WIP: Enable support for EDR on Mac

Basic enablement of EDR support for EDR capable displays on Mac.

Added a new, “Extended sRGB” display option which enables the additional color/intensity range for viewport and Cycles renders.

@@ -759,6 +759,9 @@ class USERPREF_PT_viewport_quality(ViewportPanel, CenterAlignMixIn, Panel):
         col.prop(system, "use_overlay_smooth_wire", text="Overlay")
         col.prop(system, "use_edit_mode_smooth_wire", text="Edit Mode")
 
+        col = layout.column(heading="Viewport Colorspace")

@@ -5679,0 +5682,4 @@
+                           "Viewport High Dynamic Range",
+                           "Enable high dynamic range with extended colorspace in viewport, "
+                           "uncapping display brightness for rendered content.");
+  RNA_def_property_update(prop, 0, "rna_userdef_dpi_update");

@@ -171,2 +171,3 @@
     col.rgb = pow(col.rgb, vec3(parameters.exponent * 2.2));
-    col = clamp(col, 0.0, 1.0);
+    col = max(col, 0.0);
+    vec4 clamped_col = min(col, 1.0);

@@ -431,3 +431,3 @@
                                                  size_y,
                                                  true,
-                                                 GPU_RGBA8,
+                                                 GPU_RGBA16F,

@@ -52,6 +52,7 @@ bool GPU_compute_shader_support(void);
 bool GPU_shader_storage_buffer_objects_support(void);
 bool GPU_shader_image_load_store_support(void);
 bool GPU_shader_draw_parameters_support(void);
+bool GPU_HDR_support(void);

@@ -654,2 +654,4 @@
 struct GPUTexture *GPU_offscreen_color_texture(const GPUOffScreen *offscreen);
 
+/**
+ * Return the color texture of a #GPUOffScreen. Does not give ownership.

@@ -37,3 +37,3 @@
 
   if (overlay) {
-    fragColor = clamp(fragColor, 0.0, 1.0);
+    fragColor = max(fragColor, 0.0);

@@ -508,6 +508,18 @@ static void rna_ColorManagedViewSettings_look_set(PointerRNA *ptr, int value)
   }
 }
 
+static void rna_ColorManagedViewSettings_use_hdr_set(PointerRNA *ptr, bool value)

@@ -1092,0 +1111,4 @@
+  }
+  else {
+    /* else fill with black */
+    memset(rect, 0, sizeof(int) * rectx * recty);

@@ -658,1 +661,4 @@
+                                         bool use_viewport)
 {
+
+  /* Determine desired offscreen format. */

@@ -291,2 +291,3 @@
                                const bool use_predivide,
-                               const bool use_overlay)
+                               const bool use_overlay,
+                               const bool use_extended)

@@ -76,6 +78,9 @@ class RENDER_PT_color_management(RenderButtonsPanel, Panel):
         col.prop(view, "exposure")
         col.prop(view, "gamma")
 
+        if gpu.capabilities.hdr_support_get():

@@ -698,2 +679,2 @@
-
-        MEM_freeN(rect_byte);
+
+        /*Use floating point texture for material preview if High Dynamic Range enabled. */

@@ -405,6 +405,7 @@ void MTLBackend::capabilities_init(MTLContext *ctx)
   GCaps.compute_shader_support = true;
   GCaps.shader_storage_buffer_objects_support = true;
   GCaps.shader_draw_parameters_support = true;
+  GCaps.hdr_viewport_support = true;

@@ -1278,0 +1293,4 @@
+  RNA_def_property_ui_text(prop,
+                           "High Dynamic Range",
+                           "Enable high dynamic range with extended colorspace in viewport, "
+                           "uncapping display brightness for rendered content");

@@ -173,0 +173,4 @@
+    vec4 clamped_col = min(col, 1.0);
+
+    if (!parameters.use_extended) {
+      /* if we're not using an extended colour space, clamp the color 0..1 */

@@ -430,3 +430,3 @@
                                                  size_y,
                                                  true,
-                                                 GPU_RGBA8,
+                                                 GPU_RGBA16F,

@@ -464,9 +466,11 @@ static void gpu_viewport_draw_colormanaged(GPUViewport *viewport,
     GPU_batch_program_set_imm_shader(batch);
   }
   else {
+

@@ -1317,2 +1352,3 @@
+
   GPUOffScreen *offscreen = GPU_offscreen_create(
-      r_size[0], r_size[1], false, GPU_RGBA8, GPU_TEXTURE_USAGE_SHADER_READ, nullptr);
+      r_size[0], r_size[1], false, desired_format, GPU_TEXTURE_USAGE_SHADER_READ, nullptr);

@@ -74,6 +74,7 @@
 
 #include "BIF_glutil.h"
 
+#include "GPU_capabilities.h"