875d8e1323
this is the first step to add support for GLES 2.x, this change breaks the dependency of SF on GLES 1.x by moving all operation into their own class. Bug: 8679321 Change-Id: I0d2741eca2cefe67dfd9cf837cac10c4d126928b
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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* Copyright 2013 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 <GLES/gl.h>
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#include <cutils/compiler.h>
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#include "GLES10RenderEngine.h"
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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GLES10RenderEngine::~GLES10RenderEngine() {
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}
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void GLES10RenderEngine::setupLayerBlending(
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bool premultipliedAlpha, bool opaque, int alpha) {
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// OpenGL ES 1.0 doesn't support texture combiners.
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// This path doesn't properly handle opaque layers that have non-opaque
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// alpha values. The alpha channel will be copied into the framebuffer or
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// screenshot, so if the framebuffer or screenshot is blended on top of
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// something else, whatever is below the window will incorrectly show
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// through.
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if (CC_UNLIKELY(alpha < 0xFF)) {
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GLfloat floatAlpha = alpha * (1.0f / 255.0f);
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if (premultipliedAlpha) {
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glColor4f(floatAlpha, floatAlpha, floatAlpha, floatAlpha);
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} else {
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glColor4f(1.0f, 1.0f, 1.0f, floatAlpha);
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}
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glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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} else {
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glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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}
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if (alpha < 0xFF || !opaque) {
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glEnable(GL_BLEND);
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glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
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GL_ONE_MINUS_SRC_ALPHA);
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} else {
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glDisable(GL_BLEND);
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}
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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// ---------------------------------------------------------------------------
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