[Bf-blender-cvs] [db21312bfb3] greasepencil-refactor: GPU: Framebuffer: Add GPU_framebuffer_multi_clear

[Clément Foucault]

Commit: db21312bfb310db2c935d2e45897ea167ff12d77
Author: Clément Foucault
Date:   Fri Dec 13 19:28:37 2019 +0100
Branches: greasepencil-refactor
https://developer.blender.org/rBdb21312bfb310db2c935d2e45897ea167ff12d77

GPU: Framebuffer: Add GPU_framebuffer_multi_clear

This is to clear individual targets using a different color.

===================================================================

M	source/blender/gpu/GPU_framebuffer.h
M	source/blender/gpu/intern/gpu_framebuffer.c

===================================================================

diff --git a/source/blender/gpu/GPU_framebuffer.h b/source/blender/gpu/GPU_framebuffer.h
index 7d0f8b0bcbf..213cbe30794 100644
--- a/source/blender/gpu/GPU_framebuffer.h
+++ b/source/blender/gpu/GPU_framebuffer.h
@@ -173,6 +173,8 @@ void GPU_framebuffer_clear(GPUFrameBuffer *fb,
 #define GPU_framebuffer_clear_color_depth_stencil(fb, col, depth, stencil) \
   GPU_framebuffer_clear(fb, GPU_COLOR_BIT | GPU_DEPTH_BIT | GPU_STENCIL_BIT, col, depth, stencil)
 
+void GPU_framebuffer_multi_clear(GPUFrameBuffer *fb, const float (*clear_cols)[4]);
+
 void GPU_framebuffer_read_depth(GPUFrameBuffer *fb, int x, int y, int w, int h, float *data);
 void GPU_framebuffer_read_color(
     GPUFrameBuffer *fb, int x, int y, int w, int h, int channels, int slot, float *data);
diff --git a/source/blender/gpu/intern/gpu_framebuffer.c b/source/blender/gpu/intern/gpu_framebuffer.c
index a531c22365c..9da842f6409 100644
--- a/source/blender/gpu/intern/gpu_framebuffer.c
+++ b/source/blender/gpu/intern/gpu_framebuffer.c
@@ -612,6 +612,19 @@ void GPU_framebuffer_clear(GPUFrameBuffer *fb,
   glClear(mask);
 }
 
+/* Clear all textures bound to this framebuffer with a different color. */
+void GPU_framebuffer_multi_clear(GPUFrameBuffer *fb, const float (*clear_cols)[4])
+{
+  CHECK_FRAMEBUFFER_IS_BOUND(fb);
+
+  GPUAttachmentType type = GPU_FB_COLOR_ATTACHMENT0;
+  for (int i = 0; type < GPU_FB_MAX_ATTACHEMENT; i++, type++) {
+    if (fb->attachments[type].tex != NULL) {
+      glClearBufferfv(GL_COLOR, i, clear_cols[i]);
+    }
+  }
+}
+
 void GPU_framebuffer_read_depth(GPUFrameBuffer *fb, int x, int y, int w, int h, float *data)
 {
   CHECK_FRAMEBUFFER_IS_BOUND(fb);