasterizer here, before we clip
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c->rasterizer.procs.color4xv(c, v2->color.v);
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}
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// The fog versions...
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static inline
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void lightVertexDarkSmoothFog(ogles_context_t* c, vertex_t* v)
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{
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if (!(v->flags & vertex_t::LIT)) {
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v->flags |= vertex_t::LIT;
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v->fog = c->fog.fog(c, v->eye.z);
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const GLvoid* cp = c->arrays.color.element(
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v->index & vertex_cache_t::INDEX_MASK);
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c->arrays.color.fetch(c, v->color.v, cp);
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}
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}
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static inline
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void lightVertexDarkFlatFog(ogles_context_t* c, vertex_t* v)
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{
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if (!(v->flags & vertex_t::LIT)) {
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v->flags |= vertex_t::LIT;
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v->fog = c->fog.fog(c, v->eye.z);
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}
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}
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static inline
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void lightVertexSmoothFog(ogles_context_t* c, vertex_t* v)
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{
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if (!(v->flags & vertex_t::LIT)) {
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v->fog = c->fog.fog(c, v->eye.z);
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c->lighting.lightVertex(c, v);
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}
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}
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static void lightTriangleDarkSmoothFog(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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lightVertexDarkSmoothFog(c, v0);
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lightVertexDarkSmoothFog(c, v1);
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lightVertexDarkSmoothFog(c, v2);
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}
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static void lightTriangleDarkFlatFog(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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lightVertexDarkFlatFog(c, v0);
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lightVertexDarkFlatFog(c, v1);
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lightVertexDarkSmoothFog(c, v2);
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// configure the rasterizer here, before we clip
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c->rasterizer.procs.color4xv(c, v2->color.v);
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}
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static void lightTriangleSmoothFog(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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lightVertexSmoothFog(c, v0);
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lightVertexSmoothFog(c, v1);
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lightVertexSmoothFog(c, v2);
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}
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static void lightTriangleFlatFog(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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lightVertexDarkFlatFog(c, v0);
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lightVertexDarkFlatFog(c, v1);
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lightVertexSmoothFog(c, v2);
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// configure the rasterizer here, before we clip
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c->rasterizer.procs.color4xv(c, v2->color.v);
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}
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typedef void (*light_primitive_t)(ogles_context_t*,
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vertex_t*, vertex_t*, vertex_t*);
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// fog 0x4, light 0x2, smooth 0x1
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static const light_primitive_t lightPrimitive[8] = {
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lightTriangleDarkFlat, // no fog | dark | flat
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lightTriangleDarkSmooth, // no fog | dark | smooth
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lightTriangleFlat, // no fog | light | flat
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lightTriangleSmooth, // no fog | light | smooth
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lightTriangleDarkFlatFog, // fog | dark | flat
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lightTriangleDarkSmoothFog, // fog | dark | smooth
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lightTriangleFlatFog, // fog | light | flat
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lightTriangleSmoothFog // fog | light | smooth
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};
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void ogles_validate_primitives(ogles_context_t* c)
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{
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const uint32_t enables = c->rasterizer.state.enables;
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// set up the lighting/shading/smoothing/fogging function
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int index = enables & GGL_ENABLE_SMOOTH ? 0x1 : 0;
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index |= c->lighting.enable ? 0x2 : 0;
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index |= enables & GGL_ENABLE_FOG ? 0x4 : 0;
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c->lighting.lightTriangle = lightPrimitive[index];
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// set up the primitive renderers
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if (ggl_likely(c->arrays.vertex.enable)) {
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c->prims.renderPoint = primitive_point;
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c->prims.renderLine = primitive_line;
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c->prims.renderTriangle = primitive_clip_triangle;
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} else {
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c->prims.renderPoint = primitive_nop_point;
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c->prims.renderLine = primitive_nop_line;
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c->prims.renderTriangle = primitive_nop_triangle;
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}
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}
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// ----------------------------------------------------------------------------
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void compute_iterators_t::initTriangle(
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vertex_t const* v0, vertex_t const* v1, vertex_t const* v2)
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{
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m_dx01 = v1->window.x - v0->window.x;
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m_dy10 = v0->window.y - v1->window.y;
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m_dx20 = v0->window.x - v2->window.x;
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m_dy02 = v2->window.y - v0->window.y;
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m_area = m_dx01*m_dy02 + (-m_dy10)*m_dx20;
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}
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void compute_iterators_t::initLine(
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vertex_t const* v0, vertex_t const* v1)
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{
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m_dx01 = m_dy02 = v1->window.x - v0->window.x;
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m_dy10 = m_dx20 = v0->window.y - v1->window.y;
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m_area = m_dx01*m_dy02 + (-m_dy10)*m_dx20;
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}
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void compute_iterators_t::initLerp(vertex_t const* v0, uint32_t enables)
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{
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m_x0 = v0->window.x;
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m_y0 = v0->window.y;
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const GGLcoord area = (m_area + TRI_HALF) >> TRI_FRACTION_BITS;
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const GGLcoord minArea = 2; // cannot be inverted
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// triangles with an area smaller than 1.0 are not smooth-shaded
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int q=0, s=0, d=0;
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if (abs(area) >= minArea) {
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// Here we do some voodoo magic, to compute a suitable scale
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// factor for deltas/area:
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// First compute the 1/area with full 32-bits precision,
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// gglRecipQNormalized returns a number [-0.5, 0.5[ and an exponent.
