//----------------------------------------------------------
void ofTexture::allocate(int w, int h, int internalGlDataType, bool bUseARBExtention){
//our graphics card might not support arb so we have to see if it is supported.
#ifndef TARGET_OPENGLES
if (bUseARBExtention && GL_ARB_texture_rectangle){
texData.tex_w = w;
texData.tex_h = h;
texData.tex_t = w;
texData.tex_u = h;
texData.textureTarget = GL_TEXTURE_RECTANGLE_ARB;
} else
#endif
{
//otherwise we need to calculate the next power of 2 for the requested dimensions
//ie (320x240) becomes (512x256)
texData.tex_w = ofNextPow2(w);
texData.tex_h = ofNextPow2(h);
texData.tex_t = w / texData.tex_w;
texData.tex_u = h / texData.tex_h;
texData.textureTarget = GL_TEXTURE_2D;
}
texData.glTypeInternal = internalGlDataType;
// get the glType (format) and pixelType (type) corresponding to the glTypeInteral (internalFormat)
ofGetGlFormatAndType(texData.glTypeInternal, texData.glType, texData.pixelType);
// attempt to free the previous bound texture, if we can:
clear();
glGenTextures(1, (GLuint *)&texData.textureID); // could be more then one, but for now, just one
retain(texData.textureID);
glEnable(texData.textureTarget);
glBindTexture(texData.textureTarget, (GLuint)texData.textureID);
#ifndef TARGET_OPENGLES
// can't do this on OpenGL ES: on full-blown OpenGL,
// glInternalFormat and glFormat (GL_LUMINANCE below)
// can be different; on ES they must be exactly the same.
// glTexImage2D(texData.textureTarget, 0, texData.glTypeInternal, (GLint)texData.tex_w, (GLint)texData.tex_h, 0, GL_LUMINANCE, PIXEL_TYPE, 0); // init to black...
glTexImage2D(texData.textureTarget, 0, texData.glTypeInternal, (GLint)texData.tex_w, (GLint)texData.tex_h, 0, texData.glType, texData.pixelType, 0); // init to black...
#else
glTexImage2D(texData.textureTarget, 0, texData.glTypeInternal, texData.tex_w, texData.tex_h, 0, texData.glTypeInternal, texData.pixelType, 0);
#endif
glTexParameterf(texData.textureTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(texData.textureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(texData.textureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(texData.textureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glDisable(texData.textureTarget);
texData.width = w;
texData.height = h;
texData.bFlipTexture = false;
texData.bAllocated = true;
}
void ofFbo::readToPixels(ofFloatPixels & pixels, int attachmentPoint){
#ifndef TARGET_OPENGLES
getTextureReference(attachmentPoint).readToPixels(pixels);
#else
bind();
int format,type;
ofGetGlFormatAndType(settings.internalformat,format,type);
glReadPixels(0,0,settings.width, settings.height, format, GL_FLOAT, pixels.getPixels());
unbind();
#endif
}
int ofGetGlFormat(const T& pix) {
int glFormat, glType;
ofGetGlFormatAndType(ofGetGlInternalFormat(pix), glFormat, glType);
return glFormat;
}