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+/* clang-format off */
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+[vertex]
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+/* clang-format on */
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+
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+#version 450
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+
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+/* clang-format off */
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+VERSION_DEFINES
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+/* clang-format on */
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+
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+layout(location = 0) out vec2 uv_interp;
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+
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+void main() {
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+
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+ vec2 base_arr[4] = vec2[](vec2(0.0,0.0),vec2(0.0,1.0),vec2(1.0,1.0),vec2(1.0,0.0));
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+ uv_interp = base_arr[gl_VertexIndex];
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+ gl_Position = vec4( uv_interp *2.0 - 1.0, 0.0, 1.0);
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+}
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+
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+/* clang-format off */
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+[fragment]
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+
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+/* clang-format on */
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+
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+
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+#version 450
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+
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+/* clang-format off */
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+VERSION_DEFINES
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+/* clang-format on */
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+
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+layout(location =0) in vec2 uv_interp;
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+
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+layout( set=0, binding=0 ) uniform sampler2D source_color;
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+layout( set=1, binding=0 ) uniform sampler2D source_auto_exposure;
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+layout( set=2, binding=0 ) uniform sampler2D source_glow;
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+layout( set=3, binding=0 ) uniform sampler3D color_correction;
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+
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+layout(push_constant, binding = 1, std430) uniform Params {
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+ vec3 bcs;
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+ bool use_bcs;
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+
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+ bool use_glow;
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+ bool use_auto_exposure;
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+ bool use_color_correction;
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+ uint tonemapper;
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+
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+ uvec2 glow_texture_size;
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+
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+ float glow_intensity;
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+ uint glow_level_flags;
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+ uint glow_mode;
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+
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+ float exposure;
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+ float white;
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+ float auto_exposure_grey;
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+
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+} params;
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+
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+layout(location = 0) out vec4 frag_color;
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+
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+#ifdef USE_GLOW_FILTER_BICUBIC
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+// w0, w1, w2, and w3 are the four cubic B-spline basis functions
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+float w0(float a) {
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+ return (1.0f / 6.0f) * (a * (a * (-a + 3.0f) - 3.0f) + 1.0f);
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+}
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+
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+float w1(float a) {
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+ return (1.0f / 6.0f) * (a * a * (3.0f * a - 6.0f) + 4.0f);
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+}
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+
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+float w2(float a) {
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+ return (1.0f / 6.0f) * (a * (a * (-3.0f * a + 3.0f) + 3.0f) + 1.0f);
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+}
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+
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+float w3(float a) {
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+ return (1.0f / 6.0f) * (a * a * a);
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+}
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+
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+// g0 and g1 are the two amplitude functions
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+float g0(float a) {
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+ return w0(a) + w1(a);
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+}
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+
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+float g1(float a) {
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+ return w2(a) + w3(a);
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+}
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+
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+// h0 and h1 are the two offset functions
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+float h0(float a) {
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+ return -1.0f + w1(a) / (w0(a) + w1(a));
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+}
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+
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+float h1(float a) {
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+ return 1.0f + w3(a) / (w2(a) + w3(a));
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+}
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+
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+
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+vec4 texture2D_bicubic(sampler2D tex, vec2 uv, int p_lod) {
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+ float lod = float(p_lod);
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+ vec2 tex_size = vec2(params.glow_texture_size >> p_lod);
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+ vec2 pixel_size = vec2(1.0f) / tex_size;
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+
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+ uv = uv * tex_size + vec2(0.5f);
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+
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+ vec2 iuv = floor(uv);
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+ vec2 fuv = fract(uv);
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+
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+ float g0x = g0(fuv.x);
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+ float g1x = g1(fuv.x);
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+ float h0x = h0(fuv.x);
