From c5ffbe243f941fdee2c8d360e4f9fe44ad742263 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Fri, 23 May 1997 20:05:24 +0000
Subject: [PATCH] First stab at using GL_TRIANGLE_STRIP's instead of
 GL_POLYGONS (to conserve memory)

---
 Main/mesh2GL.c | 47 ++++++++++++++++++++++-------------------------
 1 file changed, 22 insertions(+), 25 deletions(-)

diff --git a/Main/mesh2GL.c b/Main/mesh2GL.c
index 22646dbce..bc9fa90a9 100644
--- a/Main/mesh2GL.c
+++ b/Main/mesh2GL.c
@@ -53,7 +53,6 @@ static void mat3_cross_product(float result_vec[3], register float vec1[3],
 /* walk through mesh and make ogl calls */
 GLint mesh2GL(struct mesh *m) {
     GLint mesh;
-    /* static GLfloat color[4] = { 0.3, 0.7, 0.2, 1.0 }; */
 
     float x1, y1, x2, y2, z11, z12, z21, z22;
     float v1[3], v2[3], normal[3]; 
@@ -64,7 +63,6 @@ GLint mesh2GL(struct mesh *m) {
 
     mesh = glGenLists(1);
     glNewList(mesh, GL_COMPILE);
-    /* glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color ); */
 
     iend = m->cols - 1;
     jend = m->rows - 1;
@@ -75,48 +73,43 @@ GLint mesh2GL(struct mesh *m) {
     for ( i = 0; i < iend; i += istep ) {
 	x1 = m->originx;
 	x2 = x1 + (m->row_step * jstep);
+
+	glBegin(GL_TRIANGLE_STRIP);
+
 	for ( j = 0; j < jend; j += jstep ) {
 	    z11 = 0.03 * m->mesh_data[j         * m->rows + i        ];
 	    z12 = 0.03 * m->mesh_data[j         * m->rows + (i+istep)];
 	    z21 = 0.03 * m->mesh_data[(j+jstep) * m->rows + i        ];
 	    z22 = 0.03 * m->mesh_data[(j+jstep) * m->rows + (i+istep)];
 
-	    /* printf("x1 = %f  y1 = %f\n", x1, y1);
-	    printf("x2 = %f  y2 = %f\n", x2, y2);
-	    printf("z11 = %f  z12 = %f  z21 = %f  z22 = %f\n", 
-		   z11, z12, z21, z22); */
-
 	    v1[0] = x2 - x1; v1[1] = 0;       v1[2] = z21 - z11;
 	    v2[0] = x2 - x1; v2[1] = y2 - y1; v2[2] = z22 - z11;
 	    mat3_cross_product(normal, v1, v2);
 	    MAT3_NORMALIZE_VEC(normal,temp);
-	    glBegin(GL_POLYGON);
-	    glNormal3fv(normal);
-	    glVertex3f(x1, y1, z11);
+
+	    if ( j == 0 ) {
+		/* first time through */
+		glNormal3fv(normal);
+		glVertex3f(x1, y1, z11);
+		glVertex3f(x1, y2, z12);
+	    } else {
+		glNormal3fv(normal);
+	    }
+
 	    glVertex3f(x2, y1, z21);
-	    glVertex3f(x2, y2, z22);
-	    /* printf("(%f, %f, %f)\n", x1, y1, z11);
-	    printf("(%f, %f, %f)\n", x2, y1, z21);
-	    printf("(%f, %f, %f)\n", x2, y2, z22); */
-	    glEnd();
 	    
 	    v1[0] = x2 - x1; v1[1] = y2 - y1; v1[2] = z22 - z11;
 	    v2[0] = 0;       v2[1] = y2 - y1; v2[2] = z12 - z11;
 	    mat3_cross_product(normal, v1, v2);
 	    MAT3_NORMALIZE_VEC(normal,temp);
-	    glBegin(GL_POLYGON);
 	    glNormal3fv(normal);
-	    glVertex3f(x1, y1, z11);
 	    glVertex3f(x2, y2, z22);
-	    glVertex3f(x1, y2, z12);
-	    /* printf("(%f, %f, %f)\n", x1, y1, z11);
-	    printf("(%f, %f, %f)\n", x2, y2, z22);
-	    printf("(%f, %f, %f)\n", x1, y2, z12); */
-	    glEnd();
 
 	    x1 = x2;
 	    x2 = x1 + (m->row_step * jstep);
 	}
+	glEnd();
+
 	y1 = y2;
 	y2 = y1 + (m->col_step * istep);
     }
@@ -128,10 +121,14 @@ GLint mesh2GL(struct mesh *m) {
 
 
 /* $Log$
-/* Revision 1.3  1997/05/23 15:40:26  curt
-/* Added GNU copyright headers.
-/* Fog now works!
+/* Revision 1.4  1997/05/23 20:05:24  curt
+/* First stab at using GL_TRIANGLE_STRIP's instead of GL_POLYGONS (to conserve
+/* memory)
 /*
+ * Revision 1.3  1997/05/23 15:40:26  curt
+ * Added GNU copyright headers.
+ * Fog now works!
+ *
  * Revision 1.2  1997/05/23 00:35:13  curt
  * Trying to get fog to work ...
  *
-- 
2.39.2