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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "OpenGLRenderer"
#include "Caches.h"
namespace android {
#ifdef USE_OPENGL_RENDERER
using namespace uirenderer;
ANDROID_SINGLETON_STATIC_INSTANCE(Caches);
#endif
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
Caches::Caches(): Singleton<Caches>(), blend(false), lastSrcMode(GL_ZERO),
lastDstMode(GL_ZERO), currentProgram(NULL) {
GLint maxTextureUnits;
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
if (maxTextureUnits < REQUIRED_TEXTURE_UNITS_COUNT) {
LOGW("At least %d texture units are required!", REQUIRED_TEXTURE_UNITS_COUNT);
}
glGenBuffers(1, &meshBuffer);
glBindBuffer(GL_ARRAY_BUFFER, meshBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(gMeshVertices), gMeshVertices, GL_STATIC_DRAW);
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
mCurrentBuffer = meshBuffer;
mRegionMesh = NULL;
}
Caches::~Caches() {
delete[] mRegionMesh;
}
///////////////////////////////////////////////////////////////////////////////
// VBO
///////////////////////////////////////////////////////////////////////////////
void Caches::bindMeshBuffer() {
bindMeshBuffer(meshBuffer);
}
void Caches::bindMeshBuffer(const GLuint buffer) {
if (mCurrentBuffer != buffer) {
glBindBuffer(GL_ARRAY_BUFFER, buffer);
mCurrentBuffer = buffer;
}
}
void Caches::unbindMeshBuffer() {
if (mCurrentBuffer) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
mCurrentBuffer = 0;
}
}
TextureVertex* Caches::getRegionMesh() {
// Create the mesh, 2 triangles and 4 vertices per rectangle in the region
if (!mRegionMesh) {
mRegionMesh = new TextureVertex[REGION_MESH_QUAD_COUNT * 4];
uint16_t* regionIndices = new uint16_t[REGION_MESH_QUAD_COUNT * 6];
for (int i = 0; i < REGION_MESH_QUAD_COUNT; i++) {
uint16_t quad = i * 4;
int index = i * 6;
regionIndices[index ] = quad; // top-left
regionIndices[index + 1] = quad + 1; // top-right
regionIndices[index + 2] = quad + 2; // bottom-left
regionIndices[index + 3] = quad + 2; // bottom-left
regionIndices[index + 4] = quad + 1; // top-right
regionIndices[index + 5] = quad + 3; // bottom-right
}
glGenBuffers(1, &mRegionMeshIndices);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mRegionMeshIndices);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, REGION_MESH_QUAD_COUNT * 6 * sizeof(uint16_t),
regionIndices, GL_STATIC_DRAW);
delete[] regionIndices;
} else {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mRegionMeshIndices);
}
return mRegionMesh;
}
}; // namespace uirenderer
}; // namespace android
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