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d = gglRecipQNormalized(area, &q);
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// Then compute the minimum left-shift to not overflow the muls
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// below.
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s = 32 - gglClz(abs(m_dy02)|abs(m_dy10)|abs(m_dx01)|abs(m_dx20));
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// We'll keep 16-bits of precision for deltas/area. So we need
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// to shift everything left an extra 15 bits.
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s += 15;
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// make sure all final shifts are not > 32, because gglMulx
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// can't handle it.
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if (s < q) s = q;
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if (s > 32) {
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d >>= 32-s;
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s = 32;
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}
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}
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m_dx01 = gglMulx(m_dx01, d, s);
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m_dy10 = gglMulx(m_dy10, d, s);
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m_dx20 = gglMulx(m_dx20, d, s);
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m_dy02 = gglMulx(m_dy02, d, s);
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m_area_scale = 32 + q - s;
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m_scale = 0;
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if (enables & GGL_ENABLE_TMUS) {
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const int A = gglClz(abs(m_dy02)|abs(m_dy10)|abs(m_dx01)|abs(m_dx20));
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const int B = gglClz(abs(m_x0)|abs(m_y0));
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m_scale = max(0, 32 - (A + 16)) +
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max(0, 32 - (B + TRI_FRACTION_BITS)) + 1;
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}
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}
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int compute_iterators_t::iteratorsScale(GGLfixed* it,
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int32_t c0, int32_t c1, int32_t c2) const
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{
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int32_t dc01 = c1 - c0;
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int32_t dc02 = c2 - c0;
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const int A = gglClz(abs(c0));
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const int B = gglClz(abs(dc01)|abs(dc02));
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const int scale = min(A, B - m_scale) - 2;
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if (scale >= 0) {
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c0 <<= scale;
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dc01 <<= scale;
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dc02 <<= scale;
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} else {
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c0 >>= -scale;
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dc01 >>= -scale;
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dc02 >>= -scale;
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}
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const int s = m_area_scale;
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int32_t dcdx = gglMulAddx(dc01, m_dy02, gglMulx(dc02, m_dy10, s), s);
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int32_t dcdy = gglMulAddx(dc02, m_dx01, gglMulx(dc01, m_dx20, s), s);
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int32_t c = c0 - (gglMulAddx(dcdx, m_x0,
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gglMulx(dcdy, m_y0, TRI_FRACTION_BITS), TRI_FRACTION_BITS));
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it[0] = c;
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it[1] = dcdx;
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it[2] = dcdy;
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return scale;
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}
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void compute_iterators_t::iterators1616(GGLfixed* it,
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GGLfixed c0, GGLfixed c1, GGLfixed c2) const
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{
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const GGLfixed dc01 = c1 - c0;
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const GGLfixed dc02 = c2 - c0;
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// 16.16 x 16.16 == 32.32 --> 16.16
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const int s = m_area_scale;
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int32_t dcdx = gglMulAddx(dc01, m_dy02, gglMulx(dc02, m_dy10, s), s);
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int32_t dcdy = gglMulAddx(dc02, m_dx01, gglMulx(dc01, m_dx20, s), s);
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int32_t c = c0 - (gglMulAddx(dcdx, m_x0,
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gglMulx(dcdy, m_y0, TRI_FRACTION_BITS), TRI_FRACTION_BITS));
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it[0] = c;
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it[1] = dcdx;
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it[2] = dcdy;
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}
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void compute_iterators_t::iterators0032(int64_t* it,
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int32_t c0, int32_t c1, int32_t c2) const
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{
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const int s = m_area_scale - 16;
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int32_t dc01 = (c1 - c0)>>s;
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int32_t dc02 = (c2 - c0)>>s;
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// 16.16 x 16.16 == 32.32
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int64_t dcdx = gglMulii(dc01, m_dy02) + gglMulii(dc02, m_dy10);
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int64_t dcdy = gglMulii(dc02, m_dx01) + gglMulii(dc01, m_dx20);
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it[ 0] = (c0<<16) - ((dcdx*m_x0 + dcdy*m_y0)>>4);
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it[ 1] = dcdx;
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it[ 2] = dcdy;
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}
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#if defined(__arm__) && !defined(__thumb__)
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inline void compute_iterators_t::iterators0032(int32_t* it,
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int32_t c0, int32_t c1, int32_t c2) const
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{
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::iterators0032(this, it, c0, c1, c2);
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}
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#else
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void compute_iterators_t::iterators0032(int32_t* it,
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int32_t c0, int32_t c1, int32_t c2) const
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{
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int64_t it64[3];
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iterators0032(it64, c0, c1, c2);
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it[0] = it64[0];
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it[1] = it64[1];
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it[2] = it64[2];
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}
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#endif
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// ----------------------------------------------------------------------------
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static inline int32_t clampZ(GLfixed z) CONST;
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int32_t clampZ(GLfixed z) {
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z = (z & ~(z>>31));
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if (z >= 0x10000)
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z = 0xFFFF;
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return z;
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}
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static __attribute__((noinline))
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void fetch_texcoord_impl(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
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vertex_t* const vtx[3] = { v0, v1, v2 };
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array_t const * const texcoordArray = c->arrays.texture;
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for (int i=0 ; i<GGL_TEXTURE_UNIT_COUNT ; i++) {
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if (!(c->rasterizer.state.texture[i].enable))
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continue;
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for (int j=0 ; j<3 ; j++) {
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vertex_t* const v = vtx[j];
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if (v->flags & vertex_t::TT)
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continue;
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// NOTE: here we could compute automatic texgen
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// such as sphere/cube maps, instead of fetching them
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// from the textcoord array.
