1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/gles2/shaders/cube_to_dp.glsl b/drivers/gles2/shaders/cube_to_dp.glsl
new file mode 100644
index 0000000000..5ffc78c0b9
--- /dev/null
+++ b/drivers/gles2/shaders/cube_to_dp.glsl
@@ -0,0 +1,79 @@
+[vertex]
+
+
+layout(location=0) in highp vec4 vertex_attrib;
+layout(location=4) in vec2 uv_in;
+
+out vec2 uv_interp;
+
+void main() {
+
+	uv_interp = uv_in;
+	gl_Position = vertex_attrib;
+}
+
+[fragment]
+
+
+uniform highp samplerCube source_cube; //texunit:0
+in vec2 uv_interp;
+
+uniform bool z_flip;
+uniform highp float z_far;
+uniform highp float z_near;
+uniform highp float bias;
+
+void main() {
+
+	highp vec3 normal = vec3( uv_interp * 2.0 - 1.0, 0.0 );
+/*
+	if(z_flip) {
+		normal.z = 0.5 - 0.5*((normal.x * normal.x) + (normal.y * normal.y));
+	} else {
+		normal.z = -0.5 + 0.5*((normal.x * normal.x) + (normal.y * normal.y));
+	}
+*/
+
+	//normal.z = sqrt(1.0-dot(normal.xy,normal.xy));
+	//normal.xy*=1.0+normal.z;
+
+	normal.z = 0.5 - 0.5*((normal.x * normal.x) + (normal.y * normal.y));
+	normal = normalize(normal);
+
+/*
+	normal.z=0.5;
+	normal=normalize(normal);
+*/
+	if (!z_flip) {
+		normal.z=-normal.z;
+	}
+
+	//normal = normalize(vec3( uv_interp * 2.0 - 1.0, 1.0 ));
+	float depth = texture(source_cube,normal).r;
+
+	// absolute values for direction cosines, bigger value equals closer to basis axis
+	vec3 unorm = abs(normal);
+
+	if ( (unorm.x >= unorm.y) && (unorm.x >= unorm.z) ) {
+	    // x code
+	    unorm = normal.x > 0.0 ?  vec3( 1.0, 0.0, 0.0 ) : vec3( -1.0, 0.0, 0.0 ) ;
+	} else if ( (unorm.y > unorm.x) && (unorm.y >= unorm.z) ) {
+	    // y code
+	    unorm = normal.y > 0.0 ?  vec3( 0.0, 1.0, 0.0 ) :  vec3( 0.0, -1.0, 0.0 ) ;
+	} else if ( (unorm.z > unorm.x) && (unorm.z > unorm.y) ) {
+	    // z code
+	    unorm = normal.z > 0.0 ?  vec3( 0.0, 0.0, 1.0 ) :  vec3( 0.0, 0.0, -1.0 ) ;
+	} else {
+	    // oh-no we messed up code
+	    // has to be
+	    unorm = vec3( 1.0, 0.0, 0.0 );
+	}
+
+	float depth_fix = 1.0 / dot(normal,unorm);
+
+
+	depth = 2.0 * depth - 1.0;
+	float linear_depth = 2.0 * z_near * z_far / (z_far + z_near - depth * (z_far - z_near));
+	gl_FragDepth = (linear_depth*depth_fix+bias) / z_far;
+}
+