[Gzz-commits] gzz/gfx/demo irregu3.py

[Janne V. Kujala]

CVSROOT:        /cvsroot/gzz
Module name:    gzz
Changes by:     Janne V. Kujala <address@hidden>        02/10/30 10:42:39

Modified files:
        gfx/demo       : irregu3.py 

Log message:
        Start NV30 fragment program profile

CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/gzz/gfx/demo/irregu3.py.diff?tr1=1.34&tr2=1.35&r1=text&r2=text

Patches:
Index: gzz/gfx/demo/irregu3.py
diff -u gzz/gfx/demo/irregu3.py:1.34 gzz/gfx/demo/irregu3.py:1.35
--- gzz/gfx/demo/irregu3.py:1.34        Tue Oct 29 12:36:53 2002
+++ gzz/gfx/demo/irregu3.py     Wed Oct 30 10:42:39 2002
@@ -17,6 +17,9 @@
 profiles = []
 
 
+if (GL.hasExtension("GL_NV_fragment_program")):
+    profiles.append("NV_PROG")
+
 if (GL.hasExtension("GL_NV_texture_shader")):
     profiles.append("NV_SHAD")
 
@@ -58,6 +61,40 @@
     using_shader = 0
     using_secondary_color = 0
     using_multitex = 0
+
+    if profile == "NV_PROG":
+        code = """!FP1.0;
+        # Compute one pixel difference of texcoords in R0
+        DDX R0, f[TEX0];
+        DDY R1, f[TEX0];
+        MUL R0, R0, R0;
+        MAD R0, R1, R1;
+        RSQ R1.x, R0.x;
+        RSQ R1.y, R0.y;
+        MUL R0, R1;
+
+        # Compute texcoord +/- 1 pixel
+        ADD R1, f[TEX0], R0;
+        ADD R2, f[TEX0], -R0;
+
+        # Compute texcoord +/- 2 pixels
+        ADD R3, R1, R0;
+        ADD R4, R2, -R0;
+
+        # Read texture
+        TEX R0, R0, TEX0, 2D;
+        TEX R1, R1, TEX0, 2D;
+        TEX R2, R2, TEX0, 2D;
+        TEX R3, R3, TEX0, 2D;
+        TEX R4, R4, TEX0, 2D;
+
+        # Add c * sqrt(1 - r^2) 
+        ...
+        
+        # Take maximum
+        ...
+        
+        """
     
     if profile == "NV_SHAD":
         print "Using 2-vector HILO displacement texture with 
GL_NV_texture_shader"