113 lines
3.9 KiB
GLSL
113 lines
3.9 KiB
GLSL
/* clang-format off */
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#[modes]
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// Based on Dual filtering glow as explained in Marius Bjørge presentation at Siggraph 2015 "Bandwidth-Efficient Rendering"
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mode_filter = #define MODE_FILTER
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mode_downsample = #define MODE_DOWNSAMPLE
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mode_upsample = #define MODE_UPSAMPLE
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#[specializations]
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USE_MULTIVIEW = false
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#[vertex]
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layout(location = 0) in vec2 vertex_attrib;
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/* clang-format on */
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out vec2 uv_interp;
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void main() {
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uv_interp = vertex_attrib * 0.5 + 0.5;
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gl_Position = vec4(vertex_attrib, 1.0, 1.0);
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}
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/* clang-format off */
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#[fragment]
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/* clang-format on */
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#ifdef MODE_FILTER
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#ifdef USE_MULTIVIEW
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uniform sampler2DArray source_color; // texunit:0
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#else
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uniform sampler2D source_color; // texunit:0
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#endif // USE_MULTIVIEW
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uniform float view;
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uniform vec2 pixel_size;
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uniform float luminance_multiplier;
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uniform float glow_bloom;
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uniform float glow_hdr_threshold;
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uniform float glow_hdr_scale;
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uniform float glow_luminance_cap;
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#endif // MODE_FILTER
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#ifdef MODE_DOWNSAMPLE
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uniform sampler2D source_color; // texunit:0
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uniform vec2 pixel_size;
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#endif // MODE_DOWNSAMPLE
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#ifdef MODE_UPSAMPLE
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uniform sampler2D source_color; // texunit:0
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uniform vec2 pixel_size;
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#endif // MODE_UPSAMPLE
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in vec2 uv_interp;
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layout(location = 0) out vec4 frag_color;
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void main() {
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#ifdef MODE_FILTER
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// Note, we read from an image with double resolution, so we average those out
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#ifdef USE_MULTIVIEW
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vec2 half_pixel = pixel_size * 0.5;
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vec3 uv = vec3(uv_interp, view);
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vec3 color = textureLod(source_color, uv, 0.0).rgb * 4.0;
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color += textureLod(source_color, uv - vec3(half_pixel, 0.0), 0.0).rgb;
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color += textureLod(source_color, uv + vec3(half_pixel, 0.0), 0.0).rgb;
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color += textureLod(source_color, uv - vec3(half_pixel.x, -half_pixel.y, 0.0), 0.0).rgb;
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color += textureLod(source_color, uv + vec3(half_pixel.x, -half_pixel.y, 0.0), 0.0).rgb;
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#else
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vec2 half_pixel = pixel_size * 0.5;
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vec2 uv = uv_interp;
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vec3 color = textureLod(source_color, uv, 0.0).rgb * 4.0;
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color += textureLod(source_color, uv - half_pixel, 0.0).rgb;
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color += textureLod(source_color, uv + half_pixel, 0.0).rgb;
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color += textureLod(source_color, uv - vec2(half_pixel.x, -half_pixel.y), 0.0).rgb;
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color += textureLod(source_color, uv + vec2(half_pixel.x, -half_pixel.y), 0.0).rgb;
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#endif // USE_MULTIVIEW
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color /= luminance_multiplier * 8.0;
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float feedback_factor = max(color.r, max(color.g, color.b));
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float feedback = max(smoothstep(glow_hdr_threshold, glow_hdr_threshold + glow_hdr_scale, feedback_factor), glow_bloom);
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color = min(color * feedback, vec3(glow_luminance_cap));
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frag_color = vec4(luminance_multiplier * color, 1.0);
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#endif // MODE_FILTER
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#ifdef MODE_DOWNSAMPLE
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vec2 half_pixel = pixel_size * 0.5;
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vec4 color = textureLod(source_color, uv_interp, 0.0) * 4.0;
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color += textureLod(source_color, uv_interp - half_pixel, 0.0);
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color += textureLod(source_color, uv_interp + half_pixel, 0.0);
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color += textureLod(source_color, uv_interp - vec2(half_pixel.x, -half_pixel.y), 0.0);
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color += textureLod(source_color, uv_interp + vec2(half_pixel.x, -half_pixel.y), 0.0);
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frag_color = color / 8.0;
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#endif // MODE_DOWNSAMPLE
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#ifdef MODE_UPSAMPLE
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vec2 half_pixel = pixel_size * 0.5;
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vec4 color = textureLod(source_color, uv_interp + vec2(-half_pixel.x * 2.0, 0.0), 0.0);
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color += textureLod(source_color, uv_interp + vec2(-half_pixel.x, half_pixel.y), 0.0) * 2.0;
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color += textureLod(source_color, uv_interp + vec2(0.0, half_pixel.y * 2.0), 0.0);
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color += textureLod(source_color, uv_interp + vec2(half_pixel.x, half_pixel.y), 0.0) * 2.0;
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color += textureLod(source_color, uv_interp + vec2(half_pixel.x * 2.0, 0.0), 0.0);
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color += textureLod(source_color, uv_interp + vec2(half_pixel.x, -half_pixel.y), 0.0) * 2.0;
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color += textureLod(source_color, uv_interp + vec2(0.0, -half_pixel.y * 2.0), 0.0);
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color += textureLod(source_color, uv_interp + vec2(-half_pixel.x, -half_pixel.y), 0.0) * 2.0;
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frag_color = color / 12.0;
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#endif // MODE_UPSAMPLE
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}
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