[Bf-blender-cvs] [5f11695] cycles-ptex-08: WIP add ptex vertex attrib to DerivedMesh for GPU drawing

[Nicholas Bishop]

Commit: 5f11695cd1239e202baf0854520a3653e3cce6b0
Author: Nicholas Bishop
Date:   Tue Jan 20 12:35:50 2015 +0100
Branches: cycles-ptex-08
https://developer.blender.org/rB5f11695cd1239e202baf0854520a3653e3cce6b0

WIP add ptex vertex attrib to DerivedMesh for GPU drawing

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

M	source/blender/blenkernel/BKE_DerivedMesh.h
M	source/blender/blenkernel/intern/DerivedMesh.c

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

diff --git a/source/blender/blenkernel/BKE_DerivedMesh.h b/source/blender/blenkernel/BKE_DerivedMesh.h
index da982f8..1bdeb96 100644
--- a/source/blender/blenkernel/BKE_DerivedMesh.h
+++ b/source/blender/blenkernel/BKE_DerivedMesh.h
@@ -740,7 +740,12 @@ typedef struct DMVertexAttribs {
 		int em_offset, gl_index, gl_texco;
 	} orco;
 
-	int tottface, totmcol, tottang, totorco;
+	struct {
+		struct MPtexTessFace *array;
+		int em_offset, gl_index, gl_texco;
+	} ptex;
+
+	int tottface, totmcol, tottang, totorco, totptex;
 } DMVertexAttribs;
 
 void DM_vertex_attributes_from_gpu(DerivedMesh *dm,
diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 9b5592b..5110dd7 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -3080,6 +3080,21 @@ 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;
 		}
+		else if (gattribs->layer[b].type == CD_PTEX_TESSFACE) {
+			layer = CustomData_get_layer_index(fdata, CD_PTEX_TESSFACE);
+			attribs->totptex = 1;
+			if (layer != -1) {
+				attribs->ptex.array = fdata->layers[layer].data;
+				attribs->ptex.em_offset = vdata->layers[layer].offset;
+			}
+			else {
+				attribs->ptex.array = NULL;
+				attribs->ptex.em_offset = -1;
+			}
+
+			attribs->ptex.gl_index = gattribs->layer[b].glindex;
+			attribs->ptex.gl_texco = gattribs->layer[b].gltexco;
+		}
 	}
 }
 
@@ -3144,6 +3159,22 @@ void DM_draw_attrib_vertex(DMVertexAttribs *attribs, int a, int index, int vert)
 		const float *tang = (array) ? array[a * 4 + vert] : zero;
 		glVertexAttrib4fvARB(attribs->tang.gl_index, tang);
 	}
+
+	/* ptex texture coordinates */
+	if (attribs->totptex) {
+		MPtexTessFace *array = attribs->ptex.array;
+		float ptex[3] = {0.0f, 0.0f, 0.0f};
+		if (array) {
+			// TODO
+			copy_v2_v2(ptex, attribs->ptex.array[a].corners[vert].uv);
+			ptex[2] = attribs->ptex.array[a].corners[vert].id;
+		}
+
+		if (attribs->ptex.gl_texco)
+			glTexCoord3fv(ptex);
+		else
+			glVertexAttrib3fvARB(attribs->ptex.gl_index, ptex);
+	}
 }
 
 /* Set object's bounding box based on DerivedMesh min/max data */