SL-19265: Fix precision issue with texture transforms by moving transform matrix calculation into the shader

6 files changed, 105 insertions, 51 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbralphaV.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbralphaV.glsl
index ddb53ff852..d44d1a2e6f 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pbralphaV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pbralphaV.glsl
@@ -44,10 +44,18 @@ uniform mat4 modelview_matrix;
 
 out vec3 vary_position;
 
-uniform mat3 texture_basecolor_matrix;
-uniform mat3 texture_normal_matrix;
-uniform mat3 texture_metallic_roughness_matrix;
-uniform mat3 texture_emissive_matrix;
+uniform vec2 texture_base_color_scale;
+uniform float texture_base_color_rotation;
+uniform vec2 texture_base_color_offset;
+uniform vec2 texture_normal_scale;
+uniform float texture_normal_rotation;
+uniform vec2 texture_normal_offset;
+uniform vec2 texture_metallic_roughness_scale;
+uniform float texture_metallic_roughness_rotation;
+uniform vec2 texture_metallic_roughness_offset;
+uniform vec2 texture_emissive_scale;
+uniform float texture_emissive_rotation;
+uniform vec2 texture_emissive_offset;
 
 #ifdef HAS_SUN_SHADOW
 out vec3 vary_fragcoord;
@@ -60,7 +68,7 @@ in vec3 normal;
 in vec4 tangent;
 in vec2 texcoord0;
 
-out vec2 basecolor_texcoord;
+out vec2 base_color_texcoord;
 out vec2 normal_texcoord;
 out vec2 metallic_roughness_texcoord;
 out vec2 emissive_texcoord;
@@ -71,7 +79,7 @@ out vec3 vary_tangent;
 flat out float vary_sign;
 out vec3 vary_normal;
 
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform);
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform);
 
 
 void main()
@@ -92,10 +100,10 @@ void main()
     vary_fragcoord.xyz = vert.xyz + vec3(0,0,near_clip);
 #endif
 
-	basecolor_texcoord = texture_transform(texcoord0, texture_basecolor_matrix, texture_matrix0);
-	normal_texcoord = texture_transform(texcoord0, texture_normal_matrix, texture_matrix0);
-	metallic_roughness_texcoord = texture_transform(texcoord0, texture_metallic_roughness_matrix, texture_matrix0);
-	emissive_texcoord = texture_transform(texcoord0, texture_emissive_matrix, texture_matrix0);
+	base_color_texcoord = texture_transform(texcoord0, texture_base_color_scale, texture_base_color_rotation, texture_base_color_offset, texture_matrix0);
+	normal_texcoord = texture_transform(texcoord0, texture_normal_scale, texture_normal_rotation, texture_normal_offset, texture_matrix0);
+	metallic_roughness_texcoord = texture_transform(texcoord0, texture_metallic_roughness_scale, texture_metallic_roughness_rotation, texture_metallic_roughness_offset, texture_matrix0);
+	emissive_texcoord = texture_transform(texcoord0, texture_emissive_scale, texture_emissive_rotation, texture_emissive_offset, texture_matrix0);
 
 #ifdef HAS_SKIN
 	vec3 n = (mat*vec4(normal.xyz+position.xyz,1.0)).xyz-pos.xyz;
@@ -128,19 +136,23 @@ uniform mat4 modelview_matrix;
 
 out vec3 vary_position;
 
-uniform mat3 texture_basecolor_matrix;
-uniform mat3 texture_emissive_matrix;
+uniform vec2 texture_base_color_scale;
+uniform float texture_base_color_rotation;
+uniform vec2 texture_base_color_offset;
+uniform vec2 texture_emissive_scale;
+uniform float texture_emissive_rotation;
+uniform vec2 texture_emissive_offset;
 
 in vec3 position;
 in vec4 diffuse_color;
 in vec2 texcoord0;
 
-out vec2 basecolor_texcoord;
+out vec2 base_color_texcoord;
 out vec2 emissive_texcoord;
 
 out vec4 vertex_color;
 
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform);
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform);
 
 
 void main()
@@ -150,8 +162,8 @@ void main()
     gl_Position = vert;
     vary_position = vert.xyz;
 
