UI: Theme options for checkerboard pattern colors and size

This patch adds ability to set up colors and size of background
(transparency) checkerboard pattern in viewport and 2d editors. No new
backgrounds, only changing colors in existing ones.

This is not the background of the viewport, it is a transparency
checkerboard that is turned on only in render mode, when the
transparency mode is on. And also in 2D-editors, (image, sequencer,
etc).

Reviewed By: Pablo Vazquez, Julian Eisel

Differential Revision: https://developer.blender.org/D6791

1 files changed, 11 insertions, 3 deletions

diff --git a/source/blender/gpu/intern/gpu_immediate_util.c b/source/blender/gpu/intern/gpu_immediate_util.c
index 28544d50ba1..7266f595447 100644
--- a/source/blender/gpu/intern/gpu_immediate_util.c
+++ b/source/blender/gpu/intern/gpu_immediate_util.c
@@ -29,6 +29,8 @@
 #include "GPU_immediate.h"
 #include "GPU_immediate_util.h"
 
+#include "UI_resources.h"
+
 static const float cube_coords[8][3] = {
     {-1, -1, -1},
     {-1, -1, +1},
@@ -362,11 +364,17 @@ void imm_draw_box_wire_3d(uint pos, float x1, float y1, float x2, float y2)
 void imm_draw_box_checker_2d(float x1, float y1, float x2, float y2)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+  float checker_primary[4];
+  float checker_secondary[4];
+  int checker_size = UI_GetThemeValue(TH_TRANSPARENT_CHECKER_SIZE);
+
   immBindBuiltinProgram(GPU_SHADER_2D_CHECKER);
+  UI_GetThemeColor4fv(TH_TRANSPARENT_CHECKER_PRIMARY, checker_primary);
+  UI_GetThemeColor4fv(TH_TRANSPARENT_CHECKER_SECONDARY, checker_secondary);
 
-  immUniform4f("color1", 0.15f, 0.15f, 0.15f, 1.0f);
-  immUniform4f("color2", 0.2f, 0.2f, 0.2f, 1.0f);
-  immUniform1i("size", 8);
+  immUniform4fv("color1", checker_primary);
+  immUniform4fv("color2", checker_secondary);
+  immUniform1i("size", checker_size);
 
   immRectf(pos, x1, y1, x2, y2);