From 9eabfbf3f2642cde6615ea30c5942769071c83cf Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Wed, 1 Dec 2010 18:34:03 +0000
Subject: Calculate patch mesh texture coordinates.

---
 src/model/mapfile.cc | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

(limited to 'src/model')

diff --git a/src/model/mapfile.cc b/src/model/mapfile.cc
index 94a8eab..7775c8d 100644
--- a/src/model/mapfile.cc
+++ b/src/model/mapfile.cc
@@ -278,6 +278,7 @@ bool MapFile::read_patchdef()
 	}
 	
 	math::Vector3f patchvertices[rows][columns];
+	math::Vector2f patchtexcoords[rows][columns];
 	
 	// read rows
 	for (size_t r = 0; r < rows; r++) {
@@ -328,6 +329,7 @@ bool MapFile::read_patchdef()
 			}
 			
 			patchvertices[r][c].assign(x, y, z);
+			patchtexcoords[r][c].assign(tx, ty);
 		}
 		
 		if (!(linestream >> word)) {
@@ -394,8 +396,6 @@ bool MapFile::read_patchdef()
 	// patchvertices[][] are the control points as read from the .map file
 	// mesh[][] is a subdivideXsubdivide quad mesh calculated for each set of 9 control points in the patch
 	
-	// TODO texture coordinates, normals
-	
 	// TODO variable sibdivision
 	const size_t subdivide = 4;
 	const float binom[3] = {1.0f, 2.0f, 1.0f};
@@ -405,6 +405,7 @@ bool MapFile::read_patchdef()
 			
 			math::Vector3f mesh[subdivide + 1][subdivide +1];
 			math::Vector3f meshnormals[subdivide + 1][subdivide +1];
+			math::Vector2f meshtexcoords[subdivide + 1][subdivide +1];
 
 			for (size_t i = 0; i <= subdivide; i++) {
 				const float u = (float) i / (float) subdivide;
@@ -447,10 +448,35 @@ bool MapFile::read_patchdef()
 						}
 					}
 
+					// assign normal
 					meshnormals[i][j].assign(math::crossproduct(tan_u, tan_v));
 					meshnormals[i][j].normalize();
+					
+					// calculate texture coordinates
+					size_t tr = r;
+					size_t tc = c;
+					
+					float tu = u;
+					float tv = v;
+					
+					if (u >= 0.5f) {
+						tr++;
+						tu -= 0.5f;
+					}
+					if (v >= 0.5f) {
+						tc++;
+						tv -= 0.5f;
+					}
+					tu *= 2.0f;
+					tv *= 2.0f;
+
+					meshtexcoords[i][j] = (
+						(patchtexcoords[tr+1][tc] * tu + patchtexcoords[tr][tc] * (1.0f - tu)) * (1.0f - tv) +
+						(patchtexcoords[tr+1][tc+1] * tu + patchtexcoords[tr][tc+1] * (1.0f - tu)) * tv
+					);
+
 					class_box.expand(mesh[i][j] * SCALE);
-				}			
+				}
 			}
 			
 			const math::Vector3f zero;
@@ -465,9 +491,16 @@ bool MapFile::read_patchdef()
 					);
 					
 					quad->n0().assign(meshnormals[i+1][j+1]);
+					quad->t0().assign(meshtexcoords[i+1][j+1]);
+					
 					quad->n1().assign(meshnormals[i][j+1]);
+					quad->t1().assign(meshtexcoords[i][j+1]);
+					
 					quad->n2().assign(meshnormals[i][j]);
+					quad->t2().assign(meshtexcoords[i][j]);
+					
 					quad->n3().assign(meshnormals[i+1][j]);
+					quad->t3().assign(meshtexcoords[i+1][j]);
 					
 					primitives->add_quad(quad);
 				}
-- 
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