173 lines
5.5 KiB
GLSL
173 lines
5.5 KiB
GLSL
[vertex]
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layout(location=0) in highp vec4 vertex_attrib;
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layout(location=4) in vec2 uv_in;
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out vec2 uv_interp;
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void main() {
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uv_interp = uv_in;
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gl_Position = vertex_attrib;
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}
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[fragment]
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//#define QUALIFIER uniform // some guy on the interweb says it may be faster with this
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#define QUALIFIER const
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#ifdef USE_25_SAMPLES
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const int kernel_size=25;
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QUALIFIER vec4 kernel[25] = vec4[] (
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vec4(0.530605, 0.613514, 0.739601, 0.0),
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vec4(0.000973794, 1.11862e-005, 9.43437e-007, -3.0),
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vec4(0.00333804, 7.85443e-005, 1.2945e-005, -2.52083),
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vec4(0.00500364, 0.00020094, 5.28848e-005, -2.08333),
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vec4(0.00700976, 0.00049366, 0.000151938, -1.6875),
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vec4(0.0094389, 0.00139119, 0.000416598, -1.33333),
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vec4(0.0128496, 0.00356329, 0.00132016, -1.02083),
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vec4(0.017924, 0.00711691, 0.00347194, -0.75),
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vec4(0.0263642, 0.0119715, 0.00684598, -0.520833),
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vec4(0.0410172, 0.0199899, 0.0118481, -0.333333),
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vec4(0.0493588, 0.0367726, 0.0219485, -0.1875),
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vec4(0.0402784, 0.0657244, 0.04631, -0.0833333),
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vec4(0.0211412, 0.0459286, 0.0378196, -0.0208333),
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vec4(0.0211412, 0.0459286, 0.0378196, 0.0208333),
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vec4(0.0402784, 0.0657244, 0.04631, 0.0833333),
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vec4(0.0493588, 0.0367726, 0.0219485, 0.1875),
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vec4(0.0410172, 0.0199899, 0.0118481, 0.333333),
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vec4(0.0263642, 0.0119715, 0.00684598, 0.520833),
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vec4(0.017924, 0.00711691, 0.00347194, 0.75),
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vec4(0.0128496, 0.00356329, 0.00132016, 1.02083),
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vec4(0.0094389, 0.00139119, 0.000416598, 1.33333),
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vec4(0.00700976, 0.00049366, 0.000151938, 1.6875),
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vec4(0.00500364, 0.00020094, 5.28848e-005, 2.08333),
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vec4(0.00333804, 7.85443e-005, 1.2945e-005, 2.52083),
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vec4(0.000973794, 1.11862e-005, 9.43437e-007, 3.0)
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);
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#endif //USE_25_SAMPLES
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#ifdef USE_17_SAMPLES
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const int kernel_size=17;
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QUALIFIER vec4 kernel[17] = vec4[](
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vec4(0.536343, 0.624624, 0.748867, 0.0),
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vec4(0.00317394, 0.000134823, 3.77269e-005, -2.0),
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vec4(0.0100386, 0.000914679, 0.000275702, -1.53125),
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vec4(0.0144609, 0.00317269, 0.00106399, -1.125),
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vec4(0.0216301, 0.00794618, 0.00376991, -0.78125),
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vec4(0.0347317, 0.0151085, 0.00871983, -0.5),
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vec4(0.0571056, 0.0287432, 0.0172844, -0.28125),
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vec4(0.0582416, 0.0659959, 0.0411329, -0.125),
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vec4(0.0324462, 0.0656718, 0.0532821, -0.03125),
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vec4(0.0324462, 0.0656718, 0.0532821, 0.03125),
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vec4(0.0582416, 0.0659959, 0.0411329, 0.125),
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vec4(0.0571056, 0.0287432, 0.0172844, 0.28125),
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vec4(0.0347317, 0.0151085, 0.00871983, 0.5),
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vec4(0.0216301, 0.00794618, 0.00376991, 0.78125),
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vec4(0.0144609, 0.00317269, 0.00106399, 1.125),
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vec4(0.0100386, 0.000914679, 0.000275702, 1.53125),
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vec4(0.00317394, 0.000134823, 3.77269e-005, 2.0)
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);
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#endif //USE_17_SAMPLES
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#ifdef USE_11_SAMPLES
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const int kernel_size=11;
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QUALIFIER vec4 kernel[11] = vec4[](
