Before using glDrawPixels called with the following code, can speed up: / * * Disable stuff that's likely to slow down glDrawPixels * (Omit as much of this as possible, when you know in advance * that the OpenGL state will already be set correctly. .) * / glDisable (GL_ALPHA_TEST); glDisable (GL_BLEND); glDisable (GL_DEPTH_TEST); glDisable (GL_DITHER); glDisable (GL_FOG); glDisable (GL_LIGHTING); glDisable (GL_LOGIC_OP); glDisable (GL_STENCIL_TEST); glDisable (GL_TEXTURE_1D); glDisable (GL_TEXTURE_2D); glPixelTransferi (GL_MAP_COLOR, GL_FALSE); glPixelTransferi (GL_RED_SCALE, 1); glPixelTransferi (GL_RED_BIAS, 0); glPixelTransferi (GL_GREEN_SCALE, 1); glPixelTransferi (GL_GREEN_BIAS, 0); glPixelTransferi (GL_BLUE_SCALE, 1); glPixelTransferi (GL_BLUE_BIAS, 0); GlpixelTransferi (GL_ALPHA_SCALE, 1); GLPIXELTRANSFERI (GL_ALPHA_BIAS, 0); / * * Disable Extensions That Could Slow Down Gldrawpixels. * (Actually, You Should Check for the Presen CE of the property * extension before maketed, there. I've omitted That * code for simplicity.) * /
#ifdef GL_EXT_convolution glDisable (GL_CONVOLUTION_1D_EXT); glDisable (GL_CONVOLUTION_2D_EXT); glDisable (GL_SEPARABLE_2D_EXT); #endif #ifdef GL_EXT_histogram glDisable (GL_HISTOGRAM_EXT); glDisable (GL_MINMAX_EXT); #endif #ifdef GL_EXT_texture3D glDisable (GL_TEXTURE_3D_EXT); #endif
