rts_glIntegrateTexture.h
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/*This class performs integration across a series of rectangular
texture samples. Basically, this is a downsample using a large box
filter and can be used to sum the results of multiple calculations
that are combined in a single texture.*/
#include "rts_glRenderToTexture.h"
#include "rts_glShaderProgram.h"
#define MEAN 0
#define SUM 1
#define MIN 2
#define MAX 3
class rts_glIntegrateTexture
{
private:
int x_sample_size;
int y_sample_size;
int x_sample_num;
int y_sample_num;
rts_glShaderProgram x_pass_mean;
rts_glShaderProgram y_pass_mean;
rts_glShaderProgram x_pass_min;
rts_glShaderProgram y_pass_min;
rts_glShaderProgram x_pass_max;
rts_glShaderProgram y_pass_max;
//this is a two-pass downsample
rts_glRenderToTexture x_pass;
rts_glRenderToTexture y_pass;
void initialize_shaders();
inline void x_pass_enable(int type, rts_glTextureMap texture);
inline void x_pass_disable(int type);
inline void y_pass_enable(int type);
inline void y_pass_disable(int type);
public:
//initialize the integrator with the number and size of samples
void Init(int x_size, int y_size,
int samples_x, int samples_y,
rts_glTextureMap test);
void Integrate(float* result, rts_glTextureMap texture, int type = MEAN);
rts_glTextureMap getResultTexture(){return y_pass.GetTexture(0);}
};
void rts_glIntegrateTexture::initialize_shaders()
{
//load and initialize the integration shaders
x_pass_mean.AttachShader(GL_FRAGMENT_SHADER,
"x_pass_mean.glsl");
x_pass_mean.Compile();
x_pass_mean.Link();
cout<<"x_pass_mean.glsl"<<endl;
x_pass_mean.PrintLog();
//x_pass_program.AttachTextureMap("difference_tex",
// test);
x_pass_mean.AttachGlobalUniform("templatesize", &x_sample_size);
y_pass_mean.AttachShader(GL_FRAGMENT_SHADER,
"y_pass_mean.glsl");
y_pass_mean.Compile();
y_pass_mean.Link();
cout<<"y_pass_mean.glsl"<<endl;
y_pass_mean.PrintLog();
y_pass_mean.AttachTextureMap("xfunnel_tex",
x_pass.GetTexture(0));
y_pass_mean.AttachGlobalUniform("templatesize", &x_sample_size);
}
void rts_glIntegrateTexture::x_pass_enable(int type, rts_glTextureMap texture)
{
x_pass_mean.BeginProgram();
x_pass_mean.AttachTextureMap("difference_tex",
texture);
x_pass_mean.UpdateGlobalUniforms();
}
void rts_glIntegrateTexture::x_pass_disable(int type)
{
x_pass_mean.EndProgram();
}
void rts_glIntegrateTexture::y_pass_enable(int type)
{
y_pass_mean.BeginProgram();
y_pass_mean.UpdateGlobalUniforms();
}
void rts_glIntegrateTexture::y_pass_disable(int type)
{
y_pass_mean.EndProgram();
}
void rts_glIntegrateTexture::Init(int x_size, int y_size,
int samples_x, int samples_y,
rts_glTextureMap test)
{
//set provate variables
x_sample_size = x_size;
y_sample_size = y_size;
x_sample_num = samples_x;
y_sample_num = samples_y;
//initialize the integrator texture maps
x_pass.Init(x_sample_num, y_sample_num*y_sample_size);
x_pass.AddTexture(GL_TEXTURE_RECTANGLE_ARB, GL_RGBA32F_ARB, GL_RGBA, GL_FLOAT);
y_pass.Init(x_sample_num, y_sample_num);
y_pass.AddTexture(GL_TEXTURE_RECTANGLE_ARB, GL_RGBA32F_ARB, GL_RGBA, GL_FLOAT);
initialize_shaders();
}
void rts_glIntegrateTexture::Integrate(float* result, rts_glTextureMap texture, int type)
{
x_pass.BeginRender(0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
x_pass.UseMaxViewport();
gluOrtho2D(0.0, 1.0, 0.0, 1.0);
x_pass_enable(MEAN, texture);
int total_w = x_sample_size * x_sample_num;
int total_h = y_sample_size * y_sample_num;
//GLint prog;
//glGetIntegerv(GL_CURRENT_PROGRAM, &prog);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0);
glTexCoord2f(total_w, 0.0); glVertex2f(1.0, 0.0);
glTexCoord2f(total_w, total_h); glVertex2f(1.0, 1.0);
glTexCoord2f(0.0, total_h); glVertex2f(0.0, 1.0);
glEnd();
x_pass_disable(MEAN);
glFinish();
x_pass.EndRender();
//funnel along Y
y_pass.BeginRender(0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
y_pass.UseMaxViewport();
gluOrtho2D(0.0, 1.0, 0.0, 1.0);
//glColor3f(1.0, 0.0, 0.0);
y_pass_enable(type);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0);
glTexCoord2f(x_sample_num, 0.0); glVertex2f(1.0, 0.0);
glTexCoord2f(x_sample_num, total_h); glVertex2f(1.0, 1.0);
glTexCoord2f(0.0, total_h); glVertex2f(0.0, 1.0);
glEnd();
int fb;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &fb);
y_pass_disable(type);
y_pass.EndRender();
y_pass.GetTexture(0).BeginTexture();
glGetTexImage(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, GL_FLOAT, result);
y_pass.GetTexture(0).EndTexture();
}