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vec4_t& coords = v->texture[i];
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const GLubyte* tp = texcoordArray[i].element(
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v->index & vertex_cache_t::INDEX_MASK);
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texcoordArray[i].fetch(c, coords.v, tp);
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// transform texture coordinates...
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coords.Q = 0x10000;
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const transform_t& tr = c->transforms.texture[i].transform;
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if (ggl_unlikely(tr.ops)) {
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c->arrays.tex_transform[i](&tr, &coords, &coords);
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}
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// divide by Q
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const GGLfixed q = coords.Q;
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if (ggl_unlikely(q != 0x10000)) {
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const int32_t qinv = gglRecip28(q);
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coords.S = gglMulx(coords.S, qinv, 28);
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coords.T = gglMulx(coords.T, qinv, 28);
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}
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}
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}
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v0->flags |= vertex_t::TT;
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v1->flags |= vertex_t::TT;
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v2->flags |= vertex_t::TT;
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}
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inline void fetch_texcoord(ogles_context_t* c,
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vertex_t* v0, vertex_t* v1, vertex_t* v2)
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{
|
|
const uint32_t enables = c->rasterizer.state.enables;
|
|
if (!(enables & GGL_ENABLE_TMUS))
|
|
return;
|
|
|
|
// Fetch & transform texture coordinates...
|
|
if (ggl_likely(v0->flags & v1->flags & v2->flags & vertex_t::TT)) {
|
|
// already done for all three vertices, bail...
|
|
return;
|
|
}
|
|
fetch_texcoord_impl(c, v0, v1, v2);
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
#if 0
|
|
#pragma mark -
|
|
#pragma mark Point
|
|
#endif
|
|
|
|
void primitive_nop_point(ogles_context_t*, vertex_t*) {
|
|
}
|
|
|
|
void primitive_point(ogles_context_t* c, vertex_t* v)
|
|
{
|
|
// lighting & clamping...
|
|
const uint32_t enables = c->rasterizer.state.enables;
|
|
|
|
if (ggl_unlikely(!(v->flags & vertex_t::LIT))) {
|
|
if (c->lighting.enable) {
|
|
c->lighting.lightVertex(c, v);
|
|
} else {
|
|
v->flags |= vertex_t::LIT;
|
|
const GLvoid* cp = c->arrays.color.element(
|
|
v->index & vertex_cache_t::INDEX_MASK);
|
|
c->arrays.color.fetch(c, v->color.v, cp);
|
|
}
|
|
if (enables & GGL_ENABLE_FOG) {
|
|
v->fog = c->fog.fog(c, v->eye.z);
|
|
}
|
|
}
|
|
|
|
// XXX: we don't need to do that each-time
|
|
// if color array and lighting not enabled
|
|
c->rasterizer.procs.color4xv(c, v->color.v);
|
|
|
|
// XXX: look into ES point-sprite extension
|
|
if (enables & GGL_ENABLE_TMUS) {
|
|
fetch_texcoord(c, v,v,v);
|
|
for (int i=0 ; i<GGL_TEXTURE_UNIT_COUNT ; i++) {
|
|
if (!c->rasterizer.state.texture[i].enable)
|
|
continue;
|
|
int32_t itt[8];
|
|
itt[1] = itt[2] = itt[4] = itt[5] = 0;
|
|
itt[6] = itt[7] = 16; // XXX: check that
|
|
if (c->rasterizer.state.texture[i].s_wrap == GGL_CLAMP) {
|
|
int width = c->textures.tmu[i].texture->surface.width;
|
|
itt[0] = v->texture[i].S * width;
|
|
itt[6] = 0;
|
|
}
|
|
if (c->rasterizer.state.texture[i].t_wrap == GGL_CLAMP) {
|
|
int height = c->textures.tmu[i].texture->surface.height;
|
|
itt[3] = v->texture[i].T * height;
|
|
itt[7] = 0;
|
|
}
|
|
c->rasterizer.procs.texCoordGradScale8xv(c, i, itt);
|
|
}
|
|
}
|
|
|
|
if (enables & GGL_ENABLE_DEPTH_TEST) {
|
|
int32_t itz[3];
|
|
itz[0] = clampZ(v->window.z) * 0x00010001;
|
|
itz[1] = itz[2] = 0;
|
|
c->rasterizer.procs.zGrad3xv(c, itz);
|
|
}
|
|
|
|
if (enables & GGL_ENABLE_FOG) {
|
|
GLfixed itf[3];
|
|
itf[0] = v->fog;
|
|
itf[1] = itf[2] = 0;
|
|
c->rasterizer.procs.fogGrad3xv(c, itf);
|
|
}
|
|
|
|
// Render our point...
