UNPKG

playcanvas

Version:

PlayCanvas WebGL game engine

playcanvas.com

playcanvas/engine

3 lines (2 loc) • 1.67 kB
1
2
3
declare const _default: "\n\n#ifndef DITHER_NONE\n #include \"bayerPS\"\n #include \"opacityDitherPS\"\n varying float id;\n#endif\n\n#ifdef PICK_PASS\n #include \"pickPS\"\n#endif\n\n#if defined(SHADOW_PASS) || defined(PICK_PASS) || defined(PREPASS_PASS)\n uniform float alphaClip;\n#endif\n\n#ifdef PREPASS_PASS\n varying float vLinearDepth;\n #include \"floatAsUintPS\"\n#endif\n\n// Fast approximate e^x based on https://nic.schraudolph.org/pubs/Schraudolph99.pdf\nconst float EXP_A = 12102203.0; // \u2248 2^23 / ln(2)\nconst int EXP_BC_RMS = 1064866808; // (127 << 23) - 60801 * 8\nfloat fastExp(float x) {\n int i = int(EXP_A * x) + EXP_BC_RMS;\n return intBitsToFloat(i);\n}\n\nvarying mediump vec2 gaussianUV;\nvarying mediump vec4 gaussianColor;\n\nvoid main(void) {\n mediump float A = dot(gaussianUV, gaussianUV);\n if (A > 1.0) {\n discard;\n }\n\n // evaluate alpha\n mediump float alpha = fastExp(-A * 4.0) * gaussianColor.a;\n\n #if defined(SHADOW_PASS) || defined(PICK_PASS) || defined(PREPASS_PASS)\n if (alpha < alphaClip) {\n discard;\n }\n #endif\n\n #ifdef PICK_PASS\n\n gl_FragColor = getPickOutput();\n\n #elif SHADOW_PASS\n\n gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);\n\n #elif PREPASS_PASS\n\n gl_FragColor = float2vec4(vLinearDepth);\n\n #else\n if (alpha < 1.0 / 255.0) {\n discard;\n }\n\n #ifndef DITHER_NONE\n opacityDither(alpha, id * 0.013);\n #endif\n\n gl_FragColor = vec4(gaussianColor.xyz * alpha, alpha);\n #endif\n}\n"; export default _default;