From 804e90b42d728ecb1073af8d0bae15a91b13a469 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Tue, 11 Feb 2020 15:18:55 +0100
Subject: DRW: Color Management improvement

Reviewed By: brecht sergey jbakker

Differential Revision: http://developer.blender.org/D6729
---
 .../draw/engines/overlay/overlay_background.c      | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 source/blender/draw/engines/overlay/overlay_background.c

(limited to 'source/blender/draw/engines/overlay/overlay_background.c')

diff --git a/source/blender/draw/engines/overlay/overlay_background.c b/source/blender/draw/engines/overlay/overlay_background.c
new file mode 100644
index 00000000000..23aad3506ad
--- /dev/null
+++ b/source/blender/draw/engines/overlay/overlay_background.c
@@ -0,0 +1,112 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2020, Blender Foundation.
+ */
+
+/** \file
+ * \ingroup draw_engine
+ */
+
+#include "DRW_render.h"
+
+#include "UI_resources.h"
+
+#include "overlay_private.h"
+#include "draw_manager_text.h"
+
+#define BG_SOLID 0
+#define BG_GRADIENT 1
+#define BG_CHECKER 2
+
+void OVERLAY_background_cache_init(OVERLAY_Data *vedata)
+{
+  OVERLAY_PassList *psl = vedata->psl;
+  OVERLAY_PrivateData *pd = vedata->stl->pd;
+  DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
+  const DRWContextState *draw_ctx = DRW_context_state_get();
+  const Scene *scene = draw_ctx->scene;
+  const RegionView3D *rv3d = draw_ctx->rv3d;
+  const BoundBox *bb = rv3d->clipbb;
+  const View3D *v3d = draw_ctx->v3d;
+  bool draw_clipping_bounds = (pd->clipping_state != 0);
+
+  {
+    float color_override[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+    int background_type;
+    if (!DRW_state_draw_background()) {
+      background_type = BG_CHECKER;
+    }
+    else if (v3d->shading.background_type == V3D_SHADING_BACKGROUND_WORLD && scene->world) {
+      background_type = BG_SOLID;
+      /* TODO(fclem) this is a scene refered linear color. we should convert
+       * it to display linear here. */
+      copy_v3_v3(color_override, &scene->world->horr);
+      color_override[3] = 1.0f;
+    }
+    else if (v3d->shading.background_type == V3D_SHADING_BACKGROUND_VIEWPORT) {
+      background_type = BG_SOLID;
+      copy_v3_v3(color_override, v3d->shading.background_color);
+      color_override[3] = 1.0f;
+    }
+    else if (UI_GetThemeValue(TH_SHOW_BACK_GRAD)) {
+      background_type = BG_GRADIENT;
+    }
+    else {
+      background_type = BG_SOLID;
+    }
+
+    DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_BACKGROUND;
+    DRW_PASS_CREATE(psl->background_ps, state);
+
+    GPUShader *sh = OVERLAY_shader_background();
+    DRWShadingGroup *grp = DRW_shgroup_create(sh, psl->background_ps);
+    DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+    DRW_shgroup_uniform_texture_ref(grp, "colorBuffer", &dtxl->color);
+    DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &dtxl->depth);
+    DRW_shgroup_uniform_vec4_copy(grp, "colorOverride", color_override);
+    DRW_shgroup_uniform_int_copy(grp, "bgType", background_type);
+    DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
+  }
+
+  if (draw_clipping_bounds) {
+    DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA | DRW_STATE_CULL_BACK;
+    DRW_PASS_CREATE(psl->clipping_frustum_ps, state);
+
+    GPUShader *sh = OVERLAY_shader_clipbound();
+    DRWShadingGroup *grp = DRW_shgroup_create(sh, psl->clipping_frustum_ps);
+    DRW_shgroup_uniform_vec4_copy(grp, "color", G_draw.block.colorClippingBorder);
+    DRW_shgroup_uniform_vec3(grp, "boundbox", &bb->vec[0][0], 8);
+
+    struct GPUBatch *cube = DRW_cache_cube_get();
+    DRW_shgroup_call(grp, cube, NULL);
+  }
+  else {
+    psl->clipping_frustum_ps = NULL;
+  }
+}
+
+void OVERLAY_background_draw(OVERLAY_Data *vedata)
+{
+  OVERLAY_PassList *psl = vedata->psl;
+
+  if (DRW_state_is_fbo()) {
+    if (psl->clipping_frustum_ps) {
+      DRW_draw_pass(psl->clipping_frustum_ps);
+    }
+
+    DRW_draw_pass(psl->background_ps);
+  }
+}
-- 
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