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+ float h1x = h1(fuv.x);
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+ float h0y = h0(fuv.y);
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+ float h1y = h1(fuv.y);
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+
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+ vec2 p0 = (vec2(iuv.x + h0x, iuv.y + h0y) - vec2(0.5f)) * pixel_size;
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+ vec2 p1 = (vec2(iuv.x + h1x, iuv.y + h0y) - vec2(0.5f)) * pixel_size;
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+ vec2 p2 = (vec2(iuv.x + h0x, iuv.y + h1y) - vec2(0.5f)) * pixel_size;
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+ vec2 p3 = (vec2(iuv.x + h1x, iuv.y + h1y) - vec2(0.5f)) * pixel_size;
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+
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+ return (g0(fuv.y) * (g0x * textureLod(tex, p0, lod) + g1x * textureLod(tex, p1, lod))) +
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+ (g1(fuv.y) * (g0x * textureLod(tex, p2, lod) + g1x * textureLod(tex, p3, lod)));
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+}
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+
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+#define GLOW_TEXTURE_SAMPLE(m_tex, m_uv, m_lod) texture2D_bicubic(m_tex, m_uv, m_lod)
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+
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+#else
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+
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+#define GLOW_TEXTURE_SAMPLE(m_tex, m_uv, m_lod) textureLod(m_tex, m_uv, float(m_lod))
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+
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+#endif
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+
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+vec3 tonemap_filmic(vec3 color, float white) {
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+ // exposure bias: input scale (color *= bias, white *= bias) to make the brightness consistent with other tonemappers
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+ // also useful to scale the input to the range that the tonemapper is designed for (some require very high input values)
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+ // has no effect on the curve's general shape or visual properties
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+ const float exposure_bias = 2.0f;
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+ const float A = 0.22f * exposure_bias * exposure_bias; // bias baked into constants for performance
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+ const float B = 0.30f * exposure_bias;
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+ const float C = 0.10f;
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+ const float D = 0.20f;
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+ const float E = 0.01f;
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+ const float F = 0.30f;
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+
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+ vec3 color_tonemapped = ((color * (A * color + C * B) + D * E) / (color * (A * color + B) + D * F)) - E / F;
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+ float white_tonemapped = ((white * (A * white + C * B) + D * E) / (white * (A * white + B) + D * F)) - E / F;
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+
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+ return color_tonemapped / white_tonemapped, vec3(0.0f), vec3(1.0f);
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+}
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+
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+vec3 tonemap_aces(vec3 color, float white) {
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+ const float exposure_bias = 0.85f;
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+ const float A = 2.51f * exposure_bias * exposure_bias;
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+ const float B = 0.03f * exposure_bias;
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+ const float C = 2.43f * exposure_bias * exposure_bias;
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+ const float D = 0.59f * exposure_bias;
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+ const float E = 0.14f;
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+
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+ vec3 color_tonemapped = (color * (A * color + B)) / (color * (C * color + D) + E);
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+ float white_tonemapped = (white * (A * white + B)) / (white * (C * white + D) + E);
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+
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+ return color_tonemapped / white_tonemapped, vec3(0.0f), vec3(1.0f);
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+}
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+
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+vec3 tonemap_reinhard(vec3 color, float white) {
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+ return (white * color + color) / (color * white + white);
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+}
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+
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+vec3 linear_to_srgb(vec3 color) { // convert linear rgb to srgb, assumes clamped input in range [0;1]
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+ const vec3 a = vec3(0.055f);
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+ return mix((vec3(1.0f) + a) * pow(color.rgb, vec3(1.0f / 2.4f)) - a, 12.92f * color.rgb, lessThan(color.rgb, vec3(0.0031308f)));
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+}
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+
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+#define TONEMAPPER_LINEAR 0
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+#define TONEMAPPER_REINHARD 1
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+#define TONEMAPPER_FILMIC 2
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+#define TONEMAPPER_ACES 3
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+
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+vec3 apply_tonemapping(vec3 color, float white) { // inputs are LINEAR, always outputs clamped [0;1] color
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+
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+ if (params.tonemapper==TONEMAPPER_LINEAR) {
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+ return color;
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+ } else if (params.tonemapper==TONEMAPPER_REINHARD) {
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+ return tonemap_reinhard(color, white);
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+ } else if (params.tonemapper==TONEMAPPER_FILMIC) {
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+ return tonemap_filmic(color, white);
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+ } else { //aces
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+ return tonemap_aces(color, white);
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+ }
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+}
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+
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+vec3 gather_glow(sampler2D tex, vec2 uv) { // sample all selected glow levels
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+ vec3 glow = vec3(0.0f);
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+
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+ if (bool(params.glow_level_flags&(1<<0))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 1).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<1))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 2).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<2))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 3).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<3))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 4).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<4))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 5).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<5))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 6).rgb;
