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/*
* Copyright (C) 2011 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.
*/
#include "WarpRenderer.h"
#include <GLES2/gl2ext.h>
const GLfloat g_vVertices[] = {
-1.f, 1.f, 0.0f, 1.0f, // Position 0
0.0f, 1.0f, // TexCoord 0
1.f, 1.f, 0.0f, 1.0f, // Position 1
1.0f, 1.0f, // TexCoord 1
-1.f, -1.f, 0.0f, 1.0f, // Position 2
0.0f, 0.0f, // TexCoord 2
1.f, -1.f, 0.0f, 1.0f, // Position 3
1.0f, 0.0f // TexCoord 3
};
const int VERTEX_STRIDE = 6 * sizeof(GLfloat);
GLushort g_iIndices[] = { 0, 1, 2, 3 };
WarpRenderer::WarpRenderer() : Renderer()
{
}
WarpRenderer::~WarpRenderer() {
}
void WarpRenderer::SetViewportMatrix(int w, int h, int W, int H)
{
for(int i=0; i<16; i++)
{
mViewportMatrix[i] = 0.0f;
}
mViewportMatrix[0] = float(w)/float(W);
mViewportMatrix[5] = float(h)/float(H);
mViewportMatrix[10] = 1.0f;
mViewportMatrix[12] = -1.0f + float(w)/float(W);
mViewportMatrix[13] = -1.0f + float(h)/float(H);
mViewportMatrix[15] = 1.0f;
}
void WarpRenderer::SetScalingMatrix(float xscale, float yscale)
{
for(int i=0; i<16; i++)
{
mScalingMatrix[i] = 0.0f;
}
mScalingMatrix[0] = xscale;
mScalingMatrix[5] = yscale;
mScalingMatrix[10] = 1.0f;
mScalingMatrix[15] = 1.0f;
}
bool WarpRenderer::InitializeGLProgram()
{
bool succeeded = false;
do {
GLuint glProgram;
glProgram = createProgram(VertexShaderSource(),
FragmentShaderSource());
if (!glProgram) {
break;
}
glUseProgram(glProgram);
if (!checkGlError("glUseProgram")) break;
// Get attribute locations
mPositionLoc = glGetAttribLocation(glProgram, "a_position");
mAffinetransLoc = glGetUniformLocation(glProgram, "u_affinetrans");
mViewporttransLoc = glGetUniformLocation(glProgram, "u_viewporttrans");
mScalingtransLoc = glGetUniformLocation(glProgram, "u_scalingtrans");
mTexCoordLoc = glGetAttribLocation(glProgram, "a_texCoord");
// Get sampler location
mSamplerLoc = glGetUniformLocation(glProgram, "s_texture");
mGlProgram = glProgram;
succeeded = true;
} while (false);
if (!succeeded && (mGlProgram != 0))
{
glDeleteProgram(mGlProgram);
checkGlError("glDeleteProgram");
mGlProgram = 0;
}
return succeeded;
}
bool WarpRenderer::DrawTexture(GLfloat *affine)
{
bool succeeded = false;
do {
bool rt = (mFrameBuffer == NULL)?
SetupGraphics(mSurfaceWidth, mSurfaceHeight) :
SetupGraphics(mFrameBuffer);
if(!rt)
break;
glDisable(GL_BLEND);
glActiveTexture(GL_TEXTURE0);
if (!checkGlError("glActiveTexture")) break;
const GLenum texture_type = InputTextureType();
glBindTexture(texture_type, mInputTextureName);
if (!checkGlError("glBindTexture")) break;
// Set the sampler texture unit to 0
glUniform1i(mSamplerLoc, 0);
// Load the vertex position
glVertexAttribPointer(mPositionLoc, 4, GL_FLOAT,
GL_FALSE, VERTEX_STRIDE, g_vVertices);
// Load the texture coordinate
glVertexAttribPointer(mTexCoordLoc, 2, GL_FLOAT,
GL_FALSE, VERTEX_STRIDE, &g_vVertices[4]);
glEnableVertexAttribArray(mPositionLoc);
glEnableVertexAttribArray(mTexCoordLoc);
// pass matrix information to the vertex shader
glUniformMatrix4fv(mAffinetransLoc, 1, GL_FALSE, affine);
glUniformMatrix4fv(mViewporttransLoc, 1, GL_FALSE, mViewportMatrix);
glUniformMatrix4fv(mScalingtransLoc, 1, GL_FALSE, mScalingMatrix);
// And, finally, execute the GL draw command.
glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_SHORT, g_iIndices);
checkGlError("glDrawElements");
glBindFramebuffer(GL_FRAMEBUFFER, 0);
succeeded = true;
} while (false);
return succeeded;
}
const char* WarpRenderer::VertexShaderSource() const
{
static const char gVertexShader[] =
"uniform mat4 u_affinetrans; \n"
"uniform mat4 u_viewporttrans; \n"
"uniform mat4 u_scalingtrans; \n"
"attribute vec4 a_position; \n"
"attribute vec2 a_texCoord; \n"
"varying vec2 v_texCoord; \n"
"void main() \n"
"{ \n"
" gl_Position = u_scalingtrans * u_viewporttrans * u_affinetrans * a_position; \n"
" v_texCoord = a_texCoord; \n"
"} \n";
return gVertexShader;
}
const char* WarpRenderer::FragmentShaderSource() const
{
static const char gFragmentShader[] =
"precision mediump float; \n"
"varying vec2 v_texCoord; \n"
"uniform sampler2D s_texture; \n"
"void main() \n"
"{ \n"
" vec4 color; \n"
" color = texture2D(s_texture, v_texCoord); \n"
" gl_FragColor = color; \n"
"} \n";
return gFragmentShader;
}
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