-	basecolor_texcoord = texture_transform(texcoord0, texture_basecolor_matrix, texture_matrix0);
-	emissive_texcoord = texture_transform(texcoord0, texture_emissive_matrix, texture_matrix0);
+	base_color_texcoord = texture_transform(texcoord0, texture_base_color_scale, texture_base_color_rotation, texture_base_color_offset, texture_matrix0);
+	emissive_texcoord = texture_transform(texcoord0, texture_emissive_scale, texture_emissive_rotation, texture_emissive_offset, texture_matrix0);
 
 	vertex_color = diffuse_color;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbrglowF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbrglowF.glsl
index 8dc9e02f7a..1c36aa6b50 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pbrglowF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pbrglowF.glsl
@@ -37,7 +37,7 @@ out vec4 frag_color;
 in vec3 vary_position;
 in vec4 vertex_emissive;
 
-in vec2 basecolor_texcoord;
+in vec2 base_color_texcoord;
 in vec2 emissive_texcoord;
 
 uniform float minimum_alpha; // PBR alphaMode: MASK, See: mAlphaCutoff, setAlphaCutoff()
@@ -47,7 +47,7 @@ vec3 srgb_to_linear(vec3 c);
 
 void main()
 {
-    vec4 basecolor = texture2D(diffuseMap, basecolor_texcoord.xy).rgba;
+    vec4 basecolor = texture2D(diffuseMap, base_color_texcoord.xy).rgba;
 
     if (basecolor.a < minimum_alpha)
     {
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbrglowV.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbrglowV.glsl
index bcad1c1ceb..b73d08cf0d 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pbrglowV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pbrglowV.glsl
@@ -34,20 +34,24 @@ uniform mat4 modelview_projection_matrix;
 
 uniform mat4 texture_matrix0;
 
-uniform mat3 texture_basecolor_matrix;
-uniform mat3 texture_emissive_matrix;
+uniform vec2 texture_base_color_scale;
+uniform float texture_base_color_rotation;
+uniform vec2 texture_base_color_offset;
+uniform vec2 texture_emissive_scale;
+uniform float texture_emissive_rotation;
+uniform vec2 texture_emissive_offset;
 
 in vec3 position;
 in vec4 emissive;
 
 in vec2 texcoord0;
 
-out vec2 basecolor_texcoord;
+out vec2 base_color_texcoord;
 out vec2 emissive_texcoord;
  
 out vec4 vertex_emissive;
 
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform);
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform);
 
 void main()
 {
@@ -64,8 +68,8 @@ void main()
     gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0); 
 #endif
 
-    basecolor_texcoord = texture_transform(texcoord0, texture_basecolor_matrix, texture_matrix0);
-    emissive_texcoord = texture_transform(texcoord0, texture_emissive_matrix, texture_matrix0);
+    base_color_texcoord = texture_transform(texcoord0, texture_base_color_scale, texture_base_color_rotation, texture_base_color_offset, texture_matrix0);
+    emissive_texcoord = texture_transform(texcoord0, texture_emissive_scale, texture_emissive_rotation, texture_emissive_offset, texture_matrix0);
 
     vertex_emissive = emissive;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbropaqueF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbropaqueF.glsl
index c4c5a7872b..6659e67a7a 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pbropaqueF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pbropaqueF.glsl
@@ -47,7 +47,7 @@ in vec3 vary_normal;
 in vec3 vary_tangent;
 flat in float vary_sign;
 
-in vec2 basecolor_texcoord;
+in vec2 base_color_texcoord;
 in vec2 normal_texcoord;
 in vec2 metallic_roughness_texcoord;
 in vec2 emissive_texcoord;
@@ -62,7 +62,7 @@ uniform mat3 normal_matrix;
 
 void main()
 {
-    vec4 basecolor = texture2D(diffuseMap, basecolor_texcoord.xy).rgba;
+    vec4 basecolor = texture2D(diffuseMap, base_color_texcoord.xy).rgba;
     if (basecolor.a < minimum_alpha)
     {
         discard;
@@ -121,7 +121,7 @@ out vec4 frag_color;
 in vec3 vary_position;
 in vec4 vertex_color;
 
