mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-27 22:27:15 +01:00
3a04d5adfe
On some hardware, modifying gl_FragColor multiple times can cause large performance drops. This PR writes to a standard temporary variable instead, and copies across to gl_FragColor once only at the end of the fragment shader. This could potentially lead to large gains in performance on affected hardware.
387 lines
11 KiB
GLSL
387 lines
11 KiB
GLSL
/* clang-format off */
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[vertex]
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#ifdef USE_GLES_OVER_GL
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#define lowp
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#define mediump
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#define highp
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#else
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precision highp float;
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precision highp int;
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#endif
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attribute vec2 vertex_attrib; // attrib:0
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/* clang-format on */
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attribute vec2 uv_in; // attrib:4
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varying vec2 uv_interp;
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void main() {
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gl_Position = vec4(vertex_attrib, 0.0, 1.0);
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uv_interp = uv_in;
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}
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/* clang-format off */
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[fragment]
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// texture2DLodEXT and textureCubeLodEXT are fragment shader specific.
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// Do not copy these defines in the vertex section.
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#ifndef USE_GLES_OVER_GL
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#ifdef GL_EXT_shader_texture_lod
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#extension GL_EXT_shader_texture_lod : enable
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#define texture2DLod(img, coord, lod) texture2DLodEXT(img, coord, lod)
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#define textureCubeLod(img, coord, lod) textureCubeLodEXT(img, coord, lod)
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#endif
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#endif // !USE_GLES_OVER_GL
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#ifdef GL_ARB_shader_texture_lod
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#extension GL_ARB_shader_texture_lod : enable
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#endif
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#if !defined(GL_EXT_shader_texture_lod) && !defined(GL_ARB_shader_texture_lod)
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#define texture2DLod(img, coord, lod) texture2D(img, coord, lod)
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#define textureCubeLod(img, coord, lod) textureCube(img, coord, lod)
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#endif
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// Allows the use of bitshift operators for bicubic upscale
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#ifdef GL_EXT_gpu_shader4
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#extension GL_EXT_gpu_shader4 : enable
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#endif
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#ifdef USE_GLES_OVER_GL
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#define lowp
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#define mediump
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#define highp
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#else
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#if defined(USE_HIGHP_PRECISION)
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precision highp float;
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precision highp int;
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#else
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precision mediump float;
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precision mediump int;
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#endif
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#endif
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#include "stdlib.glsl"
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varying vec2 uv_interp;
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/* clang-format on */
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uniform highp sampler2D source; //texunit:0
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#if defined(USE_GLOW_LEVEL1) || defined(USE_GLOW_LEVEL2) || defined(USE_GLOW_LEVEL3) || defined(USE_GLOW_LEVEL4) || defined(USE_GLOW_LEVEL5) || defined(USE_GLOW_LEVEL6) || defined(USE_GLOW_LEVEL7)
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#define USING_GLOW // only use glow when at least one glow level is selected
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#ifdef USE_MULTI_TEXTURE_GLOW
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uniform highp sampler2D source_glow1; //texunit:2
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uniform highp sampler2D source_glow2; //texunit:3
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uniform highp sampler2D source_glow3; //texunit:4
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uniform highp sampler2D source_glow4; //texunit:5
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uniform highp sampler2D source_glow5; //texunit:6
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uniform highp sampler2D source_glow6; //texunit:7
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#ifdef USE_GLOW_LEVEL7
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uniform highp sampler2D source_glow7; //texunit:8
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#endif
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#else
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uniform highp sampler2D source_glow; //texunit:2
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#endif
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uniform highp float glow_intensity;
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#endif
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#ifdef USE_BCS
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uniform vec3 bcs;
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#endif
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#ifdef USE_FXAA
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uniform vec2 pixel_size;
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#endif
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#ifdef USE_SHARPENING
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uniform float sharpen_intensity;
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#endif
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#ifdef USE_COLOR_CORRECTION
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uniform sampler2D color_correction; //texunit:1
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#endif
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#ifdef GL_EXT_gpu_shader4
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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 (1.0 / 6.0) * (a * (a * (-a + 3.0) - 3.0) + 1.0);
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}
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float w1(float a) {
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return (1.0 / 6.0) * (a * a * (3.0 * a - 6.0) + 4.0);
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}
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float w2(float a) {
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return (1.0 / 6.0) * (a * (a * (-3.0 * a + 3.0) + 3.0) + 1.0);
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}
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float w3(float a) {