|
|
c->rasterizer.procs.pointx(c, v->window.v, c->point.size);
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
#if 0
|
|
#pragma mark -
|
|
#pragma mark Line
|
|
#endif
|
|
|
|
void primitive_nop_line(ogles_context_t*, vertex_t*, vertex_t*) {
|
|
}
|
|
|
|
void primitive_line(ogles_context_t* c, vertex_t* v0, vertex_t* v1)
|
|
{
|
|
// get texture coordinates
|
|
fetch_texcoord(c, v0, v1, v1);
|
|
|
|
// light/shade the vertices first (they're copied below)
|
|
c->lighting.lightTriangle(c, v0, v1, v1);
|
|
|
|
// clip the line if needed
|
|
if (ggl_unlikely((v0->flags | v1->flags) & vertex_t::CLIP_ALL)) {
|
|
unsigned int count = clip_line(c, v0, v1);
|
|
if (ggl_unlikely(count == 0))
|
|
return;
|
|
}
|
|
|
|
// compute iterators...
|
|
const uint32_t enables = c->rasterizer.state.enables;
|
|
const uint32_t mask = GGL_ENABLE_TMUS |
|
|
GGL_ENABLE_SMOOTH |
|
|
GGL_ENABLE_W |
|
|
GGL_ENABLE_FOG |
|
|
GGL_ENABLE_DEPTH_TEST;
|
|
|
|
if (ggl_unlikely(enables & mask)) {
|
|
c->lerp.initLine(v0, v1);
|
|
lerp_triangle(c, v0, v1, v0);
|
|
}
|
|
|
|
// render our line
|
|
c->rasterizer.procs.linex(c, v0->window.v, v1->window.v, c->line.width);
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
#if 0
|
|
#pragma mark -
|
|
#pragma mark Triangle
|
|
#endif
|
|
|
|
void primitive_nop_triangle(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2) {
|
|
}
|
|
|
|
void primitive_clip_triangle(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
uint32_t cc = (v0->flags | v1->flags | v2->flags) & vertex_t::CLIP_ALL;
|
|
if (ggl_likely(!cc)) {
|
|
// code below must be as optimized as possible, this is the
|
|
// common code path.
|
|
|
|
// This triangle is not clipped, test if it's culled
|
|
// unclipped triangle...
|
|
c->lerp.initTriangle(v0, v1, v2);
|
|
if (cull_triangle(c, v0, v1, v2))
|
|
return; // culled!
|
|
|
|
// Fetch all texture coordinates if needed
|
|
fetch_texcoord(c, v0, v1, v2);
|
|
|
|
// light (or shade) our triangle!
|
|
c->lighting.lightTriangle(c, v0, v1, v2);
|
|
|
|
triangle(c, v0, v1, v2);
|
|
return;
|
|
}
|
|
|
|
// The assumption here is that we're not going to clip very often,
|
|
// and even more rarely will we clip a triangle that ends up
|
|
// being culled out. So it's okay to light the vertices here, even though
|
|
// in a few cases we won't render the triangle (if culled).
|
|
|
|
// Fetch texture coordinates...
|
|
fetch_texcoord(c, v0, v1, v2);
|
|
|
|
// light (or shade) our triangle!
|
|
c->lighting.lightTriangle(c, v0, v1, v2);
|
|
|
|
clip_triangle(c, v0, v1, v2);
|
|
}
|
|
|
|
// -----------------------------------------------------------------------
|
|
|
|
void triangle(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
// compute iterators...