-in vec2 basecolor_texcoord;
+in vec2 base_color_texcoord;
 in vec2 emissive_texcoord;
 
 uniform float minimum_alpha; // PBR alphaMode: MASK, See: mAlphaCutoff, setAlphaCutoff()
@@ -131,7 +131,7 @@ vec3 srgb_to_linear(vec3 c);
 
 void main()
 {
-    vec4 basecolor = texture2D(diffuseMap, basecolor_texcoord.xy).rgba;
+    vec4 basecolor = texture2D(diffuseMap, base_color_texcoord.xy).rgba;
     if (basecolor.a < minimum_alpha)
     {
         discard;
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbropaqueV.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbropaqueV.glsl
index f0e3d4f034..6f50aefdab 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pbropaqueV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pbropaqueV.glsl
@@ -38,10 +38,18 @@ uniform mat4 modelview_projection_matrix;
 #endif
 uniform mat4 texture_matrix0;
 
-uniform mat3 texture_basecolor_matrix;
-uniform mat3 texture_normal_matrix;
-uniform mat3 texture_metallic_roughness_matrix;
-uniform mat3 texture_emissive_matrix;
+uniform vec2 texture_base_color_scale;
+uniform float texture_base_color_rotation;
+uniform vec2 texture_base_color_offset;
+uniform vec2 texture_normal_scale;
+uniform float texture_normal_rotation;
+uniform vec2 texture_normal_offset;
+uniform vec2 texture_metallic_roughness_scale;
+uniform float texture_metallic_roughness_rotation;
+uniform vec2 texture_metallic_roughness_offset;
+uniform vec2 texture_emissive_scale;
+uniform float texture_emissive_rotation;
+uniform vec2 texture_emissive_offset;
 
 in vec3 position;
 in vec4 diffuse_color;
@@ -49,7 +57,7 @@ in vec3 normal;
 in vec4 tangent;
 in vec2 texcoord0;
 
-out vec2 basecolor_texcoord;
+out vec2 base_color_texcoord;
 out vec2 normal_texcoord;
 out vec2 metallic_roughness_texcoord;
 out vec2 emissive_texcoord;
@@ -60,7 +68,7 @@ out vec3 vary_tangent;
 flat out float vary_sign;
 out vec3 vary_normal;
 
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform);
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform);
 
 void main()
 {
@@ -78,10 +86,10 @@ void main()
 	gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0); 
 #endif
 
-    basecolor_texcoord = texture_transform(texcoord0, texture_basecolor_matrix, texture_matrix0);
-    normal_texcoord = texture_transform(texcoord0, texture_normal_matrix, texture_matrix0);
-    metallic_roughness_texcoord = texture_transform(texcoord0, texture_metallic_roughness_matrix, texture_matrix0);
-    emissive_texcoord = texture_transform(texcoord0, texture_emissive_matrix, texture_matrix0);
+    base_color_texcoord = texture_transform(texcoord0, texture_base_color_scale, texture_base_color_rotation, texture_base_color_offset, texture_matrix0);
+    normal_texcoord = texture_transform(texcoord0, texture_normal_scale, texture_normal_rotation, texture_normal_offset, texture_matrix0);
+    metallic_roughness_texcoord = texture_transform(texcoord0, texture_metallic_roughness_scale, texture_metallic_roughness_rotation, texture_metallic_roughness_offset, texture_matrix0);
+    emissive_texcoord = texture_transform(texcoord0, texture_emissive_scale, texture_emissive_rotation, texture_emissive_offset, texture_matrix0);
 
 #ifdef HAS_SKIN
 	vec3 n = (mat*vec4(normal.xyz+position.xyz,1.0)).xyz-pos.xyz;
@@ -106,29 +114,37 @@ uniform mat4 modelview_projection_matrix;
 
 uniform mat4 texture_matrix0;
 
-uniform mat3 texture_basecolor_matrix;
-uniform mat3 texture_normal_matrix;
-uniform mat3 texture_metallic_roughness_matrix;
-uniform mat3 texture_emissive_matrix;
+uniform vec2 texture_base_color_scale;
+uniform float texture_base_color_rotation;
+uniform vec2 texture_base_color_offset;
+uniform vec2 texture_normal_scale;
+uniform float texture_normal_rotation;
+uniform vec2 texture_normal_offset;
+uniform vec2 texture_metallic_roughness_scale;
+uniform float texture_metallic_roughness_rotation;
+uniform vec2 texture_metallic_roughness_offset;
+uniform vec2 texture_emissive_scale;
+uniform float texture_emissive_rotation;
+uniform vec2 texture_emissive_offset;
 
 in vec3 position;
 in vec4 diffuse_color;
 in vec2 texcoord0;
 