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return (1.0 / 6.0) * (a * a * a);
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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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float g1(float a) {
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return w2(a) + w3(a);
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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 -1.0 + w1(a) / (w0(a) + w1(a));
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}
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float h1(float a) {
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return 1.0 + w3(a) / (w2(a) + w3(a));
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}
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uniform ivec2 glow_texture_size;
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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(glow_texture_size >> p_lod);
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vec2 texel_size = vec2(1.0) / tex_size;
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uv = uv * tex_size + vec2(0.5);
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vec2 iuv = floor(uv);
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vec2 fuv = fract(uv);
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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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vec2 p0 = (vec2(iuv.x + h0x, iuv.y + h0y) - vec2(0.5)) * texel_size;
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vec2 p1 = (vec2(iuv.x + h1x, iuv.y + h0y) - vec2(0.5)) * texel_size;
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vec2 p2 = (vec2(iuv.x + h0x, iuv.y + h1y) - vec2(0.5)) * texel_size;
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vec2 p3 = (vec2(iuv.x + h1x, iuv.y + h1y) - vec2(0.5)) * texel_size;
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return (g0(fuv.y) * (g0x * texture2DLod(tex, p0, lod) + g1x * texture2DLod(tex, p1, lod))) +
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(g1(fuv.y) * (g0x * texture2DLod(tex, p2, lod) + g1x * texture2DLod(tex, p3, lod)));
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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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#else //!USE_GLOW_FILTER_BICUBIC
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#define GLOW_TEXTURE_SAMPLE(m_tex, m_uv, m_lod) texture2DLod(m_tex, m_uv, float(m_lod))
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#endif //USE_GLOW_FILTER_BICUBIC
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#else //!GL_EXT_gpu_shader4
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#define GLOW_TEXTURE_SAMPLE(m_tex, m_uv, m_lod) texture2DLod(m_tex, m_uv, float(m_lod))
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#endif //GL_EXT_gpu_shader4
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vec4 apply_glow(vec4 color, vec3 glow) { // apply glow using the selected blending mode
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#ifdef USE_GLOW_REPLACE
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color.rgb = glow;
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#endif
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#ifdef USE_GLOW_SCREEN
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color.rgb = max((color.rgb + glow) - (color.rgb * glow), vec3(0.0));
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#endif
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#ifdef USE_GLOW_SOFTLIGHT
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glow = glow * vec3(0.5) + vec3(0.5);
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color.r = (glow.r <= 0.5) ? (color.r - (1.0 - 2.0 * glow.r) * color.r * (1.0 - color.r)) : (((glow.r > 0.5) && (color.r <= 0.25)) ? (color.r + (2.0 * glow.r - 1.0) * (4.0 * color.r * (4.0 * color.r + 1.0) * (color.r - 1.0) + 7.0 * color.r)) : (color.r + (2.0 * glow.r - 1.0) * (sqrt(color.r) - color.r)));
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color.g = (glow.g <= 0.5) ? (color.g - (1.0 - 2.0 * glow.g) * color.g * (1.0 - color.g)) : (((glow.g > 0.5) && (color.g <= 0.25)) ? (color.g + (2.0 * glow.g - 1.0) * (4.0 * color.g * (4.0 * color.g + 1.0) * (color.g - 1.0) + 7.0 * color.g)) : (color.g + (2.0 * glow.g - 1.0) * (sqrt(color.g) - color.g)));
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color.b = (glow.b <= 0.5) ? (color.b - (1.0 - 2.0 * glow.b) * color.b * (1.0 - color.b)) : (((glow.b > 0.5) && (color.b <= 0.25)) ? (color.b + (2.0 * glow.b - 1.0) * (4.0 * color.b * (4.0 * color.b + 1.0) * (color.b - 1.0) + 7.0 * color.b)) : (color.b + (2.0 * glow.b - 1.0) * (sqrt(color.b) - color.b)));
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#endif
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#if !defined(USE_GLOW_SCREEN) && !defined(USE_GLOW_SOFTLIGHT) && !defined(USE_GLOW_REPLACE) // no other selected -> additive
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color.rgb += glow;
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#endif
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#ifndef USE_GLOW_SOFTLIGHT // softlight has no effect on black color
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// compute the alpha from glow
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float a = max(max(glow.r, glow.g), glow.b);
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color.a = a + color.a * (1.0 - a);
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if (color.a == 0.0) {
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color.rgb = vec3(0.0);
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} else if (color.a < 1.0) {
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color.rgb /= color.a;
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}
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#endif
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return color;
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}
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vec3 apply_bcs(vec3 color, vec3 bcs) {
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color = mix(vec3(0.0), color, bcs.x);
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color = mix(vec3(0.5), color, bcs.y);
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color = mix(vec3(dot(vec3(1.0), color) * 0.33333), color, bcs.z);
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return color;
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}
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vec3 apply_color_correction(vec3 color, sampler2D correction_tex) {
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color.r = texture2D(correction_tex, vec2(color.r, 0.0)).r;
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color.g = texture2D(correction_tex, vec2(color.g, 0.0)).g;
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color.b = texture2D(correction_tex, vec2(color.b, 0.0)).b;
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return color;
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}
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vec4 apply_fxaa(vec4 color, vec2 uv_interp, vec2 pixel_size) {
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const float FXAA_REDUCE_MIN = (1.0 / 128.0);
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const float FXAA_REDUCE_MUL = (1.0 / 8.0);
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const float FXAA_SPAN_MAX = 8.0;
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const vec3 luma = vec3(0.299, 0.587, 0.114);
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vec4 rgbNW = texture2DLod(source, uv_interp + vec2(-1.0, -1.0) * pixel_size, 0.0);
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vec4 rgbNE = texture2DLod(source, uv_interp + vec2(1.0, -1.0) * pixel_size, 0.0);
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vec4 rgbSW = texture2DLod(source, uv_interp + vec2(-1.0, 1.0) * pixel_size, 0.0);
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vec4 rgbSE = texture2DLod(source, uv_interp + vec2(1.0, 1.0) * pixel_size, 0.0);
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vec3 rgbM = color.rgb;
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#ifdef DISABLE_ALPHA
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float lumaNW = dot(rgbNW.rgb, luma);
