int CShaderObject::GenProgram(const char* vertexShader, const char* fragmentShader)
{
NvGLSLProgram* prog = NvGLSLProgram::createFromStrings(vertexShader, fragmentShader);
if (prog) {
pid = prog->getProgram();
delete prog;
}
else pid =-1;
return pid;
}
unsigned int generate1DConvolutionFP_filter(const char* vs, float *weights, int width, bool vertical, bool tex2D, int img_width, int img_height)
{
// calculate new set of weights and offsets
int nsamples = 2*width+1;
int nsamples2 = (int) ceilf(nsamples/2.0f);
float *weights2 = new float [nsamples2];
float *offsets = new float [nsamples2];
for(int i=0; i<nsamples2; i++) {
float a = weights[i*2];
float b;
if (i*2+1 > nsamples-1)
b = 0;
else
b = weights[i*2+1];
weights2[i] = a + b;
offsets[i] = b / (a + b);
// printf("%d: %f %f\n", i, weights2[i], offsets[i]);
}
// printf("nsamples = %d\n", nsamples2);
char szBuffer[16];
std::ostringstream ost;
ost <<
"precision highp float;\n"
"uniform sampler2D TexSampler;\n"
"varying vec2 TexCoord0;\n"
"void main()\n"
"{\n"
"vec3 sum = vec3(0.0,0.0,0.0);\n"
"vec2 texcoord;\n";
for(int i=0; i<nsamples2; i++) {
float x_offset = 0, y_offset = 0;
if (vertical) {
y_offset = (i*2)-width+offsets[i];
} else {
x_offset = (i*2)-width+offsets[i];
}
if (tex2D) {
x_offset = x_offset / img_width;
y_offset = y_offset / img_height;
}
float weight = weights2[i];
sprintf(szBuffer, "%f", x_offset);
ost << "texcoord = TexCoord0 + vec2(" << szBuffer;
sprintf(szBuffer, "%f", y_offset);
ost << ", " << szBuffer << ");\n";
sprintf(szBuffer, "%f", weight);
ost << "sum += texture2D(TexSampler, texcoord).rgb*" << szBuffer << ";\n";
}
ost <<
"gl_FragColor = vec4(sum, 1.0);\n"
"}\n";
delete [] weights2;
delete [] offsets;
NvGLSLProgram* program = NvGLSLProgram::createFromStrings(vs, (char*)ost.str().c_str());
int id = program->getProgram();
return id;
}
