use texture gather emulation for the shadowmap sampler path, and use it by default...

[xonotic/darkplaces.git] / shader_glsl.h

diff --git a/shader_glsl.h b/shader_glsl.h
index d3b258de8e033c699094524f680d8d8692ac523c..dbc19d5747620ff649f7bc23bf1016c6e26cbaea 100644 (file)
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -883,9 +883,13 @@
 "#  else\n"
 "#   ifdef USESHADOWSAMPLER\n"
 "#     ifdef USESHADOWMAPPCF\n"
-"#       define texval(x, y) dp_shadow2D(Texture_ShadowMap2D, vec3(center + vec2(x, y)*ShadowMap_TextureScale, shadowmaptc.z))  \n"
-"      vec2 center = shadowmaptc.xy*ShadowMap_TextureScale;\n"
-"      f = dot(vec4(0.25), vec4(texval(-0.4, 1.0), texval(-1.0, -0.4), texval(0.4, -1.0), texval(1.0, 0.4)));\n"
+"#       define texval(off) dp_shadow2D(Texture_ShadowMap2D, vec3((center + off)*ShadowMap_TextureScale, shadowmaptc.z))  \n"
+"      vec2 offset = fract(shadowmaptc.xy - 0.5), center = shadowmaptc.xy - offset;\n"
+"      vec4 size = vec4(offset + 1.0, 2.0 - offset), weight = vec4(2.0 - 1.0 / size.xy, 1.0 / size.zw - 1.0);\n"
+"      f = (1.0/9.0)*dot(size.zxzx*size.wwyy, vec4(texval(weight.zw), texval(weight.xw), texval(weight.zy), texval(weight.xy)));\n"
+"//#       define texval(x, y) dp_shadow2D(Texture_ShadowMap2D, vec3(center + vec2(x, y)*ShadowMap_TextureScale, shadowmaptc.z))  \n"
+"//    vec2 center = shadowmaptc.xy*ShadowMap_TextureScale;\n"
+"//    f = dot(vec4(0.25), vec4(texval(-0.4, 1.0), texval(-1.0, -0.4), texval(0.4, -1.0), texval(1.0, 0.4)));\n"
 "#     else\n"
 "      f = dp_shadow2D(Texture_ShadowMap2D, vec3(shadowmaptc.xy*ShadowMap_TextureScale, shadowmaptc.z));\n"
 "#     endif\n"