Viewport: create a shader to show depth images linearized

1 files changed, 22 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_image_depth_linear_frag.glsl b/source/blender/gpu/shaders/gpu_shader_image_depth_linear_frag.glsl
new file mode 100644
index 00000000000..7f76fbf03be
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_image_depth_linear_frag.glsl
@@ -0,0 +1,22 @@
+
+#if __VERSION__ == 120
+  varying vec2 texCoord_interp;
+  #define fragColor gl_FragColor
+#else
+  in vec2 texCoord_interp;
+  out vec4 fragColor;
+  #define texture2D texture
+#endif
+
+uniform float znear;
+uniform float zfar;
+uniform sampler2D image;
+
+void main()
+{
+	float depth = texture2D(image, texCoord_interp).r;
+
+	/* normalize */
+	fragColor.rgb = vec3((2.0f * znear) / (zfar + znear - (depth * (zfar - znear))));
+	fragColor.a = 1.0f;
+}