Gut jetzt habe ich zwar alles so geändert wie ihr es vorgeschlagen habt, jedoch erwarte ich das in der Textur die Werte aus dem Cg Shader drin stehen. Ich habe ein Cg shader welches als Output lediglich return float4(2.2, 2.3, 3.5, 1.5) rausgibt. Ich wollte lediglich mit diesem Code testen ob sich floating points in texturen abspeichern lassen und diese dann rauslesen. Leider bekomme ich halt nur immer die nuller heraus.
Danke
Hier der ganze source meiner Klasse:
#pragma once
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <gl/glew.h>
#include <cg/cgGL.h>
#include <Cg/cg.h>
#include <math.h>
#define M_PI 3.14159265358979323846
static GLfloat PixelArray[512][512][4];
class clCgBasis{
public:
clCgBasis(void)
{
};
clCgBasis(int SizeX, int SizeY, CGprofile Profile, CGcontext Context, const char *FileName)
{
FSizeX = SizeX;
FSizeY = SizeY;
FFileName = FileName;
FIntTexture = 0;
FContext = Context;
FProfile = Profile;
FTxtParam = NULL;
FragmentProgram = NULL;
if (Init() != true)
printf("Error during calling 'Init()' in class clCgBasis\n");
};
virtual ~clCgBasis(void)
{
cgDestroyProgram(FragmentProgram);
};
// abstract methods must be inherited by descendent class!
virtual bool Update(void)
{
// Bind the filtered texture
glBindTexture(GL_TEXTURE_RECTANGLE_NV, this->FIntTexture);
glEnable(GL_TEXTURE_RECTANGLE_NV);
// render a full-screen quad textured with the results of our
// computation. Note that this is not part of the computation: this
// is only the visualization of the results.
glBegin(GL_QUADS);
{
glTexCoord2f(0, 0); glVertex3f(-1, -1, -0.5f);
glTexCoord2f(1, 0); glVertex3f( 1, -1, -0.5f);
glTexCoord2f(1, 1); glVertex3f( 1, 1, -0.5f);
glTexCoord2f(0, 1); glVertex3f(-1, 1, -0.5f);
}
glEnd();
glDisable(GL_TEXTURE_RECTANGLE_NV);
return true;
};
virtual bool Display(void)
{
int vp[4];
glGetIntegerv(GL_VIEWPORT, vp);
glViewport(0, 0, this->FSizeX, this->FSizeY);
glBindTexture(GL_TEXTURE_RECTANGLE_NV, this->FIntTexture);
glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_NV, 0, 0, 0, 0, 0, this->FSizeX, this->FSizeY);
cgGLBindProgram(this->FragmentProgram);
cgGLEnableProfile(this->FProfile);
cgGLSetTextureParameter(this->FTxtParam, this->FIntTexture);
cgGLEnableTextureParameter(this->FTxtParam);
glBegin(GL_QUADS);
{
glTexCoord2f(0, 0); glVertex3f(-1, -1, -0.5f);
glTexCoord2f(1, 0); glVertex3f( 1, -1, -0.5f);
glTexCoord2f(1, 1); glVertex3f( 1, 1, -0.5f);
glTexCoord2f(0, 1); glVertex3f(-1, 1, -0.5f);
}
glEnd();
cgGLDisableTextureParameter(this->FTxtParam);
cgGLDisableProfile(this->FProfile);
glBindTexture(GL_TEXTURE_RECTANGLE_NV, this->FIntTexture);
glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_NV, 0, 0, 0, 0, 0, this->FSizeX, this->FSizeY);
glViewport(vp[0], vp[1], vp[2], vp[3]);
return true;
};
virtual unsigned int GetTexture(){return FIntTexture;};
virtual CGcontext GetContext(){return FContext;};
virtual CGprofile GetProfile(){return FProfile;};
virtual void GetPixels(int i,int j, int k)
{
glBindTexture(GL_TEXTURE_RECTANGLE_NV, this->FIntTexture);
glGetTexImage(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGBA, GL_FLOAT, PixelArray);
printf("%f\n", PixelArray[i][j][k]);
}
protected:
virtual bool LoadCgProgram()
{
FragmentProgram = cgCreateProgramFromFile(FContext, CG_SOURCE,
FFileName, FProfile,
NULL, NULL);
if(FragmentProgram != NULL)
{
cgGLLoadProgram(FragmentProgram);
FTxtParam = cgGetNamedParameter(FragmentProgram, "texture");
return true;
}
return false;
};
virtual bool Init()
{
if (LoadCgProgram() != true)
return false;
else
{
glGenTextures(1, &FIntTexture);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, FSizeX, FSizeY, 0, GL_RGBA, GL_FLOAT, NULL);
glEnable(GL_TEXTURE_RECTANGLE_NV);
return true;
}
};
CGprogram FragmentProgram; // the fragment program used to update
CGparameter FTxtParam; // a parameter to the fragment program
CGprofile FProfile;
CGcontext FContext;
int FSizeX;
int FSizeY;
unsigned int FIntTexture; // The texture used as a data array
private:
const char *FFileName;
};