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vec4(0.560479, 0.669086, 0.784728, 0.0),
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vec4(0.00471691, 0.000184771, 5.07566e-005, -2.0),
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vec4(0.0192831, 0.00282018, 0.00084214, -1.28),
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vec4(0.03639, 0.0130999, 0.00643685, -0.72),
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vec4(0.0821904, 0.0358608, 0.0209261, -0.32),
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vec4(0.0771802, 0.113491, 0.0793803, -0.08),
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vec4(0.0771802, 0.113491, 0.0793803, 0.08),
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vec4(0.0821904, 0.0358608, 0.0209261, 0.32),
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vec4(0.03639, 0.0130999, 0.00643685, 0.72),
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vec4(0.0192831, 0.00282018, 0.00084214, 1.28),
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vec4(0.00471691, 0.000184771, 5.07565e-005, 2.0)
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);
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#endif //USE_11_SAMPLES
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uniform float max_radius;
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uniform float fovy;
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uniform float camera_z_far;
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uniform float camera_z_near;
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uniform vec2 dir;
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in vec2 uv_interp;
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uniform sampler2D source_diffuse; //texunit:0
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uniform sampler2D source_sss; //texunit:1
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uniform sampler2D source_depth; //texunit:2
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layout(location = 0) out vec4 frag_color;
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void main() {
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float strength = texture(source_sss,uv_interp).r;
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strength*=strength; //stored as sqrt
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// Fetch color of current pixel:
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vec4 base_color = texture(source_diffuse, uv_interp);
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if (strength>0.0) {
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// Fetch linear depth of current pixel:
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float depth = texture(source_depth, uv_interp).r * 2.0 - 1.0;
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depth = 2.0 * camera_z_near * camera_z_far / (camera_z_far + camera_z_near - depth * (camera_z_far - camera_z_near));
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depth=-depth;
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// Calculate the radius scale (1.0 for a unit plane sitting on the
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// projection window):
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float distance = 1.0 / tan(0.5 * fovy);
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float scale = distance / -depth; //remember depth is negative by default in OpenGL
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// Calculate the final step to fetch the surrounding pixels:
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vec2 step = max_radius * scale * dir;
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step *= strength; // Modulate it using the alpha channel.
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step *= 1.0 / 3.0; // Divide by 3 as the kernels range from -3 to 3.
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// Accumulate the center sample:
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vec3 color_accum = base_color.rgb;
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color_accum *= kernel[0].rgb;
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// Accumulate the other samples:
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for (int i = 1; i < kernel_size; i++) {
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// Fetch color and depth for current sample:
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vec2 offset = uv_interp + kernel[i].a * step;
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vec3 color = texture(source_diffuse, offset).rgb;
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#ifdef ENABLE_FOLLOW_SURFACE
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// If the difference in depth is huge, we lerp color back to "colorM":
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float depth_cmp = texture(source_depth, offset).r *2.0 - 1.0;
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depth_cmp = 2.0 * camera_z_near * camera_z_far / (camera_z_far + camera_z_near - depth_cmp * (camera_z_far - camera_z_near));
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depth_cmp=-depth_cmp;
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float s = clamp(300.0f * distance *
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max_radius * abs(depth - depth_cmp),0.0,1.0);
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color = mix(color, base_color.rgb, s);
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#endif
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// Accumulate:
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color_accum += kernel[i].rgb * color;
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}
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frag_color = vec4(color_accum,base_color.a); //keep alpha (used for SSAO)
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} else {
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frag_color = base_color;
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}
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}
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