/**
* @brief Enable the render to the framebuffer
* @param enable If @c true we are enabling the rendering to fbo_render, if @c false we are rendering
* to fbo that represents the screen
* @sa R_DrawBuffers
* @return @c true if the fbo was bound, @c false if not supported or deactivated
*/
bool R_EnableRenderbuffer (bool enable)
{
if (!r_state.frameBufferObjectsInitialized || !r_config.frameBufferObject || !r_postprocess->integer || !r_programs->integer)
return false;
if (enable != r_state.renderbuffer_enabled) {
r_state.renderbuffer_enabled = enable;
if (enable)
R_UseFramebuffer(fbo_render);
else
R_UseFramebuffer(fbo_screen);
}
R_DrawBuffers(1);
return true;
}
/**
* @brief Delete all registered framebuffer and render buffer objects, clear memory
*/
void R_ShutdownFBObjects (void)
{
int i;
if (!r_state.frameBufferObjectsInitialized)
return;
for (i = 0; i < frameBufferObjectCount; i++)
R_DeleteFBObject(&frameBufferObjects[i]);
R_UseFramebuffer(&screenBuffer);
frameBufferObjectCount = 0;
OBJZERO(frameBufferObjects);
r_state.frameBufferObjectsInitialized = false;
Mem_Free(colorAttachments);
}
/**
* @brief blur from the source image pyramid into the dest image pyramid
*/
static void R_BlurStack (int levels, r_framebuffer_t **sources, r_framebuffer_t **dests)
{
int i;
for (i = 0; i < levels; i++) {
const int l = levels - i - 1;
R_UseProgram(i == 0 ? default_program : r_state.combine2_program);
R_UseFramebuffer(dests[l]);
R_BindTextureForTexUnit(sources[l]->textures[0], &texunit_0);
if (i != 0)
R_BindTextureForTexUnit(dests[l + 1]->textures[0], &texunit_1);
R_UseViewport(sources[l]);
R_DrawQuad();
R_Blur(dests[l], sources[l], 0, 1);
R_Blur(sources[l], dests[l], 0, 0);
}
}
/**
* @brief handle post-processing bloom
*/
void R_DrawBloom (void)
{
int i;
bool renderBufferState;
if (!r_config.frameBufferObject || !r_postprocess->integer || !r_programs->integer)
return;
/* save state, then set up for blit-style rendering to quads */
renderBufferState = R_RenderbufferEnabled();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
#ifndef GL_VERSION_ES_CM_1_0
glPushAttrib(GL_ENABLE_BIT | GL_VIEWPORT_BIT | GL_LIGHTING_BIT | GL_DEPTH_BUFFER_BIT);
#endif
glOrtho(0, viddef.context.width, viddef.context.height, 0, 9999.0f, SKYBOX_DEPTH);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
/* downsample into image pyramid */
R_ResolveMSAA(fbo_render);
R_BindTexture(fbo_render->textures[1]);
qglGenerateMipmapEXT(GL_TEXTURE_2D);
R_Blur(fbo_render, fbo_bloom0, 1, 0);
R_Blur(fbo_bloom0, fbo_bloom1, 0, 1);
R_UseFramebuffer(r_state.buffers0[0]);
R_BindTexture(fbo_bloom1->textures[0]);
qglGenerateMipmapEXT(GL_TEXTURE_2D);
R_UseViewport(r_state.buffers0[0]);
R_DrawQuad();
for (i = 1; i < DOWNSAMPLE_PASSES; i++) {
R_Blur(r_state.buffers0[i - 1], r_state.buffers1[i - 1], 0, 0);
R_Blur(r_state.buffers1[i - 1], r_state.buffers2[i - 1], 0, 1);
R_UseFramebuffer(r_state.buffers0[i]);
R_BindTexture(r_state.buffers2[i - 1]->textures[0]);
R_UseViewport(r_state.buffers0[i]);
R_DrawQuad();
}
/* blur and combine downsampled images */
R_BlurStack(DOWNSAMPLE_PASSES, r_state.buffers0, r_state.buffers1);
/* re-combine the blurred version with the original "glow" image */
R_UseProgram(r_state.combine2_program);
R_UseFramebuffer(fbo_bloom0);
R_BindTextureForTexUnit(fbo_render->textures[1], &texunit_0);
R_BindTextureForTexUnit(r_state.buffers1[0]->textures[0], &texunit_1);
R_UseViewport(fbo_screen);
R_DrawQuad();
/* draw final result to the screenbuffer */
R_UseFramebuffer(fbo_screen);
R_UseProgram(r_state.combine2_program);
R_BindTextureForTexUnit(fbo_render->textures[0], &texunit_0);
R_BindTextureForTexUnit(fbo_bloom0->textures[0], &texunit_1);
R_DrawQuad();
/* cleanup before returning */
R_UseProgram(default_program);
R_CheckError();
#ifndef GL_VERSION_ES_CM_1_0
glPopAttrib();
#endif
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_TEXTURE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
R_CheckError();
/* reset renderbuffer state to what it was before */
R_EnableRenderbuffer(renderBufferState);
}
