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#include "ofxGpuLutBlend.h"
/*
ofxGpuLutBlend::ofxGpuLutBlend(){}
ofxGpuLutBlend::~ofxGpuLutBlend(){}
void ofxGpuLutBlend::load(ofTexture lutTexture){
if(ofIsGLProgrammableRenderer()){
vertexShader = "#version 150\n";
vertexShader += STRINGIFY(
uniform mat4 projectionMatrix;
uniform mat4 modelViewMatrix;
uniform mat4 modelViewProjectionMatrix;
in vec4 position;
in vec2 texcoord;
out vec2 texCoordVarying;
void main()
{
texCoordVarying = texcoord;
gl_Position = modelViewProjectionMatrix * position;
}
);
fragmentShader = "#version 150\n";
fragmentShader += STRINGIFY(
uniform sampler2DRect tex;
uniform sampler2DRect lut;
uniform float blend;
uniform float size = 64.0;
in vec2 texCoordVarying;
out vec4 fragColor;
// Texture coordinates
vec2 texcoord0 = texCoordVarying;
void main( void )
{
vec3 rawColor = texture(tex, texcoord0).rgb;
//float rawAlpha = texture(tex, texcoord0).a;
if (blend <= 0.0) {
fragColor = vec4(rawColor, 0.0);
}
else {
vec3 originalColor = floor(texture(tex, texcoord0).rgb * vec3(size - 1.0));
vec2 blueIndex = vec2(mod(originalColor.b, sqrt(size)), floor(originalColor.b / sqrt(size)));
vec2 index = vec2((size * blueIndex.x + originalColor.r) + 0.5, (size * blueIndex.y + originalColor.g) + 0.5);
fragColor = vec4(texture(lut, index).rgb, blend);
}
}
);
lutShader.setupShaderFromSource(GL_VERTEX_SHADER, vertexShader);
lutShader.setupShaderFromSource(GL_FRAGMENT_SHADER, fragmentShader);
lutShader.bindDefaults();
lutShader.linkProgram();
}
else {
fragmentShader = "#version 120\n#extension GL_ARB_texture_rectangle : enable\n";
fragmentShader += STRINGIFY(
uniform sampler2DRect tex;
uniform sampler2DRect lut;
uniform float blend;
uniform float size = 64.0;
void main( void )
{
vec3 rawColor = texture2DRect(tex, gl_TexCoord[0].st).rgb;
//float rawAlpha = texture2DRect(tex, gl_TexCoord[0].st).a;
if (blend <= 0.0) {
gl_FragColor = vec4(rawColor, 0.0);
}
else {
vec3 originalColor = floor(texture2DRect(tex, gl_TexCoord[0].st).rgb * vec3(size - 1.0));
vec2 blueIndex = vec2(mod(originalColor.b, sqrt(size)), floor(originalColor.b / sqrt(size)));
vec2 index = vec2((size * blueIndex.x + originalColor.r) + 0.5, (size * blueIndex.y + originalColor.g) + 0.5);
gl_FragColor = vec4(texture2DRect(lut, index).rgb, blend);
}
}
);
lutShader.unload();
lutShader.setupShaderFromSource(GL_FRAGMENT_SHADER, fragmentShader);
lutShader.linkProgram();
}
lut.setTextureWrap(GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
lut.setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
if(!ofGetUsingArbTex()){
ofEnableArbTex();
lut = lutTexture;
ofDisableArbTex();
}else{
lut = lutTexture;
}
blendAmt=1.0f;
}
void ofxGpuLutBlend::setBlend(float amt){
blendAmt=amt;
}
void ofxGpuLutBlend::load(ofImage lutImage){
load(lutImage.getTexture());
}
void ofxGpuLutBlend::load(string path){
lutImage.load(path);
load(lutImage.getTexture());
}
void ofxGpuLutBlend::begin(){
lutShader.begin();
lutShader.setUniformTexture("lut", lut, 1);
lutShader.setUniform1f("blend", blendAmt);
lutShader.setUniform1f("size", 256.0f);
}
void ofxGpuLutBlend::end(){
lutShader.end();
}
