Antonis Ryakiotakis
5e613198e5
This commit introduces a few ready made effects for the 3D viewport and OpenGL rendering. Included effects are Depth of Field, accessible from camera view and screen space ambient occlusion. Those effects can be turned on and tweaked from the shading panel in the 3D viewport. Off screen rendering will use the settings of the current camera. WIP documentation can be found here: http://wiki.blender.org/index.php/User:Psy-Fi/Framebuffer_Post-processing
48 lines
1.3 KiB
GLSL
48 lines
1.3 KiB
GLSL
vec3 calculate_view_space_normal(in vec3 viewposition)
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{
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vec3 normal = cross(normalize(dFdx(viewposition)),
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normalize(dFdy(viewposition)));
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normalize(normal);
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return normal;
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}
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/* simple depth reconstruction, see http://www.derschmale.com/2014/01/26/reconstructing-positions-from-the-depth-buffer
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* we change the factors from the article to fit the OpennGL model. */
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#ifdef PERSP_MATRIX
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/* perspective camera code */
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vec3 get_view_space_from_depth(in vec2 uvcoords, in vec3 viewvec_origin, in vec3 viewvec_diff, in float depth)
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{
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float d = 2.0 * depth - 1.0;
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float zview = -gl_ProjectionMatrix[3][2] / (d + gl_ProjectionMatrix[2][2]);
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return zview * (viewvec_origin + vec3(uvcoords, 0.0) * viewvec_diff);
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}
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vec4 get_view_space_z_from_depth(in vec4 near, in vec4 range, in vec4 depth)
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{
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vec4 d = 2.0 * depth - vec4(1.0);
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/* return positive value, so sign differs! */
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return vec4(gl_ProjectionMatrix[3][2]) / (d + vec4(gl_ProjectionMatrix[2][2]));
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}
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#else
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/* orthographic camera code */
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vec3 get_view_space_from_depth(in vec2 uvcoords, in vec3 viewvec_origin, in vec3 viewvec_diff, in float depth)
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{
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vec3 offset = vec3(uvcoords, depth);
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return vec3(viewvec_origin + offset * viewvec_diff);
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}
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vec4 get_view_space_z_from_depth(in vec4 near, in vec4 range, in vec4 depth)
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{
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return -(near + depth * range);
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}
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#endif
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