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GPU: frame buffer stack 

Reviewers: fclem

Differential Revision: https://developer.blender.org/D3903
This commit is contained in:
Jacques Lucke 2018-11-06 15:24:13 +01:00
parent ddc64b9dd4
commit 50b43ff6d4
1 changed files with 37 additions and 1 deletions
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38
source/blender/gpu/intern/gpu_framebuffer.c
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@ -416,6 +416,31 @@ static void gpu_framebuffer_update_attachments(GPUFrameBuffer *fb)
glDrawBuffer(GL_NONE);
}
#define FRAMEBUFFER_STACK_DEPTH 16
static struct {
GPUFrameBuffer *framebuffers[FRAMEBUFFER_STACK_DEPTH];
uint top;
} FrameBufferStack = { 0 };
static void gpuPushFrameBuffer(GPUFrameBuffer *fbo)
{
BLI_assert(FrameBufferStack.top < FRAMEBUFFER_STACK_DEPTH);
FrameBufferStack.framebuffers[FrameBufferStack.top] = fbo;
FrameBufferStack.top++;
}
static GPUFrameBuffer *gpuPopFrameBuffer(void)
{
BLI_assert(FrameBufferStack.top > 0);
FrameBufferStack.top--;
return FrameBufferStack.framebuffers[FrameBufferStack.top];
}
#undef FRAMEBUFFER_STACK_DEPTH
void GPU_framebuffer_bind(GPUFrameBuffer *fb)
{
if (fb->object == 0)
@ -753,6 +778,8 @@ void GPU_offscreen_bind(GPUOffScreen *ofs, bool save)
{
if (save) {
gpuPushAttrib(GPU_SCISSOR_BIT | GPU_VIEWPORT_BIT);
GPUFrameBuffer *fb = GPU_framebuffer_active_get();
gpuPushFrameBuffer(fb);
}
glDisable(GL_SCISSOR_TEST);
GPU_framebuffer_bind(ofs->fb);
@ -760,9 +787,18 @@ void GPU_offscreen_bind(GPUOffScreen *ofs, bool save)
void GPU_offscreen_unbind(GPUOffScreen *UNUSED(ofs), bool restore)
{
GPU_framebuffer_restore();
GPUFrameBuffer *fb = NULL;
if (restore) {
gpuPopAttrib();
fb = gpuPopFrameBuffer();
}
if (fb) {
GPU_framebuffer_bind(fb);
}
else {
GPU_framebuffer_restore();
}
}