|
|
const uint32_t enables = c->rasterizer.state.enables;
|
|
const uint32_t mask = GGL_ENABLE_TMUS |
|
|
GGL_ENABLE_SMOOTH |
|
|
GGL_ENABLE_W |
|
|
GGL_ENABLE_FOG |
|
|
GGL_ENABLE_DEPTH_TEST;
|
|
|
|
if (ggl_likely(enables & mask))
|
|
lerp_triangle(c, v0, v1, v2);
|
|
|
|
c->rasterizer.procs.trianglex(c, v0->window.v, v1->window.v, v2->window.v);
|
|
}
|
|
|
|
void lerp_triangle(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
const uint32_t enables = c->rasterizer.state.enables;
|
|
c->lerp.initLerp(v0, enables);
|
|
|
|
// set up texture iterators
|
|
if (enables & GGL_ENABLE_TMUS) {
|
|
if (enables & GGL_ENABLE_W) {
|
|
lerp_texcoords_w(c, v0, v1, v2);
|
|
} else {
|
|
lerp_texcoords(c, v0, v1, v2);
|
|
}
|
|
}
|
|
|
|
// set up the color iterators
|
|
const compute_iterators_t& lerp = c->lerp;
|
|
if (enables & GGL_ENABLE_SMOOTH) {
|
|
GLfixed itc[12];
|
|
for (int i=0 ; i<4 ; i++) {
|
|
const GGLcolor c0 = v0->color.v[i] * 255;
|
|
const GGLcolor c1 = v1->color.v[i] * 255;
|
|
const GGLcolor c2 = v2->color.v[i] * 255;
|
|
lerp.iterators1616(&itc[i*3], c0, c1, c2);
|
|
}
|
|
c->rasterizer.procs.colorGrad12xv(c, itc);
|
|
}
|
|
|
|
if (enables & GGL_ENABLE_DEPTH_TEST) {
|
|
int32_t itz[3];
|
|
const int32_t v0z = clampZ(v0->window.z);
|
|
const int32_t v1z = clampZ(v1->window.z);
|
|
const int32_t v2z = clampZ(v2->window.z);
|
|
if (ggl_unlikely(c->polygonOffset.enable)) {
|
|
const int32_t units = (c->polygonOffset.units << 16);
|
|
const GLfixed factor = c->polygonOffset.factor;
|
|
if (factor) {
|
|
int64_t itz64[3];
|
|
lerp.iterators0032(itz64, v0z, v1z, v2z);
|
|
int64_t maxDepthSlope = max(itz64[1], itz64[2]);
|
|
itz[0] = uint32_t(itz64[0])
|
|
+ uint32_t((maxDepthSlope*factor)>>16) + units;
|
|
itz[1] = uint32_t(itz64[1]);
|
|
itz[2] = uint32_t(itz64[2]);
|
|
} else {
|
|
lerp.iterators0032(itz, v0z, v1z, v2z);
|
|
itz[0] += units;
|
|
}
|
|
} else {
|
|
lerp.iterators0032(itz, v0z, v1z, v2z);
|
|
}
|
|
c->rasterizer.procs.zGrad3xv(c, itz);
|
|
}
|
|
|
|
if (ggl_unlikely(enables & GGL_ENABLE_FOG)) {
|
|
GLfixed itf[3];
|
|
lerp.iterators1616(itf, v0->fog, v1->fog, v2->fog);
|
|
c->rasterizer.procs.fogGrad3xv(c, itf);
|
|
}
|
|
}
|
|
|
|
|
|
static inline
|
|
int compute_lod(ogles_context_t* c, int i,
|
|
int32_t s0, int32_t t0, int32_t s1, int32_t t1, int32_t s2, int32_t t2)
|
|
{
|
|
// Compute mipmap level / primitive
|
|
// rho = sqrt( texelArea / area )
|
|
// lod = log2( rho )
|
|
// lod = log2( texelArea / area ) / 2
|
|
// lod = (log2( texelArea ) - log2( area )) / 2
|
|
const compute_iterators_t& lerp = c->lerp;
|
|
const GGLcoord area = abs(lerp.area());
|
|
const int w = c->textures.tmu[i].texture->surface.width;
|
|
const int h = c->textures.tmu[i].texture->surface.height;
|
|
const int shift = 16 + (16 - TRI_FRACTION_BITS);
|
|
int32_t texelArea = abs( gglMulx(s1-s0, t2-t0, shift) -
|
|
gglMulx(s2-s0, t1-t0, shift) )*w*h;
|
|
int log2TArea = (32-TRI_FRACTION_BITS -1) - gglClz(texelArea);
|
|
int log2Area = (32-TRI_FRACTION_BITS*2-1) - gglClz(area);
|
|
int lod = (log2TArea - log2Area + 1) >> 1;
|
|
return lod;
|
|
}
|
|
|
|
void lerp_texcoords(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
const compute_iterators_t& lerp = c->lerp;
|
|
int32_t itt[8] __attribute__((aligned(16)));
|
|
for (int i=0 ; i<GGL_TEXTURE_UNIT_COUNT ; i++) {
|
|
const texture_t& tmu = c->rasterizer.state.texture[i];
|
|
if (!tmu.enable)
