62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
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/*
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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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