I have some elaborate code which gives a pretty result at the firest frame but then it disappears. Now, I isolated the problem and made a very small program to illustrate
this is my fragment shader
void rgbLightingFragmentProgram(
float4 position : TEXCOORD0,
float4 iPosition : TEXCOORD1,
float3 normal : TEXCOORD2,
float3 view : TEXCOORD3,
float3 refl : TEXCOORD4,
out float4 color : COLOR,
uniform sampler2D envmap)
{
float3 R = normalize(refl);
color = tex2Dlod(envmap,float4(R.x,R.y,0,9));
}
If I run the program it just draws a teapot rotated under angle 0, I use 2 keys to rotate in one of each directions hence drawing a new frame. Now the first frame looks a syou'd expect but whatever I do rotate, move another window over it, random click, anyway whatever makes new frames being generated, the teapot disappears.
The image is being uploaded and the shader initialised in openGL like follows
loading image:
static GLuint mipmapTexture;
struct floatStruct{
float r;
float g;
float b;
float a;
};
void initEnvData(){
char * infix[] = {"1_536_s","0_768_s","0_384_s","0_192_s","0_096_s","0_048_s","0_024_s","0_012_s","0_006_s","0_003_s","1p_s"};
GLenum target = GL_TEXTURE_2D;
char str[40];
int dimx = 0;
int dimy = 0;
glGenTextures(1, &mipmapTexture);
for (int i = 0; i<11;i++){
strcpy(str,infix);
strcat(str,".exr");
Imf::Rgba * pixelBuffer;
floatStruct * floatBuffer;
try{
Imf::RgbaInputFile in(str);
Imath::Box2i win = in.dataWindow();
Imath::V2i dim(win.max.x - win.min.x + 1, win.max.y - win.min.y + 1);
dimx = dim.x;
dimy = dim.y;
pixelBuffer = new Imf::Rgba[dim.x * dim.y];
floatBuffer = new floatStruct[dim.x * dim.y];
int dx = win.min.x;
int dy = win.min.y;
in.setFrameBuffer(pixelBuffer - dx - dy * dim.x, 1, dim.x);
in.readPixels(win.min.y, win.max.y);
}catch(Iex::BaseExc & e){
std::cerr << e.what() << std::endl;
}
cout<<"Image loaded to buffer: " << str <<endl;
for(int q = 0; q < dimx*dimy; q++){
floatBuffer[q].r = pixelBuffer[q].r;
floatBuffer[q].g = pixelBuffer[q].g;
floatBuffer[q].b = pixelBuffer[q].b;
floatBuffer[q].a = pixelBuffer[q].a;
}
cout<<"Halfs converted to floats: " << str <<endl;
cout <<floatBuffer[0].r<<" "<<floatBuffer[0].g<<" "<<floatBuffer[0].b<<" "<<floatBuffer[0].a<<" "<<endl;
glEnable(target);
glBindTexture(target, mipmapTexture);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(target, i, GL_RGBA32F_ARB, dimx, dimy, 0,GL_RGBA, GL_FLOAT, floatBuffer);
float* data = (float*)malloc(dimx*dimy*4*sizeof(float));
glGetTexImage(target, i, GL_RGBA, GL_FLOAT, data);
cout <<data[0]<<" "<<data[1]<<" "<<data[2]<<" "<<data[3]<<" "<<endl;
free(data);
cout << "level "<< i <<": "<<dimx <<" * " <<dimy <<endl;
}
cgGLSetTextureParameter(cg_envmap, mipmapTexture);
cout << mipmapTexture <<endl;
checkCgErrors();
cgGLEnableTextureParameter(cg_envmap);
cout << "envmap loaded" << endl;
}
initializing shader
void initPhongRGBCgPrograms(){
// Create the vertex program
vp = cgCreateProgramFromFile(context, CG_SOURCE, "rgbLightingVertexProgram.cg", vertexProfile, "rgbLightingVertexProgram", NULL);
if(vp != NULL){
cgGLLoadProgram(vp);
// Grab the input parameters
cg_position = cgGetNamedParameter(vp, "position");
cg_normal = cgGetNamedParameter(vp, "normal");
cg_eyePosition = cgGetNamedParameter(vp, "eyePosition");
cgGLSetParameter3f(cg_eyePosition,d*sqrt3,d*sqrt3,d*sqrt3);
checkCgErrors();
std::cout<<"Vertex program loaded.\n";
}
else{
std::cout<<"The vertex program could not be loaded.\n";
exit(0);
}
// Create the fragment program
fp = cgCreateProgramFromFile(context, CG_SOURCE, "rgbLightingFragmentProgram.cg", fragmentProfile, "rgbLightingFragmentProgram", NULL);
if(fp != NULL){
cgGLLoadProgram(fp);
// Grab the input parameters
cg_envmap = cgGetNamedParameter(fp, "envmap");
checkCgErrors();
std::cout<<"Fragment program loaded.\n";
}
else{
std::cout<<"The fragment program could not be loaded.\n";
exit(0);
}
}
Anyone an idea why happens what apparently happens ?
Illustration:
frame1
frame2
frame3
