Commit: ed59d03bfcac7e0b21c82febe6b6f2f786b62034
Author: Clément Foucault
Date: Thu Jun 22 02:01:58 2017 +0200
Branches: blender2.8
https://developer.blender.org/rBed59d03bfcac7e0b21c82febe6b6f2f786b62034
GPUFramebuffer: Add recursive downsampling function.
This special case function enables rendering to a miplevel while using the
miplevels above as texture input.
This is needed for some algorithm (i.e. creating a min-max depth pyramid
texture).
===================================================================
M source/blender/draw/intern/DRW_render.h
M source/blender/draw/intern/draw_manager.c
M source/blender/gpu/GPU_framebuffer.h
M source/blender/gpu/intern/gpu_framebuffer.c
===================================================================
diff --git a/source/blender/draw/intern/DRW_render.h
b/source/blender/draw/intern/DRW_render.h
index aa6b836be17..07e9abcbd47 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -202,6 +202,9 @@ void DRW_framebuffer_texture_layer_attach(struct
GPUFrameBuffer *fb, struct GPUT
void DRW_framebuffer_cubeface_attach(struct GPUFrameBuffer *fb, struct
GPUTexture *tex, int slot, int face, int mip);
void DRW_framebuffer_texture_detach(struct GPUTexture *tex);
void DRW_framebuffer_blit(struct GPUFrameBuffer *fb_read, struct
GPUFrameBuffer *fb_write, bool depth);
+void DRW_framebuffer_recursive_downsample(
+ struct GPUFrameBuffer *fb, struct GPUTexture *tex, int num_iter,
+ void (*callback)(void *userData, int level), void *userData);
void DRW_framebuffer_viewport_size(struct GPUFrameBuffer *fb_read, int x, int
y, int w, int h);
void DRW_framebuffer_free(struct GPUFrameBuffer *fb);
#define DRW_FRAMEBUFFER_FREE_SAFE(fb) do { \
diff --git a/source/blender/draw/intern/draw_manager.c
b/source/blender/draw/intern/draw_manager.c
index d01f7f5823e..e390ab33c69 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -2137,6 +2137,12 @@ void DRW_framebuffer_blit(struct GPUFrameBuffer
*fb_read, struct GPUFrameBuffer
GPU_framebuffer_blit(fb_read, 0, fb_write, 0, depth);
}
+void DRW_framebuffer_recursive_downsample(
+ struct GPUFrameBuffer *fb, struct GPUTexture *tex, int num_iter,
+ void (*callback)(void *userData, int level), void *userData)
+{
+ GPU_framebuffer_recursive_downsample(fb, tex, num_iter, callback,
userData);
+}
void DRW_framebuffer_viewport_size(struct GPUFrameBuffer *UNUSED(fb_read), int
x, int y, int w, int h)
{
glViewport(x, y, w, h);
diff --git a/source/blender/gpu/GPU_framebuffer.h
b/source/blender/gpu/GPU_framebuffer.h
index 6778930f61c..a079d12b469 100644
--- a/source/blender/gpu/GPU_framebuffer.h
+++ b/source/blender/gpu/GPU_framebuffer.h
@@ -75,6 +75,10 @@ void GPU_framebuffer_blit(
GPUFrameBuffer *fb_read, int read_slot,
GPUFrameBuffer *fb_write, int write_slot, bool use_depth);
+void GPU_framebuffer_recursive_downsample(
+ GPUFrameBuffer *fb, struct GPUTexture *tex, int num_iter,
+ void (*callback)(void *userData, int level), void *userData);
+
/* GPU OffScreen
* - wrapper around framebuffer and texture for simple offscreen drawing
* - changes size if graphics card can't support it */
diff --git a/source/blender/gpu/intern/gpu_framebuffer.c
b/source/blender/gpu/intern/gpu_framebuffer.c
index d791f839e20..ddf0e83309c 100644
--- a/source/blender/gpu/intern/gpu_framebuffer.c
+++ b/source/blender/gpu/intern/gpu_framebuffer.c
@@ -142,16 +142,7 @@ bool GPU_framebuffer_texture_attach(GPUFrameBuffer *fb,
GPUTexture *tex, int slo
else
attachment = GL_COLOR_ATTACHMENT0 + slot;
-#if defined(WITH_GL_PROFILE_COMPAT)