|
|
continue;
|
|
|
|
// compute the jacobians using block floating-point
|
|
int32_t s0 = v0->texture[i].S;
|
|
int32_t t0 = v0->texture[i].T;
|
|
int32_t s1 = v1->texture[i].S;
|
|
int32_t t1 = v1->texture[i].T;
|
|
int32_t s2 = v2->texture[i].S;
|
|
int32_t t2 = v2->texture[i].T;
|
|
|
|
const GLenum min_filter = c->textures.tmu[i].texture->min_filter;
|
|
if (ggl_unlikely(min_filter >= GL_NEAREST_MIPMAP_NEAREST)) {
|
|
int lod = compute_lod(c, i, s0, t0, s1, t1, s2, t2);
|
|
c->rasterizer.procs.bindTextureLod(c, i,
|
|
&c->textures.tmu[i].texture->mip(lod));
|
|
}
|
|
|
|
// premultiply (s,t) when clampling
|
|
if (tmu.s_wrap == GGL_CLAMP) {
|
|
const int width = tmu.surface.width;
|
|
s0 *= width;
|
|
s1 *= width;
|
|
s2 *= width;
|
|
}
|
|
if (tmu.t_wrap == GGL_CLAMP) {
|
|
const int height = tmu.surface.height;
|
|
t0 *= height;
|
|
t1 *= height;
|
|
t2 *= height;
|
|
}
|
|
itt[6] = -lerp.iteratorsScale(itt+0, s0, s1, s2);
|
|
itt[7] = -lerp.iteratorsScale(itt+3, t0, t1, t2);
|
|
c->rasterizer.procs.texCoordGradScale8xv(c, i, itt);
|
|
}
|
|
}
|
|
|
|
void lerp_texcoords_w(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
const compute_iterators_t& lerp = c->lerp;
|
|
int32_t itt[8] __attribute__((aligned(16)));
|
|
int32_t itw[3];
|
|
|
|
// compute W's scale to 2.30
|
|
int32_t w0 = v0->window.w;
|
|
int32_t w1 = v1->window.w;
|
|
int32_t w2 = v2->window.w;
|
|
int wscale = 32 - gglClz(w0|w1|w2);
|
|
|
|
// compute the jacobian using block floating-point
|
|
int sc = lerp.iteratorsScale(itw, w0, w1, w2);
|
|
sc += wscale - 16;
|
|
c->rasterizer.procs.wGrad3xv(c, itw);
|
|
|
|
for (int i=0 ; i<GGL_TEXTURE_UNIT_COUNT ; i++) {
|
|
const texture_t& tmu = c->rasterizer.state.texture[i];
|
|
if (!tmu.enable)
|
|
continue;
|
|
|
|
// compute the jacobians using block floating-point
|
|
int32_t s0 = v0->texture[i].S;
|
|
int32_t t0 = v0->texture[i].T;
|
|
int32_t s1 = v1->texture[i].S;
|
|
int32_t t1 = v1->texture[i].T;
|
|
int32_t s2 = v2->texture[i].S;
|
|
int32_t t2 = v2->texture[i].T;
|
|
|
|
const GLenum min_filter = c->textures.tmu[i].texture->min_filter;
|
|
if (ggl_unlikely(min_filter >= GL_NEAREST_MIPMAP_NEAREST)) {
|
|
int lod = compute_lod(c, i, s0, t0, s1, t1, s2, t2);
|
|
c->rasterizer.procs.bindTextureLod(c, i,
|
|
&c->textures.tmu[i].texture->mip(lod));
|
|
}
|
|
|
|
// premultiply (s,t) when clampling
|
|
if (tmu.s_wrap == GGL_CLAMP) {
|
|
const int width = tmu.surface.width;
|
|
s0 *= width;
|
|
s1 *= width;
|
|
s2 *= width;
|
|
}
|
|
if (tmu.t_wrap == GGL_CLAMP) {
|
|
const int height = tmu.surface.height;
|
|
t0 *= height;
|
|
t1 *= height;
|
|
t2 *= height;
|
|
}
|
|
|
|
s0 = gglMulx(s0, w0, wscale);
|
|
t0 = gglMulx(t0, w0, wscale);
|
|
s1 = gglMulx(s1, w1, wscale);
|
|
t1 = gglMulx(t1, w1, wscale);
|
|
s2 = gglMulx(s2, w2, wscale);
|
|
t2 = gglMulx(t2, w2, wscale);
|
|
|
|
itt[6] = sc - lerp.iteratorsScale(itt+0, s0, s1, s2);
|
|
itt[7] = sc - lerp.iteratorsScale(itt+3, t0, t1, t2);
|
|
c->rasterizer.procs.texCoordGradScale8xv(c, i, itt);
|
|
}
|
|
}
|
|
|
|
|
|
static inline
|
|
bool cull_triangle(ogles_context_t* c, vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
if (ggl_likely(c->cull.enable)) {
|
|
const GLenum winding = (c->lerp.area() > 0) ? GL_CW : GL_CCW;
|
|
const GLenum face = (winding == c->cull.frontFace) ? GL_FRONT : GL_BACK;
|
|
if (face == c->cull.cullFace)
|
|
return true; // culled!
