Cleanup: Workbench: Remove checkerboard depth

This is not needed anymore with the new overlay xray fading.

4 files changed, 3 insertions, 77 deletions

diff --git a/source/blender/draw/CMakeLists.txt b/source/blender/draw/CMakeLists.txt
index e130ade91cf..6d7b422c4fb 100644
--- a/source/blender/draw/CMakeLists.txt
+++ b/source/blender/draw/CMakeLists.txt
@@ -245,7 +245,6 @@ data_to_c_simple(engines/eevee/shaders/volumetric_integration_frag.glsl SRC)
 
 data_to_c_simple(engines/workbench/shaders/workbench_cavity_lib.glsl SRC)
 data_to_c_simple(engines/workbench/shaders/workbench_cavity_frag.glsl SRC)
-data_to_c_simple(engines/workbench/shaders/workbench_checkerboard_depth_frag.glsl SRC)
 data_to_c_simple(engines/workbench/shaders/workbench_common_lib.glsl SRC)
 data_to_c_simple(engines/workbench/shaders/workbench_data_lib.glsl SRC)
 data_to_c_simple(engines/workbench/shaders/workbench_deferred_composite_frag.glsl SRC)
diff --git a/source/blender/draw/engines/workbench/shaders/workbench_checkerboard_depth_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_checkerboard_depth_frag.glsl
deleted file mode 100644
index c9711e9c7d6..00000000000
--- a/source/blender/draw/engines/workbench/shaders/workbench_checkerboard_depth_frag.glsl
+++ /dev/null
@@ -1,38 +0,0 @@
-
-/* 4x4 bayer matrix. */
-#define P(x) ((x + 0.5) * (1.0 / 16.0))
-const vec4 dither_mat[4] = vec4[4](vec4(P(0.0), P(8.0), P(2.0), P(10.0)),
-                                   vec4(P(12.0), P(4.0), P(14.0), P(6.0)),
-                                   vec4(P(3.0), P(11.0), P(1.0), P(9.0)),
-                                   vec4(P(15.0), P(7.0), P(13.0), P(5.0)));
-
-uniform float threshold = 0.5;
-uniform float offset = 0.0;
-
-/* Noise dithering pattern
- * 0 - Bayer matrix
- * 1 - Interlieved gradient noise
- */
-#define NOISE 1
-
-void main()
-{
-#if NOISE == 0
-  ivec2 tx = ivec2(gl_FragCoord.xy) % 4;
-  float noise = dither_mat[tx.x][tx.y];
-#elif NOISE == 1
-  /* Interlieved gradient noise by Jorge Jimenez
-   * http://www.iryoku.com/next-generation-post-processing-in-call-of-duty-advanced-warfare */
-  float noise = fract(
-      offset + 52.9829189 * fract(0.06711056 * gl_FragCoord.x + 0.00583715 * gl_FragCoord.y));
-#else
-#  error
-#endif
-
-  if (noise > threshold) {
-    discard;
-  }
-  else {
-    gl_FragDepth = 1.0;
-  }
-}
diff --git a/source/blender/draw/engines/workbench/workbench_forward.c b/source/blender/draw/engines/workbench/workbench_forward.c
index fff01f9618c..f2cc7cdf573 100644
--- a/source/blender/draw/engines/workbench/workbench_forward.c
+++ b/source/blender/draw/engines/workbench/workbench_forward.c
@@ -56,7 +56,6 @@ static struct {
   WORKBENCH_FORWARD_Shaders sh_data[GPU_SHADER_CFG_LEN];
 
   struct GPUShader *composite_sh_cache[2];
-  struct GPUShader *checker_depth_sh;
 
   struct GPUTexture *object_id_tx;             /* ref only, not alloced */
   struct GPUTexture *transparent_accum_tx;     /* ref only, not alloced */
@@ -72,7 +71,6 @@ extern char datatoc_workbench_forward_composite_frag_glsl[];
 extern char datatoc_workbench_forward_depth_frag_glsl[];
 extern char datatoc_workbench_forward_transparent_accum_frag_glsl[];
 extern char datatoc_workbench_data_lib_glsl[];
-extern char datatoc_workbench_checkerboard_depth_frag_glsl[];
 extern char datatoc_workbench_object_outline_lib_glsl[];
 extern char datatoc_workbench_curvature_lib_glsl[];
 extern char datatoc_workbench_prepass_vert_glsl[];
@@ -349,11 +347,6 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata)
   WORKBENCH_PrivateData *wpd = stl->g_data;
   workbench_private_data_init(wpd);
 
