172 lines
4.8 KiB
GLSL
172 lines
4.8 KiB
GLSL
/* clang-format off */
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[vertex]
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layout(location = 0) in highp vec4 vertex_attrib;
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/* clang-format on */
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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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/* clang-format off */
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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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/* clang-format on */
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QUALIFIER vec2 kernel[25] = vec2[](
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vec2(0.530605, 0.0),
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vec2(0.000973794, -3.0),
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vec2(0.00333804, -2.52083),
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vec2(0.00500364, -2.08333),
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vec2(0.00700976, -1.6875),
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vec2(0.0094389, -1.33333),
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vec2(0.0128496, -1.02083),
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vec2(0.017924, -0.75),
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vec2(0.0263642, -0.520833),
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vec2(0.0410172, -0.333333),
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vec2(0.0493588, -0.1875),
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vec2(0.0402784, -0.0833333),
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vec2(0.0211412, -0.0208333),
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vec2(0.0211412, 0.0208333),
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vec2(0.0402784, 0.0833333),
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vec2(0.0493588, 0.1875),
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vec2(0.0410172, 0.333333),
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vec2(0.0263642, 0.520833),
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vec2(0.017924, 0.75),
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vec2(0.0128496, 1.02083),
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vec2(0.0094389, 1.33333),
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vec2(0.00700976, 1.6875),
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vec2(0.00500364, 2.08333),
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vec2(0.00333804, 2.52083),
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vec2(0.000973794, 3.0));
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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 vec2 kernel[17] = vec2[](
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vec2(0.536343, 0.0),
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vec2(0.00317394, -2.0),
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vec2(0.0100386, -1.53125),
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vec2(0.0144609, -1.125),
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vec2(0.0216301, -0.78125),
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vec2(0.0347317, -0.5),
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vec2(0.0571056, -0.28125),
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vec2(0.0582416, -0.125),
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vec2(0.0324462, -0.03125),
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vec2(0.0324462, 0.03125),
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vec2(0.0582416, 0.125),
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vec2(0.0571056, 0.28125),
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vec2(0.0347317, 0.5),
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vec2(0.0216301, 0.78125),
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vec2(0.0144609, 1.125),
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vec2(0.0100386, 1.53125),
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vec2(0.00317394, 2.0));
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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 vec2 kernel[11] = vec2[](
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vec2(0.560479, 0.0),
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vec2(0.00471691, -2.0),
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vec2(0.0192831, -1.28),
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vec2(0.03639, -0.72),
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vec2(0.0821904, -0.32),
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vec2(0.0771802, -0.08),
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vec2(0.0771802, 0.08),
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vec2(0.0821904, 0.32),
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vec2(0.03639, 0.72),
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vec2(0.0192831, 1.28),
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vec2(0.00471691, 2.0));
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#endif //USE_11_SAMPLES
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uniform float max_radius;
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uniform float camera_z_far;
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uniform float camera_z_near;
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uniform float unit_size;
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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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#ifdef USE_ORTHOGONAL_PROJECTION
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depth = ((depth + (camera_z_far + camera_z_near) / (camera_z_far - camera_z_near)) * (camera_z_far - camera_z_near)) / 2.0;
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float scale = unit_size; //remember depth is negative by default in OpenGL
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#else
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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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float scale = unit_size / depth; //remember depth is negative by default in OpenGL
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#endif
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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].x;
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#ifdef ENABLE_STRENGTH_WEIGHTING
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float color_weight = kernel[0].x;
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#endif
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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].y * 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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#ifdef USE_ORTHOGONAL_PROJECTION
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depth_cmp = ((depth_cmp + (camera_z_far + camera_z_near) / (camera_z_far - camera_z_near)) * (camera_z_far - camera_z_near)) / 2.0;
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#else
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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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#endif
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float s = clamp(300.0f * scale * 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 *= kernel[i].x;
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#ifdef ENABLE_STRENGTH_WEIGHTING
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float color_s = texture(source_sss, offset).r;
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color_weight += color_s * kernel[i].x;
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color *= color_s;
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#endif
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color_accum += color;
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}
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#ifdef ENABLE_STRENGTH_WEIGHTING
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color_accum /= color_weight;
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#endif
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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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