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/*Gluint
* Copyright 2013 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 <stdint.h>
#include <log/log.h>
#include "Program.h"
#include "ProgramCache.h"
#include "Description.h"
#include <utils/String8.h>
namespace android {
Program::Program(const ProgramCache::Key& /*needs*/, const char* vertex, const char* fragment)
: mInitialized(false) {
GLuint vertexId = buildShader(vertex, GL_VERTEX_SHADER);
GLuint fragmentId = buildShader(fragment, GL_FRAGMENT_SHADER);
GLuint programId = glCreateProgram();
glAttachShader(programId, vertexId);
glAttachShader(programId, fragmentId);
glBindAttribLocation(programId, position, "position");
glBindAttribLocation(programId, texCoords, "texCoords");
glLinkProgram(programId);
GLint status;
glGetProgramiv(programId, GL_LINK_STATUS, &status);
if (status != GL_TRUE) {
ALOGE("Error while linking shaders:");
GLint infoLen = 0;
glGetProgramiv(programId, GL_INFO_LOG_LENGTH, &infoLen);
if (infoLen > 1) {
GLchar log[infoLen];
glGetProgramInfoLog(programId, infoLen, 0, &log[0]);
ALOGE("%s", log);
}
glDetachShader(programId, vertexId);
glDetachShader(programId, fragmentId);
glDeleteShader(vertexId);
glDeleteShader(fragmentId);
glDeleteProgram(programId);
} else {
mProgram = programId;
mVertexShader = vertexId;
mFragmentShader = fragmentId;
mInitialized = true;
mColorMatrixLoc = glGetUniformLocation(programId, "colorMatrix");
mProjectionMatrixLoc = glGetUniformLocation(programId, "projection");
mTextureMatrixLoc = glGetUniformLocation(programId, "texture");
mSamplerLoc = glGetUniformLocation(programId, "sampler");
mColorLoc = glGetUniformLocation(programId, "color");
mAlphaPlaneLoc = glGetUniformLocation(programId, "alphaPlane");
// set-up the default values for our uniforms
glUseProgram(programId);
const GLfloat m[16] = {1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1 };
glUniformMatrix4fv(mProjectionMatrixLoc, 1, GL_FALSE, m);
glEnableVertexAttribArray(0);
}
}
Program::~Program() {
}
bool Program::isValid() const {
return mInitialized;
}
void Program::use() {
glUseProgram(mProgram);
}
GLuint Program::getAttrib(const char* name) const {
// TODO: maybe use a local cache
return glGetAttribLocation(mProgram, name);
}
GLint Program::getUniform(const char* name) const {
// TODO: maybe use a local cache
return glGetUniformLocation(mProgram, name);
}
GLuint Program::buildShader(const char* source, GLenum type) {
GLuint shader = glCreateShader(type);
glShaderSource(shader, 1, &source, 0);
glCompileShader(shader);
GLint status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status != GL_TRUE) {
// Some drivers return wrong values for GL_INFO_LOG_LENGTH
// use a fixed size instead
GLchar log[512];
glGetShaderInfoLog(shader, sizeof(log), 0, log);
ALOGE("Error while compiling shader: \n%s\n%s", source, log);
glDeleteShader(shader);
return 0;
}
return shader;
}
String8& Program::dumpShader(String8& result, GLenum /*type*/) {
GLuint shader = GL_FRAGMENT_SHADER ? mFragmentShader : mVertexShader;
GLint l;
glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &l);
char* src = new char[l];
glGetShaderSource(shader, l, NULL, src);
result.append(src);
delete [] src;
return result;
}
void Program::setUniforms(const Description& desc) {
// TODO: we should have a mechanism here to not always reset uniforms that
// didn't change for this program.
if (mSamplerLoc >= 0) {
glUniform1i(mSamplerLoc, 0);
glUniformMatrix4fv(mTextureMatrixLoc, 1, GL_FALSE, desc.mTexture.getMatrix().asArray());
}
if (mAlphaPlaneLoc >= 0) {
glUniform1f(mAlphaPlaneLoc, desc.mPlaneAlpha);
}
if (mColorLoc >= 0) {
glUniform4fv(mColorLoc, 1, desc.mColor);
}
if (mColorMatrixLoc >= 0) {
glUniformMatrix4fv(mColorMatrixLoc, 1, GL_FALSE, desc.mColorMatrix.asArray());
}
// these uniforms are always present
glUniformMatrix4fv(mProjectionMatrixLoc, 1, GL_FALSE, desc.mProjectionMatrix.asArray());
}
} /* namespace android */
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