vpglsl: add some simple tests with function calls

[mesa.git] / progs / vpglsl / func.glsl

diff --git a/progs/vpglsl/func.glsl b/progs/vpglsl/func.glsl
new file mode 100644 (file)
index 0000000..0553988
--- /dev/null
+++ b/progs/vpglsl/func.glsl
@@ -0,0 +1,33 @@
+#version 120
+const int KernelSize = 16;
+uniform float KernelValue1f[KernelSize];
+
+
+float add_two(float a, float b)
+{
+    if (a > b)
+        return a - b;
+    else
+        return a + b;
+}
+
+vec4 func(vec4 x)
+{
+    int i;
+    vec4 tmp = gl_Color;
+    vec4 sum = x;
+
+    for (i = 0; i < KernelSize; ++i) {
+        sum = vec4( add_two(sum.x, KernelValue1f[i]) );
+    }
+    return sum;
+}
+
+void main(void)
+{
+    vec4 sum = vec4(0.0);
+
+    sum = func(sum);
+    gl_Position = gl_Vertex;
+    gl_FrontColor = sum;
+}