Cleanup: Port glClear calls to GPU module functions

source/blender/draw/engines/eevee/eevee_lut_gen.c

@@ -76,8 +76,7 @@ static struct GPUTexture *create_ggx_lut_texture(int UNUSED(w), int UNUSED(h))
   DRW_draw_pass(pass);
 
   float *data = MEM_mallocN(sizeof(float[3]) * w * h, "lut");
-  glReadBuffer(GL_COLOR_ATTACHMENT0);
-  glReadPixels(0, 0, w, h, GL_RGB, GL_FLOAT, data);
+  GPU_framebuffer_read_color(fb, 0, 0, w, h, 3, 0, data);
 
   printf("{");
   for (int i = 0; i < w * h * 3; i += 3) {

source/blender/editors/gpencil/gpencil_fill.c

@@ -398,8 +398,8 @@ static bool gpencil_render_offscreen(tGPDfill *tgpf)
   GPU_matrix_push();
   GPU_matrix_identity_set();
 
-  glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
-  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  GPU_clear_color(0.0f, 0.0f, 0.0f, 0.0f);
+  GPU_clear(GPU_COLOR_BIT | GPU_DEPTH_BIT);
 
   ED_view3d_update_viewmat(
       tgpf->depsgraph, tgpf->scene, tgpf->v3d, tgpf->region, NULL, winmat, NULL, true);

source/blender/editors/screen/area.c

@@ -357,12 +357,12 @@ static void region_draw_status_text(ScrArea *area, ARegion *region)
   bool overlap = ED_region_is_overlap(area->spacetype, region->regiontype);
 
   if (overlap) {
-    GPU_clear_color(0.0, 0.0, 0.0, 0.0);
-    glClear(GL_COLOR_BUFFER_BIT);
+    GPU_clear_color(0.0f, 0.0f, 0.0f, 0.0f);
+    GPU_clear(GPU_COLOR_BIT);
   }
   else {
     UI_ThemeClearColor(TH_HEADER);
-    glClear(GL_COLOR_BUFFER_BIT);
+    GPU_clear(GPU_COLOR_BIT);
   }
 
   int fontid = BLF_set_default();
@@ -527,7 +527,7 @@ void ED_region_do_draw(bContext *C, ARegion *region)
 
   if (area && area_is_pseudo_minimized(area)) {
     UI_ThemeClearColor(TH_EDITOR_OUTLINE);
-    glClear(GL_COLOR_BUFFER_BIT);
+    GPU_clear(GPU_COLOR_BIT);
     return;
   }
   /* optional header info instead? */

source/blender/windowmanager/intern/wm_draw.c

@@ -736,8 +736,8 @@ static void wm_draw_window_offscreen(bContext *C, wmWindow *win, bool stereo)
 
       wm_draw_region_buffer_create(region, false, false);
       wm_draw_region_bind(region, 0);
-      glClearColor(0, 0, 0, 0);
-      glClear(GL_COLOR_BUFFER_BIT);
+      GPU_clear_color(0, 0, 0, 0);
+      GPU_clear(GPU_COLOR_BIT);
       ED_region_do_draw(C, region);
       wm_draw_region_unbind(region);
 
@@ -759,8 +759,8 @@ static void wm_draw_window_onscreen(bContext *C, wmWindow *win, int view)
    * Actually this is only a problem when resizing the window.
    * If it becomes a problem we should clear only when window size changes. */
 #if 0
-  glClearColor(0, 0, 0, 0);
-  glClear(GL_COLOR_BUFFER_BIT);
+  GPU_clear_color(0, 0, 0, 0);
+  GPU_clear(GPU_COLOR_BIT);
 #endif
 
   /* Blit non-overlapping area regions. */

source/blender/windowmanager/intern/wm_playanim.c

@@ -58,6 +58,7 @@
 #include "BIF_glutil.h"
 
 #include "GPU_context.h"
+#include "GPU_framebuffer.h"
 #include "GPU_immediate.h"
 #include "GPU_immediate_util.h"
 #include "GPU_init_exit.h"
@@ -309,8 +310,8 @@ static void playanim_toscreen(
   CLAMP(offs_x, 0.0f, 1.0f);
   CLAMP(offs_y, 0.0f, 1.0f);
 
-  glClearColor(0.1, 0.1, 0.1, 0.0);
-  glClear(GL_COLOR_BUFFER_BIT);
+  GPU_clear_color(0.1, 0.1, 0.1, 0.0);
+  GPU_clear(GPU_COLOR_BIT);
 
   /* checkerboard for case alpha */
   if (ibuf->planes == 32) {
@@ -1315,8 +1316,8 @@ static char *wm_main_playanim_intern(int argc, const char **argv)
     maxwiny = ibuf->y * (1 + (maxwiny / ibuf->y));
   }
 
-  glClearColor(0.1, 0.1, 0.1, 0.0);
-  glClear(GL_COLOR_BUFFER_BIT);
+  GPU_clear_color(0.1, 0.1, 0.1, 0.0);
+  GPU_clear(GPU_COLOR_BIT);
 
   int win_x, win_y;
   playanim_window_get_size(&win_x, &win_y);

source/blender/windowmanager/intern/wm_window.c

@@ -648,10 +648,10 @@ static void wm_window_ghostwindow_add(wmWindowManager *wm,
     }
 #endif
     /* until screens get drawn, make it nice gray */
-    glClearColor(0.55, 0.55, 0.55, 0.0);
+    GPU_clear_color(0.55, 0.55, 0.55, 0.0);
     /* Crash on OSS ATI: bugs.launchpad.net/ubuntu/+source/mesa/+bug/656100 */
     if (!GPU_type_matches(GPU_DEVICE_ATI, GPU_OS_UNIX, GPU_DRIVER_OPENSOURCE)) {
-      glClear(GL_COLOR_BUFFER_BIT);
+      GPU_clear(GPU_COLOR_BIT);
     }
 
     /* needed here, because it's used before it reads userdef */