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static inline
|
|
GLfixed frustumPlaneDist(int plane, const vec4_t& s)
|
|
{
|
|
const GLfixed d = s.v[ plane >> 1 ];
|
|
return ((plane & 1) ? (s.w - d) : (s.w + d));
|
|
}
|
|
|
|
static inline
|
|
int32_t clipDivide(GLfixed a, GLfixed b) {
|
|
// returns a 4.28 fixed-point
|
|
return gglMulDivi(1LU<<28, a, b);
|
|
}
|
|
|
|
void clip_triangle(ogles_context_t* c,
|
|
vertex_t* v0, vertex_t* v1, vertex_t* v2)
|
|
{
|
|
uint32_t all_cc = (v0->flags | v1->flags | v2->flags) & vertex_t::CLIP_ALL;
|
|
|
|
vertex_t *p0, *p1, *p2;
|
|
const int MAX_CLIPPING_PLANES = 6 + OGLES_MAX_CLIP_PLANES;
|
|
const int MAX_VERTICES = 3;
|
|
|
|
// Temporary buffer to hold the new vertices. Each plane can add up to
|
|
// two new vertices (because the polygon is convex).
|
|
// We need one extra element, to handle an overflow case when
|
|
// the polygon degenerates into something non convex.
|
|
vertex_t buffer[MAX_CLIPPING_PLANES * 2 + 1]; // ~3KB
|
|
vertex_t* buf = buffer;
|
|
|
|
// original list of vertices (polygon to clip, in fact this
|
|
// function works with an arbitrary polygon).
|
|
vertex_t* in[3] = { v0, v1, v2 };
|
|
|
|
// output lists (we need 2, which we use back and forth)
|
|
// (maximum outpout list's size is MAX_CLIPPING_PLANES + MAX_VERTICES)
|
|
// 2 more elements for overflow when non convex polygons.
|
|
vertex_t* out[2][MAX_CLIPPING_PLANES + MAX_VERTICES + 2];
|
|
unsigned int outi = 0;
|
|
|
|
// current input list
|
|
vertex_t** ivl = in;
|
|
|
|
// 3 input vertices, 0 in the output list, first plane
|
|
unsigned int ic = 3;
|
|
|
|
// User clip-planes first, the clipping is always done in eye-coordinate
|
|
// this is basically the same algorithm than for the view-volume
|
|
// clipping, except for the computation of the distance (vertex, plane)
|
|
// and the fact that we need to compute the eye-coordinates of each
|
|
// new vertex we create.
|
|
|
|
if (ggl_unlikely(all_cc & vertex_t::USER_CLIP_ALL))
|
|
{
|
|
unsigned int plane = 0;
|
|
uint32_t cc = (all_cc & vertex_t::USER_CLIP_ALL) >> 8;
|
|
do {
|
|
if (cc & 1) {
|
|
// pointers to our output list (head and current)
|
|
vertex_t** const ovl = &out[outi][0];
|
|
vertex_t** output = ovl;
|
|
unsigned int oc = 0;
|
|
unsigned int sentinel = 0;
|
|
// previous vertex, compute distance to the plane
|
|
vertex_t* s = ivl[ic-1];
|
|
const vec4_t& equation = c->clipPlanes.plane[plane].equation;
|
|
GLfixed sd = dot4(equation.v, s->eye.v);
|
|
// clip each vertex against this plane...
|
|
for (unsigned int i=0 ; i<ic ; i++) {
|
|
vertex_t* p = ivl[i];
|
|
const GLfixed pd = dot4(equation.v, p->eye.v);
|
|
if (sd >= 0) {
|
|
if (pd >= 0) {
|
|
// both inside
|
|
*output++ = p;
|
|
oc++;
|
|
} else {
|
|
// s inside, p outside (exiting)
|
|
const GLfixed t = clipDivide(sd, sd-pd);
|
|
c->arrays.clipEye(c, buf, t, p, s);
|
|
*output++ = buf++;
|
|
oc++;
|
|
if (++sentinel >= 3)
|
|
return; // non-convex polygon!
|
|
}
|
|
} else {
|
|
if (pd >= 0) {
|
|
// s outside (entering)
|
|
if (pd) {
|
|
const GLfixed t = clipDivide(pd, pd-sd);
|
|
c->arrays.clipEye(c, buf, t, s, p);
|
|
*output++ = buf++;
|
|
oc++;
|
|
if (++sentinel >= 3)
|
|
return; // non-convex polygon!
|
|
}
|
|
*output++ = p;
|
|
oc++;
|
|
} else {
|
|
// both outside
|
|
}
|
|
}
|
|
s = p;
|
|
sd = pd;
|
|
}
|
|
// output list become the new input list
|
|
if (oc<3)
|
|
return; // less than 3 vertices left? we're done!
|
|
ivl = ovl;
|
|
ic = oc;
|
|
outi = 1-outi;
|
|
}
|
|
cc >>= 1;
|
|
plane++;
|
|
} while (cc);
|
|
}
|
|
|
|
// frustum clip-planes
|
|
if (all_cc & vertex_t::FRUSTUM_CLIP_ALL)
|
|
{
|
|
unsigned int plane = 0;
|
|
uint32_t cc = all_cc & vertex_t::FRUSTUM_CLIP_ALL;
|
|
do {
|
|
if (cc & 1) {
|
|
// pointers to our output list (head and current)
|
|
vertex_t** const ovl = &out[outi][0];
|
|
vertex_t** output = ovl;
|
|
unsigned int oc = 0;
|
|
unsigned int sentinel = 0;
|
|
// previous vertex, compute distance to the plane
|
|
vertex_t* s = ivl[ic-1];
|
|
GLfixed sd = frustumPlaneDist(plane, s->clip);
|
|
// clip each vertex against this plane...
