Metal: GLSL Shader compatibility 5

MSL does not have an implicit global scope, this is emulated via macro's adding an indirection for uniforms, attributes, shader stage inputs and outputs such as:

#define roughness shaderinst->roughness.

Variables in GLSL which exist within uniform blocks can be directly referenced via the global scope, unlike standard C++. This means that variable name pollution occurs if subsequent local variables in the code use the same name, resulting in compilation errors.

A number of these conflicting names have been renamed to ensure unique naming and no further scope pollution.

Ref T96261

Reviewed By: fclem

Maniphest Tasks: T96261

Differential Revision: https://developer.blender.org/D14452

source/blender/draw/engines/eevee/eevee_lightprobes.c

@@ -204,7 +204,7 @@ void EEVEE_lightbake_cache_init(EEVEE_ViewLayerData *sldata,
 
     DRW_shgroup_uniform_float(grp, "intensityFac", &pinfo->intensity_fac, 1);
     DRW_shgroup_uniform_float(grp, "sampleCount", &pinfo->samples_len, 1);
-    DRW_shgroup_uniform_float(grp, "roughness", &pinfo->roughness, 1);
+    DRW_shgroup_uniform_float(grp, "probe_roughness", &pinfo->roughness, 1);
     DRW_shgroup_uniform_float(grp, "lodFactor", &pinfo->lodfactor, 1);
     DRW_shgroup_uniform_float(grp, "lodMax", &pinfo->lod_rt_max, 1);
     DRW_shgroup_uniform_float(grp, "texelSize", &pinfo->texel_size, 1);

source/blender/draw/engines/eevee/shaders/lightprobe_filter_glossy_frag.glsl

@@ -4,7 +4,7 @@
 #pragma BLENDER_REQUIRE(common_math_geom_lib.glsl)
 
 uniform samplerCube probeHdr;
-uniform float roughness;
+uniform float probe_roughness;
 uniform float texelSize;
 uniform float lodFactor;
 uniform float lodMax;
@@ -51,7 +51,7 @@ void main()
 
     float pdf;
     /* Microfacet normal */
-    vec3 H = sample_ggx(Xi, roughness, V, N, T, B, pdf);
+    vec3 H = sample_ggx(Xi, probe_roughness, V, N, T, B, pdf);
     vec3 L = -reflect(V, H);
     float NL = dot(N, L);
 

source/blender/draw/engines/workbench/shaders/infos/workbench_prepass_info.hh

@@ -74,7 +74,7 @@ GPU_SHADER_INTERFACE_INFO(workbench_material_iface, "")
     .smooth(Type::FLOAT, "alpha_interp")
     .smooth(Type::VEC2, "uv_interp")
     .flat(Type::INT, "object_id")
-    .flat(Type::FLOAT, "roughness")
+    .flat(Type::FLOAT, "_roughness")
     .flat(Type::FLOAT, "metallic");
 
 GPU_SHADER_CREATE_INFO(workbench_material)

source/blender/draw/engines/workbench/shaders/workbench_prepass_frag.glsl

@@ -7,7 +7,7 @@ void main()
 {
   normalData = workbench_normal_encode(gl_FrontFacing, normal_interp);
 
-  materialData = vec4(color_interp, workbench_float_pair_encode(roughness, metallic));
+  materialData = vec4(color_interp, workbench_float_pair_encode(_roughness, metallic));
 
   objectId = uint(object_id);
 

source/blender/draw/engines/workbench/shaders/workbench_prepass_hair_vert.glsl

@@ -66,7 +66,7 @@ void main()
 
   normal_interp = normalize(normal_world_to_view(nor));
 
-  workbench_material_data_get(resource_handle, color_interp, alpha_interp, roughness, metallic);
+  workbench_material_data_get(resource_handle, color_interp, alpha_interp, _roughness, metallic);
 
   if (materialIndex == 0) {
     color_interp = hair_get_customdata_vec3(ac);
@@ -76,7 +76,7 @@ void main()
    * So we lower their alpha artificially. */
   alpha_interp *= 0.3;
 
-  workbench_hair_random_material(hair_rand, color_interp, roughness, metallic);
+  workbench_hair_random_material(hair_rand, color_interp, _roughness, metallic);
 
   object_id = int(uint(resource_handle) & 0xFFFFu) + 1;
 }

source/blender/draw/engines/workbench/shaders/workbench_prepass_pointcloud_vert.glsl

@@ -19,7 +19,7 @@ void main()
 
   uv_interp = vec2(0.0);
 
-  workbench_material_data_get(resource_handle, color_interp, alpha_interp, roughness, metallic);
+  workbench_material_data_get(resource_handle, color_interp, alpha_interp, _roughness, metallic);
 
   if (materialIndex == 0) {
     color_interp = vec3(1.0);

source/blender/draw/engines/workbench/shaders/workbench_prepass_vert.glsl

@@ -16,7 +16,7 @@ void main()
 
   normal_interp = normalize(normal_object_to_view(nor));
 
-  workbench_material_data_get(resource_handle, color_interp, alpha_interp, roughness, metallic);
+  workbench_material_data_get(resource_handle, color_interp, alpha_interp, _roughness, metallic);
 
   if (materialIndex == 0) {
     color_interp = ac.rgb;

source/blender/draw/engines/workbench/shaders/workbench_transparent_accum_frag.glsl

