WIP standard GL matrices

mardy · May 20, 2024 · bd136bb · bd136bb
1 parent a199a75
commit bd136bb
Showing 1 changed file with 21 additions and 2 deletions.
diff --git a/src/gc_gl.c b/src/gc_gl.c
@@ -2558,14 +2558,33 @@ void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top,
     tmp = 1.0f / (far - near);
     mt[2][0] = 0.0f;
     mt[2][1] = 0.0f;
-    mt[2][2] = -near * tmp;
-    mt[2][3] = -(far * near) * tmp;
+    mt[2][2] = -(far + near) * tmp;
+    mt[2][3] = -2.0 * (far * near) * tmp;
     mt[3][0] = 0.0f;
     mt[3][1] = 0.0f;
     mt[3][2] = -1.0f;
     mt[3][3] = 0.0f;
 
     glMultMatrixf((float *)mt);
+
+    mt[0][0] = 1.0;
+    mt[0][1] = 0.0;
+    mt[0][2] = 0.0;
+    mt[0][3] = 0.0;
+    mt[1][0] = 0.0;
+    mt[1][1] = 1.0;
+    mt[1][2] = 0.0;
+    mt[1][3] = 0.0;
+    mt[2][0] = 0.0;
+    mt[2][1] = 0.0;
+    mt[2][2] = 0.5;
+    mt[2][3] = -0.5;
+    mt[3][0] = 0.0;
+    mt[3][1] = 0.0;
+    mt[3][2] = 0.0;
+    mt[3][3] = 1.0;
+
+    glMultMatrixf((float *)mt);
 }
 
 void glOrtho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val)