shadows, textures, resource managers... shaders...

[antikythera] / sdr / shadow.v.glsl

diff --git a/sdr/shadow.v.glsl b/sdr/shadow.v.glsl
new file mode 100644 (file)
index 0000000..8f9f045
--- /dev/null
+++ b/sdr/shadow.v.glsl
@@ -0,0 +1,27 @@
+uniform mat4 envmap_matrix;
+
+varying vec3 vdir, ldir[3], normal;
+varying vec4 shadow_tc;
+varying vec3 wdir;
+
+void main()
+{
+       gl_Position = ftransform();
+
+       vec3 vpos = (gl_ModelViewMatrix * gl_Vertex).xyz;
+       normal = gl_NormalMatrix * gl_Normal;
+       vdir = -vpos;
+       wdir = (envmap_matrix * vec4(vdir, 1.0)).xyz;   // bring back to world space
+       ldir[0] = gl_LightSource[0].position.xyz - vpos;
+       ldir[1] = gl_LightSource[1].position.xyz - vpos;
+       ldir[2] = gl_LightSource[2].position.xyz - vpos;
+       gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+
+       mat4 offmat = mat4(0.5, 0.0, 0.0, 0.0,
+                       0.0, 0.5, 0.0, 0.0,
+                       0.0, 0.0, 0.5, 0.0,
+                       0.5, 0.5, 0.5, 1.0);
+       mat4 tex_matrix = offmat * gl_TextureMatrix[1];
+
+       shadow_tc = tex_matrix * vec4(vpos, 1.0);
+}