From 425decdf7e9284d15aa726e3ae96b9942fb0e3ea Mon Sep 17 00:00:00 2001 From: IronClawTrem Date: Sun, 16 Feb 2020 03:40:06 +0000 Subject: create tremded branch --- src/renderergl2/glsl/shadowmask_fp.glsl | 143 ++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 src/renderergl2/glsl/shadowmask_fp.glsl (limited to 'src/renderergl2/glsl/shadowmask_fp.glsl') diff --git a/src/renderergl2/glsl/shadowmask_fp.glsl b/src/renderergl2/glsl/shadowmask_fp.glsl new file mode 100644 index 0000000..2b57e3b --- /dev/null +++ b/src/renderergl2/glsl/shadowmask_fp.glsl @@ -0,0 +1,143 @@ +uniform sampler2D u_ScreenDepthMap; + +uniform sampler2DShadow u_ShadowMap; +#if defined(USE_SHADOW_CASCADE) +uniform sampler2DShadow u_ShadowMap2; +uniform sampler2DShadow u_ShadowMap3; +uniform sampler2DShadow u_ShadowMap4; +#endif + +uniform mat4 u_ShadowMvp; +#if defined(USE_SHADOW_CASCADE) +uniform mat4 u_ShadowMvp2; +uniform mat4 u_ShadowMvp3; +uniform mat4 u_ShadowMvp4; +#endif + +uniform vec3 u_ViewOrigin; +uniform vec4 u_ViewInfo; // zfar / znear, zfar + +varying vec2 var_DepthTex; +varying vec3 var_ViewDir; + +// depth is GL_DEPTH_COMPONENT24 +// so the maximum error is 1.0 / 2^24 +#define DEPTH_MAX_ERROR 0.000000059604644775390625 + +// Input: It uses texture coords as the random number seed. +// Output: Random number: [0,1), that is between 0.0 and 0.999999... inclusive. +// Author: Michael Pohoreski +// Copyright: Copyleft 2012 :-) +// Source: http://stackoverflow.com/questions/5149544/can-i-generate-a-random-number-inside-a-pixel-shader + +float random( const vec2 p ) +{ + // We need irrationals for pseudo randomness. + // Most (all?) known transcendental numbers will (generally) work. + const vec2 r = vec2( + 23.1406926327792690, // e^pi (Gelfond's constant) + 2.6651441426902251); // 2^sqrt(2) (Gelfond-Schneider constant) + //return fract( cos( mod( 123456789., 1e-7 + 256. * dot(p,r) ) ) ); + return mod( 123456789., 1e-7 + 256. * dot(p,r) ); +} + +float PCF(const sampler2DShadow shadowmap, const vec2 st, const float dist) +{ + float mult; + float scale = 2.0 / r_shadowMapSize; + +#if 0 + // from http://http.developer.nvidia.com/GPUGems/gpugems_ch11.html + vec2 offset = vec2(greaterThan(fract(var_DepthTex.xy * r_FBufScale * 0.5), vec2(0.25))); + offset.y += offset.x; + if (offset.y > 1.1) offset.y = 0.0; + + mult = shadow2D(shadowmap, vec3(st + (offset + vec2(-1.5, 0.5)) * scale, dist)) + + shadow2D(shadowmap, vec3(st + (offset + vec2( 0.5, 0.5)) * scale, dist)) + + shadow2D(shadowmap, vec3(st + (offset + vec2(-1.5, -1.5)) * scale, dist)) + + shadow2D(shadowmap, vec3(st + (offset + vec2( 0.5, -1.5)) * scale, dist)); + + mult *= 0.25; +#endif + +#if defined(USE_SHADOW_FILTER) + float r = random(var_DepthTex.xy); + float sinr = sin(r) * scale; + float cosr = cos(r) * scale; + mat2 rmat = mat2(cosr, sinr, -sinr, cosr); + + mult = shadow2D(shadowmap, vec3(st + rmat * vec2(-0.7055767, 0.196515), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(0.3524343, -0.7791386), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(0.2391056, 0.9189604), dist)); + #if defined(USE_SHADOW_FILTER2) + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(-0.07580382, -0.09224417), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(0.5784913, -0.002528916), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(0.192888, 0.4064181), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(-0.6335801, -0.5247476), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(-0.5579782, 0.7491854), dist)); + mult += shadow2D(shadowmap, vec3(st + rmat * vec2(0.7320465, 0.6317794), dist)); + + mult *= 0.11111; + #else + mult *= 0.33333; + #endif +#else + mult = shadow2D(shadowmap, vec3(st, dist)); +#endif + + return mult; +} + +float getLinearDepth(sampler2D depthMap, vec2 tex, float zFarDivZNear) +{ + float sampleZDivW = texture2D(depthMap, tex).r - DEPTH_MAX_ERROR; + return 1.0 / mix(zFarDivZNear, 1.0, sampleZDivW); +} + +void main() +{ + float result; + + float depth = getLinearDepth(u_ScreenDepthMap, var_DepthTex, u_ViewInfo.x); + vec4 biasPos = vec4(u_ViewOrigin + var_ViewDir * (depth - 0.5 / u_ViewInfo.x), 1.0); + + vec4 shadowpos = u_ShadowMvp * biasPos; + +#if defined(USE_SHADOW_CASCADE) + if (all(lessThan(abs(shadowpos.xyz), vec3(abs(shadowpos.w))))) + { +#endif + shadowpos.xyz = shadowpos.xyz * (0.5 / shadowpos.w) + vec3(0.5); + result = PCF(u_ShadowMap, shadowpos.xy, shadowpos.z); +#if defined(USE_SHADOW_CASCADE) + } + else + { + shadowpos = u_ShadowMvp2 * biasPos; + + if (all(lessThan(abs(shadowpos.xyz), vec3(abs(shadowpos.w))))) + { + shadowpos.xyz = shadowpos.xyz * (0.5 / shadowpos.w) + vec3(0.5); + result = PCF(u_ShadowMap2, shadowpos.xy, shadowpos.z); + } + else + { + shadowpos = u_ShadowMvp3 * biasPos; + + if (all(lessThan(abs(shadowpos.xyz), vec3(abs(shadowpos.w))))) + { + shadowpos.xyz = shadowpos.xyz * (0.5 / shadowpos.w) + vec3(0.5); + result = PCF(u_ShadowMap3, shadowpos.xy, shadowpos.z); + } + else + { + shadowpos = u_ShadowMvp4 * biasPos; + shadowpos.xyz = shadowpos.xyz * (0.5 / shadowpos.w) + vec3(0.5); + result = PCF(u_ShadowMap4, shadowpos.xy, shadowpos.z); + } + } + } +#endif + + gl_FragColor = vec4(vec3(result), 1.0); +} -- cgit