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float lumaNE = dot(rgbNE.rgb, luma);
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float lumaSW = dot(rgbSW.rgb, luma);
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float lumaSE = dot(rgbSE.rgb, luma);
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float lumaM = dot(rgbM, luma);
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#else
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float lumaNW = dot(rgbNW.rgb, luma) - ((1.0 - rgbNW.a) / 8.0);
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float lumaNE = dot(rgbNE.rgb, luma) - ((1.0 - rgbNE.a) / 8.0);
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float lumaSW = dot(rgbSW.rgb, luma) - ((1.0 - rgbSW.a) / 8.0);
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float lumaSE = dot(rgbSE.rgb, luma) - ((1.0 - rgbSE.a) / 8.0);
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float lumaM = dot(rgbM, luma) - (color.a / 8.0);
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#endif
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float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));
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float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));
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vec2 dir;
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dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
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dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE));
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float dirReduce = max((lumaNW + lumaNE + lumaSW + lumaSE) *
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(0.25 * FXAA_REDUCE_MUL),
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FXAA_REDUCE_MIN);
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float rcpDirMin = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce);
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dir = min(vec2(FXAA_SPAN_MAX, FXAA_SPAN_MAX),
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max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX),
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dir * rcpDirMin)) *
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pixel_size;
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vec4 rgbA = 0.5 * (texture2DLod(source, uv_interp + dir * (1.0 / 3.0 - 0.5), 0.0) + texture2DLod(source, uv_interp + dir * (2.0 / 3.0 - 0.5), 0.0));
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vec4 rgbB = rgbA * 0.5 + 0.25 * (texture2DLod(source, uv_interp + dir * -0.5, 0.0) + texture2DLod(source, uv_interp + dir * 0.5, 0.0));
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#ifdef DISABLE_ALPHA
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float lumaB = dot(rgbB.rgb, luma);
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vec4 color_output = ((lumaB < lumaMin) || (lumaB > lumaMax)) ? rgbA : rgbB;
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return vec4(color_output.rgb, 1.0);
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#else
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float lumaB = dot(rgbB.rgb, luma) - ((1.0 - rgbB.a) / 8.0);
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vec4 color_output = ((lumaB < lumaMin) || (lumaB > lumaMax)) ? rgbA : rgbB;
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if (color_output.a == 0.0) {
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color_output.rgb = vec3(0.0);
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} else if (color_output.a < 1.0) {
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color_output.rgb /= color_output.a;
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}
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return color_output;
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#endif
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}
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void main() {
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vec4 color = texture2DLod(source, uv_interp, 0.0);
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#ifdef DISABLE_ALPHA
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color.a = 1.0;
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#endif
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#ifdef USE_FXAA
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color = apply_fxaa(color, uv_interp, pixel_size);
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#endif
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// Glow
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#ifdef USING_GLOW
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vec3 glow = vec3(0.0);
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#ifdef USE_MULTI_TEXTURE_GLOW
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#ifdef USE_GLOW_LEVEL1
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glow += GLOW_TEXTURE_SAMPLE(source_glow1, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL2
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glow += GLOW_TEXTURE_SAMPLE(source_glow2, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL3
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glow += GLOW_TEXTURE_SAMPLE(source_glow3, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL4
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glow += GLOW_TEXTURE_SAMPLE(source_glow4, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL5
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glow += GLOW_TEXTURE_SAMPLE(source_glow5, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL6
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glow += GLOW_TEXTURE_SAMPLE(source_glow6, uv_interp, 0).rgb;
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#ifdef USE_GLOW_LEVEL7
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glow += GLOW_TEXTURE_SAMPLE(source_glow7, uv_interp, 0).rgb;
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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#else
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#ifdef USE_GLOW_LEVEL1
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 1).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL2
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 2).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL3
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 3).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL4
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 4).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL5
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 5).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL6
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 6).rgb;
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#endif
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#ifdef USE_GLOW_LEVEL7
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glow += GLOW_TEXTURE_SAMPLE(source_glow, uv_interp, 7).rgb;
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#endif
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#endif //USE_MULTI_TEXTURE_GLOW
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glow *= glow_intensity;
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color = apply_glow(color, glow);
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#endif
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// Additional effects
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#ifdef USE_BCS
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color.rgb = apply_bcs(color.rgb, bcs);
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#endif
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#ifdef USE_COLOR_CORRECTION
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color.rgb = apply_color_correction(color.rgb, color_correction);
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#endif
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#ifdef DISABLE_ALPHA
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color.a = 1.0;
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#endif
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gl_FragColor = color;
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}
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