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#if (GL_FRAGMENT_PRECISION_HIGH == 1)
// ancient GL3 ATI drivers confuse GLSL for GLSL-ES and require this
precision highp float;
#else
precision mediump float;
#endif
uniform sampler2D alphaMaskTex;
uniform vec4 shadowParams;
uniform vec2 alphaParams;
varying mat4 shadowViewMat;
varying mat4 shadowProjMat;
varying vec4 vertexModelPos;
#if (SUPPORT_DEPTH_LAYOUT == 1)
// preserve early-z performance if possible
layout(depth_unchanged) out float gl_FragDepth;
#endif
void main() {
#if 0
// TODO: bind this (as for models)
if (texture2D(alphaMaskTex, gl_TexCoord[0].st).a <= alphaParams.x)
discard;
#endif
#if (SHADOWGEN_PER_FRAGMENT == 1)
// note: voids glPolygonOffset calls
vec4 vertexShadowPos = shadowViewMat * vertexModelPos;
vertexShadowPos.xy *= (inversesqrt(abs(vertexShadowPos.xy) + shadowParams.zz) + shadowParams.ww);
vertexShadowPos.xy += shadowParams.xy;
vertexShadowPos.z += 0.00250;
vec4 vertexShadowClipPos = shadowProjMat * vertexShadowPos;
float nearDepth = gl_DepthRange.near;
float farDepth = gl_DepthRange.far;
float depthRange = gl_DepthRange.diff; // far - near
float clipDepth = vertexShadowClipPos.z / vertexShadowClipPos.w;
#if (SUPPORT_CLIP_CONTROL == 1)
// ZTO; shadow PM is pre-adjusted
gl_FragDepth = (depthRange * clipDepth) + nearDepth;
#else
// NOTO; useful to keep around
gl_FragDepth = ((depthRange * clipDepth) + nearDepth + farDepth) * 0.5;
#endif
#else
// no-op
gl_FragDepth = gl_FragCoord.z;
#endif
}
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