-out vec2 basecolor_texcoord;
+out vec2 base_color_texcoord;
 out vec2 emissive_texcoord;
  
 out vec4 vertex_color;
 
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform);
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform);
 
 void main()
 {
     //transform vertex
     gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0); 
 
-    basecolor_texcoord = texture_transform(texcoord0, texture_basecolor_matrix, texture_matrix0);
-    emissive_texcoord = texture_transform(texcoord0, texture_emissive_matrix, texture_matrix0);
+    base_color_texcoord = texture_transform(texcoord0, texture_base_color_scale, texture_base_color_rotation, texture_base_color_offset, texture_matrix0);
+    emissive_texcoord = texture_transform(texcoord0, texture_emissive_scale, texture_emissive_rotation, texture_emissive_offset, texture_matrix0);
 
     vertex_color = diffuse_color;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/textureUtilV.glsl b/indra/newview/app_settings/shaders/class1/deferred/textureUtilV.glsl
index b146c665f9..6ad317ca63 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/textureUtilV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/textureUtilV.glsl
@@ -23,6 +23,31 @@
  * $/LicenseInfo$
  */
 
+// This shader code is taken from the sample code on the KHR_texture_transform
+// spec page page, plus or minus some sign error corrections (I think because the GLSL
+// matrix constructor is backwards?):
+// https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_texture_transform
+// Previously (6494eed242b1), we passed in a single, precalculated matrix
+// uniform per transform into the shaders. However, that was found to produce
+// small-but-noticeable discrepancies with the GLTF sample model
+// "TextureTransformTest", likely due to numerical precision differences. In
+// the interest of parity with other renderers, calculate the transform
+// directly in the shader. -Cosmic,2023-02-24
+vec2 khr_texture_transform(vec2 texcoord, vec2 scale, float rotation, vec2 offset)
+{
+    mat3 scale_mat = mat3(scale.x,0,0, 0,scale.y,0, 0,0,1);
+    mat3 offset_mat = mat3(1,0,0, 0,1,0, offset.x, offset.y, 1);
+    mat3 rotation_mat = mat3(
+        cos(rotation),-sin(rotation), 0,
+        sin(rotation), cos(rotation), 0,
+                    0,             0, 1
+    );
+
+    mat3 transform = offset_mat * rotation_mat * scale_mat;
+
+    return (transform * vec3(texcoord, 1)).xy;
+}
+
 // vertex_texcoord - The UV texture coordinates sampled from the vertex at
 //     runtime. Per SL convention, this is in a right-handed UV coordinate
 //     system. Collada models also have right-handed UVs.
@@ -33,17 +58,14 @@
 //     animations, available through LSL script functions such as
 //     LlSetTextureAnim. It assumes a right-handed UV coordinate system.
 // texcoord - The final texcoord to use for image sampling
-vec2 texture_transform(vec2 vertex_texcoord, mat3 khr_gltf_transform, mat4 sl_animation_transform)
+vec2 texture_transform(vec2 vertex_texcoord, vec2 khr_gltf_scale, float khr_gltf_rotation, vec2 khr_gltf_offset, mat4 sl_animation_transform)
 {
     vec2 texcoord = vertex_texcoord;
 
     // Convert to left-handed coordinate system. The offset of 1 is necessary
     // for rotations to be applied correctly.
-    // In the future, we could bake this coordinate conversion into the uniform
-    // that khr_gltf_transform comes from, since it's applied immediately
-    // before.
     texcoord.y = 1.0 - texcoord.y;
-    texcoord = (khr_gltf_transform * vec3(texcoord, 1.0)).xy;
+    texcoord = khr_texture_transform(texcoord, khr_gltf_scale, khr_gltf_rotation, khr_gltf_offset);
     // Convert back to right-handed coordinate system
     texcoord.y = 1.0 - texcoord.y;
     texcoord = (sl_animation_transform * vec4(texcoord, 0, 1)).xy;