GPencil: Refactor of Draw Engine, Vertex Paint and all internal functions

This commit is a full refactor of the grease pencil modules including Draw Engine, Modifiers, VFX, depsgraph update, improvements in operators and conversion of Sculpt and Weight paint tools to real brushes.

Also, a huge code cleanup has been done at all levels.

Thanks to @fclem for his work and yo @pepeland and @mendio for the testing and help in the development.

Differential Revision: https://developer.blender.org/D6293

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_framebuffer.c b/source/blender/gpu/intern/gpu_framebuffer.c
index b0fbb0eae49..6197d5f99b8 100644
--- a/source/blender/gpu/intern/gpu_framebuffer.c
+++ b/source/blender/gpu/intern/gpu_framebuffer.c
@@ -614,6 +614,21 @@ 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);
+
+  glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+  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);