- /* Workaround for Mac & Mesa compatibility profile, remove after we
switch to core profile */
- /* glFramebufferTexture was introduced in 3.2. It is *not* available in
the ARB FBO extension */
- if (GLEW_VERSION_3_2)
- glFramebufferTexture(GL_FRAMEBUFFER, attachment,
GPU_texture_opengl_bindcode(tex), mip); /* normal core call, same as below */
- else
- glFramebufferTexture2D(GL_FRAMEBUFFER, attachment,
GPU_texture_target(tex), GPU_texture_opengl_bindcode(tex), mip);
-#else
glFramebufferTexture(GL_FRAMEBUFFER, attachment,
GPU_texture_opengl_bindcode(tex), mip);
-#endif
if (GPU_texture_depth(tex))
fb->depthtex = tex;
@@ -250,16 +241,7 @@ void GPU_framebuffer_texture_detach(GPUTexture *tex)
attachment = GL_COLOR_ATTACHMENT0 + fb_attachment;
}
-#if defined(WITH_GL_PROFILE_COMPAT)
- /* Workaround for Mac & Mesa compatibility profile, remove after we
switch to core profile */
- /* glFramebufferTexture was introduced in 3.2. It is *not* available in
the ARB FBO extension */
- if (GLEW_VERSION_3_2)
- glFramebufferTexture(GL_FRAMEBUFFER, attachment, 0, 0); /*
normal core call, same as below */
- else
- glFramebufferTexture2D(GL_FRAMEBUFFER, attachment,
GPU_texture_target(tex), 0, 0);
-#else
glFramebufferTexture(GL_FRAMEBUFFER, attachment, 0, 0);
-#endif
GPU_texture_framebuffer_set(tex, NULL, -1);
}
@@ -554,6 +536,63 @@ void GPU_framebuffer_blit(GPUFrameBuffer *fb_read, int
read_slot, GPUFrameBuffer
glDrawBuffer(GL_COLOR_ATTACHMENT0);
}
+/**
+ * Use this if you need to custom downsample your texture and use the previous
mip level as input.
+ * This function only takes care of the correct texture handling. It execute
the callback for each texture level.
+ **/
+void GPU_framebuffer_recursive_downsample(
+ GPUFrameBuffer *fb, GPUTexture *tex, int num_iter, void
(*callback)(void *userData, int level), void *userData)
+{
+ int current_dim[2] = {GPU_texture_width(tex), GPU_texture_height(tex)};
+ GLenum attachment;
+
+ /* Manually setup framebuffer to not use GPU_texture_framebuffer_set()
*/
+ glBindFramebuffer(GL_FRAMEBUFFER, fb->object);
+ GG.currentfb = fb->object;
+
+ if (GPU_texture_stencil(tex) && GPU_texture_depth(tex))
+ attachment = GL_DEPTH_STENCIL_ATTACHMENT;
+ else if (GPU_texture_depth(tex))
+ attachment = GL_DEPTH_ATTACHMENT;
+ else
+ attachment = GL_COLOR_ATTACHMENT0;
+
+ /* last bound prevails here, better allow explicit control here too */
+ glDrawBuffer(GL_COLOR_ATTACHMENT0);
+ glReadBuffer(GL_COLOR_ATTACHMENT0);
+
+ for (int i=1; i < num_iter+1 && (current_dim[0] > 1 && current_dim[1] >
1); i++) {
+
+ /* calculate next viewport size */
+ current_dim[0] /= 2;
+ current_dim[1] /= 2;
+
+ /* ensure that the viewport size is always at least 1x1 */
+ CLAMP_MIN(current_dim[0], 1);
+ CLAMP_MIN(current_dim[1], 1);
+
+ glViewport(0, 0, current_dim[0], current_dim[1]);
+
+ /* bind next level for rendering but first restrict fetches
only to previous level */
+ GPU_texture_bind(tex, 0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, i-1);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, i-1);
+ GPU_texture_unbind(tex);
+
+ glFramebufferTexture2D(GL_FRAMEBUFFER, attachment,
GL_TEXTURE_2D, GPU_texture_opengl_bindcode(tex), i);
+
+ callback(userData, i);
+ }
+
+ glFramebufferTexture(GL_FRAMEBUFFER, attachment, 0, 0);
+
+ /* reset mipmap level range for the depth image */
+ GPU_texture_bind(tex, 0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, num_iter - 1);
+ GPU_texture_unbind(tex);
+}
+
/* GPUOffScreen */
struct GPUOffScreen {
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