Cleanup: GPU: Encapsulate scissor test

source/blender/editors/screen/screen_draw.c

@@ -404,7 +404,7 @@ void ED_screen_draw_edges(wmWindow *win)
   /* It seems that all areas gets smaller when pixelsize is > 1.
    * So in order to avoid missing pixels we just disable de scissors. */
   if (U.pixelsize <= 1.0f) {
-    glEnable(GL_SCISSOR_TEST);
+    GPU_scissor_test(true);
   }
 
   UI_GetThemeColor4fv(TH_EDITOR_OUTLINE, col);
@@ -429,7 +429,7 @@ void ED_screen_draw_edges(wmWindow *win)
   GPU_blend(false);
 
   if (U.pixelsize <= 1.0f) {
-    glDisable(GL_SCISSOR_TEST);
+    GPU_scissor_test(false);
   }
 }
 

source/blender/editors/sculpt_paint/paint_cursor.c

@@ -615,8 +615,7 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
 
   if (load_tex(brush, vc, zoom, col, primary)) {
     GPU_color_mask(true, true, true, true);
-    GPU_depth_mask(false);
-    glDepthFunc(GL_ALWAYS);
+    GPU_depth_test(false);
 
     if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW) {
       GPU_matrix_push();

source/blender/gpu/GPU_state.h

@@ -55,6 +55,7 @@ void GPU_blend_set_func_separate(eGPUBlendFunction src_rgb,
 void GPU_depth_range(float near, float far);
 void GPU_depth_test(bool enable);
 bool GPU_depth_test_enabled(void);
+void GPU_scissor_test(bool enable);
 void GPU_line_smooth(bool enable);
 void GPU_line_width(float width);
 void GPU_point_size(float size);

source/blender/gpu/intern/gpu_framebuffer.c

@@ -979,10 +979,10 @@ void GPU_offscreen_bind(GPUOffScreen *ofs, bool save)
     GPUFrameBuffer *fb = GPU_framebuffer_active_get();
     gpuPushFrameBuffer(fb);
   }
-  glDisable(GL_SCISSOR_TEST);
   GPUFrameBuffer *ofs_fb = gpu_offscreen_fb_get(ofs);
   GPU_framebuffer_bind(ofs_fb);
   glDisable(GL_FRAMEBUFFER_SRGB);
+  GPU_scissor_test(false);
   GPU_shader_set_framebuffer_srgb_target(false);
 }
 

source/blender/gpu/intern/gpu_state.c

@@ -146,6 +146,16 @@ void GPU_program_point_size(bool enable)
   }
 }
 
+void GPU_scissor_test(bool enable)
+{
+  if (enable) {
+    glEnable(GL_SCISSOR_TEST);
+  }
+  else {
+    glDisable(GL_SCISSOR_TEST);
+  }
+}
+
 void GPU_scissor(int x, int y, int width, int height)
 {
   glScissor(x, y, width, height);

source/blender/windowmanager/intern/wm_draw.c

@@ -106,7 +106,7 @@ static void wm_paintcursor_draw(bContext *C, ScrArea *area, ARegion *region)
 
       if (pc->poll == NULL || pc->poll(C)) {
         /* Prevent drawing outside region. */
-        glEnable(GL_SCISSOR_TEST);
+        GPU_scissor_test(true);
         GPU_scissor(region->winrct.xmin,
                     region->winrct.ymin,
                     BLI_rcti_size_x(&region->winrct) + 1,
@@ -121,7 +121,7 @@ static void wm_paintcursor_draw(bContext *C, ScrArea *area, ARegion *region)
           pc->draw(C, win->eventstate->x, win->eventstate->y, pc->customdata);
         }
 
-        glDisable(GL_SCISSOR_TEST);
+        GPU_scissor_test(false);
       }
     }
   }
@@ -461,7 +461,7 @@ static void wm_draw_region_bind(ARegion *region, int view)
 
     /* For now scissor is expected by region drawing, we could disable it
      * and do the enable/disable in the specific cases that setup scissor. */
-    glEnable(GL_SCISSOR_TEST);
+    GPU_scissor_test(true);
     GPU_scissor(0, 0, region->winx, region->winy);
   }
 
@@ -480,7 +480,7 @@ static void wm_draw_region_unbind(ARegion *region)
     GPU_viewport_unbind(region->draw_buffer->viewport);
   }
   else {
-    glDisable(GL_SCISSOR_TEST);
+    GPU_scissor_test(false);
     GPU_offscreen_unbind(region->draw_buffer->offscreen, false);
   }
 }