[Bf-blender-cvs] [1cb938ef2c9] blender-v2.82-release: Cycles: Fix viewport rendering when displaying as byte and not half float

[Patrick Mours]

Commit: 1cb938ef2c927d062439f06416bbf0bf8446625b
Author: Patrick Mours
Date:   Fri Jan 10 14:56:39 2020 +0100
Branches: blender-v2.82-release
https://developer.blender.org/rB1cb938ef2c927d062439f06416bbf0bf8446625b

Cycles: Fix viewport rendering when displaying as byte and not half float

Commit rB7e61e597253f3ca75f2fb86a57212ca750ffbbe8 broke viewport rendering when not displaying as halfs.
This fixes that by actually using the `scale` parameter that is passed into `film_map` and also de-duplicates code around it.

Differential Revision: https://developer.blender.org/D6557

===================================================================

M	intern/cycles/kernel/kernel_film.h

===================================================================

diff --git a/intern/cycles/kernel/kernel_film.h b/intern/cycles/kernel/kernel_film.h
index 7a974e9d852..fc3a6152b79 100644
--- a/intern/cycles/kernel/kernel_film.h
+++ b/intern/cycles/kernel/kernel_film.h
@@ -70,12 +70,12 @@ ccl_device float4 film_map(KernelGlobals *kg, float4 rgba_in, float scale)
   float4 result;
 
   /* conversion to srgb */
-  result.x = color_linear_to_srgb(rgba_in.x);
-  result.y = color_linear_to_srgb(rgba_in.y);
-  result.z = color_linear_to_srgb(rgba_in.z);
+  result.x = color_linear_to_srgb(rgba_in.x * scale);
+  result.y = color_linear_to_srgb(rgba_in.y * scale);
+  result.z = color_linear_to_srgb(rgba_in.z * scale);
 
   /* clamp since alpha might be > 1.0 due to russian roulette */
-  result.w = saturate(rgba_in.w);
+  result.w = saturate(rgba_in.w * scale);
 
   return result;
 }
@@ -108,19 +108,12 @@ ccl_device void kernel_film_convert_to_byte(KernelGlobals *kg,
   bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
   float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
 
-  rgba += index;
-
   /* map colors */
-  if (use_display_sample_scale) {
-    float4 float_result = film_map(kg, rgba_in, sample_scale);
-    uchar4 byte_result = film_float_to_byte(float_result);
-    *rgba = byte_result;
-  }
-  else {
-    float4 float_result = film_map(kg, rgba_in, 1.0);
-    uchar4 byte_result = film_float_to_byte(float_result);
-    *rgba = byte_result;
-  }
+  float4 float_result = film_map(kg, rgba_in, use_display_sample_scale ? sample_scale : 1.0f);
+  uchar4 uchar_result = film_float_to_byte(float_result);
+
+  rgba += index;
+  *rgba = uchar_result;
 }
 
 ccl_device void kernel_film_convert_to_half_float(KernelGlobals *kg,
@@ -134,16 +127,12 @@ ccl_device void kernel_film_convert_to_half_float(KernelGlobals *kg,
 {
   /* buffer offset */
   int index = offset + x + y * stride;
+
   bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
   float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
 
   ccl_global half *out = (ccl_global half *)rgba + index * 4;
-  if (use_display_sample_scale) {
-    float4_store_half(out, rgba_in, sample_scale);
-  }
-  else {
-    float4_store_half(out, rgba_in, 1.0f);
-  }
+  float4_store_half(out, rgba_in, use_display_sample_scale ? sample_scale : 1.0f);
 }
 
 CCL_NAMESPACE_END