@@ -62,7 +62,7 @@ void main()
 #endif
 
 #ifdef V3D_LIGHTING_STUDIO
-  vec3 shaded_color = get_world_lighting(color, roughness, metallic, N, I);
+  vec3 shaded_color = get_world_lighting(color, _roughness, metallic, N, I);
 #endif
 
 #ifdef V3D_LIGHTING_FLAT

source/blender/draw/intern/shaders/common_colormanagement_lib.glsl

@@ -12,19 +12,19 @@ vec4 texture_read_as_linearrgb(sampler2D tex, bool premultiplied, vec2 co)
 {
   /* By convention image textures return scene linear colors, but
    * overlays still assume srgb. */
-  vec4 color = texture(tex, co);
+  vec4 col = texture(tex, co);
   /* Unpremultiply if stored multiplied, since straight alpha is expected by shaders. */
-  if (premultiplied && !(color.a == 0.0 || color.a == 1.0)) {
-    color.rgb = color.rgb / color.a;
+  if (premultiplied && !(col.a == 0.0 || col.a == 1.0)) {
+    col.rgb = col.rgb / col.a;
   }
-  return color;
+  return col;
 }
 
 vec4 texture_read_as_srgb(sampler2D tex, bool premultiplied, vec2 co)
 {
-  vec4 color = texture_read_as_linearrgb(tex, premultiplied, co);
-  color.r = linearrgb_to_srgb(color.r);
-  color.g = linearrgb_to_srgb(color.g);
-  color.b = linearrgb_to_srgb(color.b);
-  return color;
+  vec4 col = texture_read_as_linearrgb(tex, premultiplied, co);
+  col.r = linearrgb_to_srgb(col.r);
+  col.g = linearrgb_to_srgb(col.g);
+  col.b = linearrgb_to_srgb(col.b);
+  return col;
 }

source/blender/draw/intern/shaders/common_view_clipping_lib.glsl

@@ -6,13 +6,13 @@
 void view_clipping_distances(vec3 wpos)
 {
 #  ifdef USE_WORLD_CLIP_PLANES
-  vec4 pos = vec4(wpos, 1.0);
-  gl_ClipDistance[0] = dot(drw_view.clip_planes[0], pos);
-  gl_ClipDistance[1] = dot(drw_view.clip_planes[1], pos);
-  gl_ClipDistance[2] = dot(drw_view.clip_planes[2], pos);
-  gl_ClipDistance[3] = dot(drw_view.clip_planes[3], pos);
-  gl_ClipDistance[4] = dot(drw_view.clip_planes[4], pos);
-  gl_ClipDistance[5] = dot(drw_view.clip_planes[5], pos);
+  vec4 pos_4d = vec4(wpos, 1.0);
+  gl_ClipDistance[0] = dot(drw_view.clip_planes[0], pos_4d);
+  gl_ClipDistance[1] = dot(drw_view.clip_planes[1], pos_4d);
+  gl_ClipDistance[2] = dot(drw_view.clip_planes[2], pos_4d);
+  gl_ClipDistance[3] = dot(drw_view.clip_planes[3], pos_4d);
+  gl_ClipDistance[4] = dot(drw_view.clip_planes[4], pos_4d);
+  gl_ClipDistance[5] = dot(drw_view.clip_planes[5], pos_4d);
 #  endif
 }
 

source/blender/gpu/shaders/gpu_shader_cfg_world_clip_lib.glsl

@@ -7,13 +7,13 @@ uniform vec4 WorldClipPlanes[6];
 
 #    define _world_clip_planes_calc_clip_distance(wpos, _clipplanes) \
       { \
-        vec4 pos = vec4(wpos, 1.0); \
-        gl_ClipDistance[0] = dot(_clipplanes[0], pos); \
-        gl_ClipDistance[1] = dot(_clipplanes[1], pos); \
-        gl_ClipDistance[2] = dot(_clipplanes[2], pos); \
-        gl_ClipDistance[3] = dot(_clipplanes[3], pos); \
-        gl_ClipDistance[4] = dot(_clipplanes[4], pos); \
-        gl_ClipDistance[5] = dot(_clipplanes[5], pos); \
+        vec4 _pos = vec4(wpos, 1.0); \
+        gl_ClipDistance[0] = dot(_clipplanes[0], _pos); \
+        gl_ClipDistance[1] = dot(_clipplanes[1], _pos); \
+        gl_ClipDistance[2] = dot(_clipplanes[2], _pos); \
+        gl_ClipDistance[3] = dot(_clipplanes[3], _pos); \
+        gl_ClipDistance[4] = dot(_clipplanes[4], _pos); \
+        gl_ClipDistance[5] = dot(_clipplanes[5], _pos); \
       }
 
 /* When all shaders are builtin shaders are migrated this could be applied directly. */

source/blender/gpu/shaders/gpu_shader_colorspace_lib.glsl

@@ -6,13 +6,13 @@
 uniform bool srgbTarget = false;
 #endif
 
-vec4 blender_srgb_to_framebuffer_space(vec4 col)
+vec4 blender_srgb_to_framebuffer_space(vec4 in_color)
 {
   if (srgbTarget) {
-    vec3 c = max(col.rgb, vec3(0.0));
+    vec3 c = max(in_color.rgb, vec3(0.0));
     vec3 c1 = c * (1.0 / 12.92);
     vec3 c2 = pow((c + 0.055) * (1.0 / 1.055), vec3(2.4));
-    col.rgb = mix(c1, c2, step(vec3(0.04045), c));
+    in_color.rgb = mix(c1, c2, step(vec3(0.04045), c));
   }
-  return col;
+  return in_color;
 }