renamed file

jdupuy · Jan 19, 2013 · abfd5e0 · abfd5e0
1 parent e3e805c
commit abfd5e0
Showing 1 changed file with 49 additions and 0 deletions.
diff --git a/whitecap_precompute.glsl b/whitecap_precompute.glsl
@@ -0,0 +1,49 @@
+#extension GL_EXT_gpu_shader4 : enable
+
+
+varying vec2 uv;	// texcoords
+
+#ifdef _VERTEX_
+void main() {
+    uv = gl_Vertex.zw;
+    gl_Position = vec4(gl_Vertex.xy, 0.0, 1.0);
+}
+
+#endif
+
+#ifdef _FRAGMENT_
+
+#define LAYER_JACOBIAN_XX 	5.0
+#define LAYER_JACOBIAN_YY	6.0
+#define LAYER_JACOBIAN_XY	7.0
+
+uniform sampler2DArray fftWavesSampler;
+uniform vec4 choppy;
+
+void main() {
+
+	// fftWavesSampler has 4 height values
+	// heights.r : Lx, Lz = x0
+	// heights.b : Lx, Lz = x1
+	// heights.b : Lx, Lz = x2
+	// heights.a : Lx, Lz = x3
+	// with x0 < x1 < x2 < x3
+	vec4 heights = texture2DArray(fftWavesSampler, vec3(uv, 0.0));
+
+	gl_FragData[0] = vec4(heights.x, heights.x * heights.x, heights.y, heights.y * heights.y);
+	gl_FragData[1] = vec4(heights.z, heights.z * heights.z, heights.w, heights.w * heights.w);
+
+	// store Jacobian coeff value and variance
+	vec4 Jxx = choppy*texture2DArray(fftWavesSampler, vec3(uv, LAYER_JACOBIAN_XX));
+	vec4 Jyy = choppy*texture2DArray(fftWavesSampler, vec3(uv, LAYER_JACOBIAN_YY));
+	vec4 Jxy = choppy*choppy*texture2DArray(fftWavesSampler, vec3(uv, LAYER_JACOBIAN_XY));
+
+	// Store partial jacobians
+	vec4 res = 0.25 + Jxx + Jyy + choppy*Jxx*Jyy - Jxy*Jxy;
+	vec4 res2 = res*res;
+	gl_FragData[2] = vec4(res.x, res2.x, res.y, res2.y);
+	gl_FragData[3] = vec4(res.z, res2.z, res.w, res2.w);
+
+}
+
+#endif