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+ }
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+
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+ if (bool(params.glow_level_flags&(1<<6))) {
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+ glow += GLOW_TEXTURE_SAMPLE(tex, uv, 7).rgb;
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+ }
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+
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+ return glow;
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+}
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+
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+#define GLOW_MODE_ADD 0
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+#define GLOW_MODE_SCREEN 1
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+#define GLOW_MODE_SOFTLIGHT 2
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+#define GLOW_MODE_REPLACE 3
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+
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+vec3 apply_glow(vec3 color, vec3 glow) { // apply glow using the selected blending mode
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+ if (params.glow_mode==GLOW_MODE_ADD) {
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+ return color + glow;
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+ } else if (params.glow_mode==GLOW_MODE_SCREEN) {
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+ //need color clamping
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+ color = clamp(color,0.0,1.0);
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+ glow = clamp(glow,0.0,1.0);
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+
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+ return max((color + glow) - (color * glow), vec3(0.0));
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+ } else if ( params.glow_mode==GLOW_MODE_SOFTLIGHT) {
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+ //need color clamping
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+ color = clamp(color,0.0,1.0);
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+ glow = clamp(glow,0.0,1.0);
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+
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+ glow = glow * vec3(0.5f) + vec3(0.5f);
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+
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+ color.r = (glow.r <= 0.5f) ? (color.r - (1.0f - 2.0f * glow.r) * color.r * (1.0f - color.r)) : (((glow.r > 0.5f) && (color.r <= 0.25f)) ? (color.r + (2.0f * glow.r - 1.0f) * (4.0f * color.r * (4.0f * color.r + 1.0f) * (color.r - 1.0f) + 7.0f * color.r)) : (color.r + (2.0f * glow.r - 1.0f) * (sqrt(color.r) - color.r)));
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+ color.g = (glow.g <= 0.5f) ? (color.g - (1.0f - 2.0f * glow.g) * color.g * (1.0f - color.g)) : (((glow.g > 0.5f) && (color.g <= 0.25f)) ? (color.g + (2.0f * glow.g - 1.0f) * (4.0f * color.g * (4.0f * color.g + 1.0f) * (color.g - 1.0f) + 7.0f * color.g)) : (color.g + (2.0f * glow.g - 1.0f) * (sqrt(color.g) - color.g)));
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+ color.b = (glow.b <= 0.5f) ? (color.b - (1.0f - 2.0f * glow.b) * color.b * (1.0f - color.b)) : (((glow.b > 0.5f) && (color.b <= 0.25f)) ? (color.b + (2.0f * glow.b - 1.0f) * (4.0f * color.b * (4.0f * color.b + 1.0f) * (color.b - 1.0f) + 7.0f * color.b)) : (color.b + (2.0f * glow.b - 1.0f) * (sqrt(color.b) - color.b)));
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+ return color;
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+ } else { //replace
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+ return glow;
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+ }
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+}
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+
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+vec3 apply_bcs(vec3 color, vec3 bcs) {
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+ color = mix(vec3(0.0f), color, bcs.x);
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+ color = mix(vec3(0.5f), color, bcs.y);
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+ color = mix(vec3(dot(vec3(1.0f), color) * 0.33333f), color, bcs.z);
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+
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+ return color;
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+}
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+
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+vec3 apply_color_correction(vec3 color, sampler3D correction_tex) {
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+ return texture(correction_tex,color).rgb;
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+}
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+
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+void main() {
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+ vec3 color = textureLod(source_color, uv_interp, 0.0f).rgb;
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+
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+ // Exposure
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+
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+ if (params.use_auto_exposure) {
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+ color /= texelFetch(source_auto_exposure, ivec2(0, 0), 0).r / params.auto_exposure_grey;
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+ }
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+
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+ color *= params.exposure;
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+
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+ // Early Tonemap & SRGB Conversion
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+
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+ color = apply_tonemapping(color, params.white);
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+
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+ color = linear_to_srgb(color); // regular linear -> SRGB conversion
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+
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+ // Glow
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+
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+ if (params.use_glow) {
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+
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+ vec3 glow = gather_glow(source_glow, uv_interp) * params.glow_intensity;
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+
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+ // high dynamic range -> SRGB
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+ glow = apply_tonemapping(glow, params.white);
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+ glow = linear_to_srgb(glow);
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+
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+ color = apply_glow(color, glow);
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+ }
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+
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+ // Additional effects
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+
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+ if (params.use_bcs) {
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+ color = apply_bcs(color, params.bcs);
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+ }
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+
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+ if (params.use_color_correction) {
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+ color = apply_color_correction(color, color_correction);
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+ }
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+
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+ frag_color = vec4(color, 1.0f);
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+}
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Juan Linietsky