|
|
for (unsigned int i=0 ; i<ic ; i++) {
|
|
vertex_t* p = ivl[i];
|
|
const GLfixed pd = frustumPlaneDist(plane, p->clip);
|
|
if (sd >= 0) {
|
|
if (pd >= 0) {
|
|
// both inside
|
|
*output++ = p;
|
|
oc++;
|
|
} else {
|
|
// s inside, p outside (exiting)
|
|
const GLfixed t = clipDivide(sd, sd-pd);
|
|
c->arrays.clipVertex(c, buf, t, p, s);
|
|
*output++ = buf++;
|
|
oc++;
|
|
if (++sentinel >= 3)
|
|
return; // non-convex polygon!
|
|
}
|
|
} else {
|
|
if (pd >= 0) {
|
|
// s outside (entering)
|
|
if (pd) {
|
|
const GLfixed t = clipDivide(pd, pd-sd);
|
|
c->arrays.clipVertex(c, buf, t, s, p);
|
|
*output++ = buf++;
|
|
oc++;
|
|
if (++sentinel >= 3)
|
|
return; // non-convex polygon!
|
|
}
|
|
*output++ = p;
|
|
oc++;
|
|
} else {
|
|
// both outside
|
|
}
|
|
}
|
|
s = p;
|
|
sd = pd;
|
|
}
|
|
// output list become the new input list
|
|
if (oc<3)
|
|
return; // less than 3 vertices left? we're done!
|
|
ivl = ovl;
|
|
ic = oc;
|
|
outi = 1-outi;
|
|
}
|
|
cc >>= 1;
|
|
plane++;
|
|
} while (cc);
|
|
}
|
|
|
|
// finally we can render our triangles...
|
|
p0 = ivl[0];
|
|
p1 = ivl[1];
|
|
for (unsigned int i=2 ; i<ic ; i++) {
|
|
p2 = ivl[i];
|
|
c->lerp.initTriangle(p0, p1, p2);
|
|
if (cull_triangle(c, p0, p1, p2)) {
|
|
p1 = p2;
|
|
continue; // culled!
|
|
}
|
|
triangle(c, p0, p1, p2);
|
|
p1 = p2;
|
|
}
|
|
}
|
|
|
|
unsigned int clip_line(ogles_context_t* c, vertex_t* s, vertex_t* p)
|
|
{
|
|
const uint32_t all_cc = (s->flags | p->flags) & vertex_t::CLIP_ALL;
|
|
|
|
if (ggl_unlikely(all_cc & vertex_t::USER_CLIP_ALL))
|
|
{
|
|
unsigned int plane = 0;
|
|
uint32_t cc = (all_cc & vertex_t::USER_CLIP_ALL) >> 8;
|
|
do {
|
|
if (cc & 1) {
|
|
const vec4_t& equation = c->clipPlanes.plane[plane].equation;
|
|
const GLfixed sd = dot4(equation.v, s->eye.v);
|
|
const GLfixed pd = dot4(equation.v, p->eye.v);
|
|
if (sd >= 0) {
|
|
if (pd >= 0) {
|
|
// both inside
|
|
} else {
|
|
// s inside, p outside (exiting)
|
|
const GLfixed t = clipDivide(sd, sd-pd);
|
|
c->arrays.clipEye(c, p, t, p, s);
|
|
}
|
|
} else {
|
|
if (pd >= 0) {
|
|
// s outside (entering)
|
|
if (pd) {
|
|
const GLfixed t = clipDivide(pd, pd-sd);
|
|
c->arrays.clipEye(c, s, t, s, p);
|
|
}
|
|
} else {
|
|
// both outside
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
cc >>= 1;
|
|
plane++;
|
|
} while (cc);
|
|
}
|
|
|
|
// frustum clip-planes
|
|
if (all_cc & vertex_t::FRUSTUM_CLIP_ALL)
|
|
{
|
|
unsigned int plane = 0;
|
|
uint32_t cc = all_cc & vertex_t::FRUSTUM_CLIP_ALL;
|
|
do {
|
|
if (cc & 1) {
|
|
const GLfixed sd = frustumPlaneDist(plane, s->clip);
|
|
const GLfixed pd = frustumPlaneDist(plane, p->clip);
|
|
if (sd >= 0) {
|
|
if (pd >= 0) {
|
|
// both inside
|
|
} else {
|
|
// s inside, p outside (exiting)
|
|
const GLfixed t = clipDivide(sd, sd-pd);
|
|
c->arrays.clipVertex(c, p, t, p, s);
|
|
}
|
|
} else {
|
|
if (pd >= 0) {
|
|
// s outside (entering)
|
|
if (pd) {
|
|
const GLfixed t = clipDivide(pd, pd-sd);
|
|
c->arrays.clipVertex(c, s, t, s, p);
|
|
}
|
|
} else {
|
|
// both outside
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
cc >>= 1;
|
|
plane++;
|
|
} while (cc);
|
|
}
|
|
|
|
return 2;
|
|
}
|
|
|
|
|
|
}; // namespace android
|