Fix T94900: Fix drawing artifacts sequencer+node editor.

The VSE and node editor only uses an overlay buffer to draw to the screen. The
GPUViewport assumes that platforms clears all textures during creation, but
they do not on selected platforms. What would lead to drawing from
uncleared memory.

This patch fixes this by clearing all viewport textures during creation.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_viewport.c b/source/blender/gpu/intern/gpu_viewport.c
index c604859fa94..6d8ff8e7088 100644
--- a/source/blender/gpu/intern/gpu_viewport.c
+++ b/source/blender/gpu/intern/gpu_viewport.c
@@ -137,19 +137,25 @@ struct DRWData **GPU_viewport_data_get(GPUViewport *viewport)
 static void gpu_viewport_textures_create(GPUViewport *viewport)
 {
   int *size = viewport->size;
+  float empty_pixel_fl[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+  uchar empty_pixel_u[4] = {0, 0, 0, 0};
 
   if (viewport->color_render_tx[0] == NULL) {
     viewport->color_render_tx[0] = GPU_texture_create_2d(
         "dtxl_color", UNPACK2(size), 1, GPU_RGBA16F, NULL);
+    GPU_texture_clear(viewport->color_render_tx[0], GPU_DATA_FLOAT, empty_pixel_fl);
     viewport->color_overlay_tx[0] = GPU_texture_create_2d(
         "dtxl_color_overlay", UNPACK2(size), 1, GPU_SRGB8_A8, NULL);
+    GPU_texture_clear(viewport->color_overlay_tx[0], GPU_DATA_UBYTE, empty_pixel_u);
   }
 
   if ((viewport->flag & GPU_VIEWPORT_STEREO) != 0 && viewport->color_render_tx[1] == NULL) {
     viewport->color_render_tx[1] = GPU_texture_create_2d(
         "dtxl_color_stereo", UNPACK2(size), 1, GPU_RGBA16F, NULL);
+    GPU_texture_clear(viewport->color_render_tx[1], GPU_DATA_FLOAT, empty_pixel_fl);
     viewport->color_overlay_tx[1] = GPU_texture_create_2d(
         "dtxl_color_overlay_stereo", UNPACK2(size), 1, GPU_SRGB8_A8, NULL);
+    GPU_texture_clear(viewport->color_overlay_tx[1], GPU_DATA_UBYTE, empty_pixel_u);
   }
 
   /* Can be shared with GPUOffscreen. */