ofImage oldMakeLut(float gamma,float pedestal,float clamp){
ofImage image;
image.allocate(512,512,OF_IMAGE_COLOR);
uint8_t *pixels=&image.getPixels()[0];
if (gamma<=0.0f){
memset(pixels,0,image.getWidth()*image.getHeight()*3);
}
else {
for (uint32_t b=0;b<64;b++){
uint32_t bluecolumn=b%8;
uint32_t bluerow=b>>3;
for (uint32_t g=0;g<64;g++){
for (uint32_t r=0;r<64;r++){
uint8_t *pixel=&pixels[(r+(g<<9)+(bluecolumn<<6)+(bluerow<<15))*3]; //+(b<<12))*3];
pixel[0]=(uint8_t)((pedestal+(pow(r/64.0f,1.0f/gamma)*(clamp-pedestal)))*255);
pixel[1]=(uint8_t)((pedestal+(pow(g/64.0f,1.0f/gamma)*(clamp-pedestal)))*255);
pixel[2]=(uint8_t)((pedestal+(pow(b/64.0f,1.0f/gamma)*(clamp-pedestal)))*255);
}
}
}
}
//image.update();
return image;
}
ofImage simpleMakeLut(float gamma,float pedestal,float clamp,int mapWidthBits){
ofImage image;
int mapWidth=pow(2,mapWidthBits);
int mapDimensionBits=(mapWidthBits*3)/2; //only works if mapWidthBits is even
int mapDimension=pow(2,mapDimensionBits);
image.allocate(mapDimension,mapDimension,OF_IMAGE_COLOR);
uint8_t *pixels=&image.getPixels()[0];
int numpixels=image.getWidth()*image.getHeight();
for (uint32_t b=0;b<mapWidth;b++){
uint32_t bluecolumn=b%((int)pow(2,mapWidthBits/2));
uint32_t bluerow=b>>(mapWidthBits/2);
if (gamma==0.0f){
memset(pixels,0,numpixels*4);
}
for (uint32_t g=0;g<mapWidth;g++){
for (uint32_t r=0;r<mapWidth;r++){
uint8_t *pixel=&pixels[(r+(g<<mapDimensionBits)+(bluecolumn<<mapWidthBits)+(bluerow<<(mapDimensionBits+mapWidthBits)))*3];
pixel[0]=(uint8_t)((pedestal+(pow(((float)r)/mapWidth,gamma)*(clamp-pedestal)))*255);
pixel[1]=(uint8_t)((pedestal+(pow(((float)g)/mapWidth,gamma)*(clamp-pedestal)))*255);
pixel[2]=(uint8_t)((pedestal+(pow(((float)b)/mapWidth,gamma)*(clamp-pedestal)))*255);
}
}
}
ofLog()<<"Created LUT: "<<numpixels<<" pixels";
//image.update();
return image;
}
ofImage makeLut(float gamma,float pedestal,float clamp,int mapWidthBits){
//attempt to optimise: starting 2.5fps @ 16mp
//loop optimisation of gpixel and bPixel make us nothing
ofImage image;
int mapWidth=pow(2,mapWidthBits);
int mapDimensionBits=(mapWidthBits*3)/2; //only works if mapWidthBits is even
int mapDimension=pow(2,mapDimensionBits);
image.allocate(mapDimension,mapDimension,OF_IMAGE_COLOR);
uint8_t *pixels=&image.getPixels()[0];
int numpixels=image.getWidth()*image.getHeight();
for (uint32_t b=0;b<mapWidth;b++){
uint32_t bluecolumn=b%((int)pow(2,mapWidthBits/2));
uint32_t bluerow=b>>(mapWidthBits/2);
uint8_t bPixel=(uint8_t)((pedestal+(pow(((float)b)/mapWidth,gamma)*(clamp-pedestal)))*255);
if (gamma==0.0f){
memset(pixels,0,numpixels*4);
}
for (uint32_t g=0;g<mapWidth;g++){
uint8_t gPixel=(uint8_t)((pedestal+(pow(((float)g)/mapWidth,gamma)*(clamp-pedestal)))*255);
for (uint32_t r=0;r<mapWidth;r++){
uint8_t *pixel=&pixels[(r+(g<<mapDimensionBits)+(bluecolumn<<mapWidthBits)+(bluerow<<(mapDimensionBits+mapWidthBits)))*3];
pixel[0]=(uint8_t)((pedestal+(pow(((float)r)/mapWidth,gamma)*(clamp-pedestal)))*255);
pixel[1]=gPixel;
pixel[2]=bPixel;
}
}
}
ofLog()<<"Created LUT: "<<numpixels<<" pixels";
//image.update();
return image;
}
*/
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