-  if (!e_data.checker_depth_sh) {
-    e_data.checker_depth_sh = DRW_shader_create_fullscreen(
-        datatoc_workbench_checkerboard_depth_frag_glsl, NULL);
-  }
-
   workbench_forward_outline_shaders_ensure(wpd, draw_ctx->sh_cfg);
 
   workbench_volume_engine_init();
@@ -438,31 +431,9 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata)
     workbench_aa_create_pass(vedata, &e_data.transparent_accum_tx);
   }
 
-  /* Checker Depth */
-  {
-    static float noise_offset = 0.0f;
-    float blend_threshold = 0.0f;
-
-    if (DRW_state_is_image_render()) {
-      /* TODO: Should be based on the number of samples used for render. */
-      noise_offset = fmodf(noise_offset + 1.0f / 8.0f, 1.0f);
-    }
-
-    if (XRAY_ENABLED(wpd)) {
-      blend_threshold = 1.0f - XRAY_ALPHA(wpd) * 0.9f;
-    }
-
-    if (wpd->shading.type == OB_WIRE) {
-      wpd->shading.xray_alpha = 0.0f;
-      wpd->shading.xray_alpha_wire = 0.0f;
-    }
-
-    int state = DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_ALWAYS;
-    psl->checker_depth_pass = DRW_pass_create("Checker Depth", state);
-    grp = DRW_shgroup_create(e_data.checker_depth_sh, psl->checker_depth_pass);
-    // DRW_shgroup_call(grp, DRW_cache_fullscreen_quad_get(), NULL);
-    DRW_shgroup_uniform_float_copy(grp, "threshold", blend_threshold);
-    DRW_shgroup_uniform_float_copy(grp, "offset", noise_offset);
+  if (wpd->shading.type == OB_WIRE) {
+    wpd->shading.xray_alpha = 0.0f;
+    wpd->shading.xray_alpha_wire = 0.0f;
   }
 }
 
@@ -481,7 +452,6 @@ void workbench_forward_engine_free()
   for (int index = 0; index < 2; index++) {
     DRW_SHADER_FREE_SAFE(e_data.composite_sh_cache[index]);
   }
-  DRW_SHADER_FREE_SAFE(e_data.checker_depth_sh);
 
   workbench_volume_engine_free();
   workbench_fxaa_engine_free();
@@ -828,10 +798,6 @@ void workbench_forward_draw_scene(WORKBENCH_Data *vedata)
 
   /* Color correct and Anti aliasing */
   workbench_aa_draw_pass(vedata, e_data.composite_buffer_tx);
-
-  /* Apply checker pattern */
-  GPU_framebuffer_bind(dfbl->depth_only_fb);
-  DRW_draw_pass(psl->checker_depth_pass);
 }
 
 void workbench_forward_draw_finish(WORKBENCH_Data *vedata)
diff --git a/source/blender/draw/engines/workbench/workbench_private.h b/source/blender/draw/engines/workbench/workbench_private.h
index 85e7147df1e..faf85e4a7de 100644
--- a/source/blender/draw/engines/workbench/workbench_private.h
+++ b/source/blender/draw/engines/workbench/workbench_private.h
@@ -164,7 +164,6 @@ typedef struct WORKBENCH_PassList {
   struct DRWPass *transparent_accum_pass;
   struct DRWPass *object_outline_pass;
   struct DRWPass *depth_pass;
-  struct DRWPass *checker_depth_pass;
 } WORKBENCH_PassList;
 
 typedef struct WORKBENCH_Data {