Properly handle vertex color color space for Cycles GLSL

A bit tricky, need to pass additional information about what the attribute
is and how to deal with it.

BI path stays unchanged, just to make things simplier for now.

Fixes T48555: Cycles GLSL- Incorrect Vertex Color results from Attribute node

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index bb5cc9cb067..0de0e4d7797 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -3673,6 +3673,7 @@ void DM_vertex_attributes_from_gpu(DerivedMesh *dm, GPUVertexAttribs *gattribs,
 			}
 
 			attribs->tface[a].gl_index = gattribs->layer[b].glindex;
+			attribs->tface[a].gl_info_index = gattribs->layer[b].glinfoindoex;
 			attribs->tface[a].gl_texco = gattribs->layer[b].gltexco;
 		}
 		else if (type == CD_MCOL) {
@@ -3696,6 +3697,7 @@ void DM_vertex_attributes_from_gpu(DerivedMesh *dm, GPUVertexAttribs *gattribs,
 			}
 
 			attribs->mcol[a].gl_index = gattribs->layer[b].glindex;
+			attribs->mcol[a].gl_info_index = gattribs->layer[b].glinfoindoex;
 		}
 		else if (type == CD_TANGENT) {
 			/* note, even with 'is_editmesh' this uses the derived-meshes loop data */
@@ -3718,6 +3720,7 @@ void DM_vertex_attributes_from_gpu(DerivedMesh *dm, GPUVertexAttribs *gattribs,
 			}
 
 			attribs->tang[a].gl_index = gattribs->layer[b].glindex;
+			attribs->tang[a].gl_info_index = gattribs->layer[b].glinfoindoex;
 		}
 		else if (type == CD_ORCO) {
 			/* original coordinates */
@@ -3737,6 +3740,7 @@ void DM_vertex_attributes_from_gpu(DerivedMesh *dm, GPUVertexAttribs *gattribs,
 
 			attribs->orco.gl_index = gattribs->layer[b].glindex;
 			attribs->orco.gl_texco = gattribs->layer[b].gltexco;
+			attribs->orco.gl_info_index = gattribs->layer[b].glinfoindoex;
 		}
 	}
 }
@@ -3765,6 +3769,7 @@ void DM_draw_attrib_vertex(DMVertexAttribs *attribs, int a, int index, int vert,
 			glTexCoord3fv(orco);
 		else
 			glVertexAttrib3fv(attribs->orco.gl_index, orco);
+		glUniform1i(attribs->orco.gl_info_index, 0);
 	}
 
 	/* uv texture coordinates */
@@ -3783,6 +3788,7 @@ void DM_draw_attrib_vertex(DMVertexAttribs *attribs, int a, int index, int vert,
 			glTexCoord2fv(uv);
 		else
 			glVertexAttrib2fv(attribs->tface[b].gl_index, uv);
+		glUniform1i(attribs->tface[b].gl_info_index, 0);
 	}
 
 	/* vertex colors */
@@ -3798,6 +3804,7 @@ void DM_draw_attrib_vertex(DMVertexAttribs *attribs, int a, int index, int vert,
 		}
 
 		glVertexAttrib4fv(attribs->mcol[b].gl_index, col);
+		glUniform1i(attribs->mcol[b].gl_info_index, GPU_ATTR_INFO_SRGB);
 	}
 
 	/* tangent for normal mapping */
@@ -3807,6 +3814,7 @@ void DM_draw_attrib_vertex(DMVertexAttribs *attribs, int a, int index, int vert,
 			const float *tang = (array) ? array[a * 4 + vert] : zero;
 			glVertexAttrib4fv(attribs->tang[b].gl_index, tang);
 		}
+		glUniform1i(attribs->tang[b].gl_info_index, 0);
 	}
 }