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uniform vec2 mapSizePO2; // (1.0 / pwr2map{x,z} * SQUARE_SIZE)
uniform vec2 mapSize; // (1.0 / map{x,z} * SQUARE_SIZE)
uniform vec2 texOffset;
uniform vec3 billboardDirX;
uniform vec3 billboardDirY;
uniform vec3 billboardDirZ;
uniform mat4 shadowMatrix;
uniform vec4 shadowParams;
uniform float simFrame;
uniform vec3 windSpeed;
void main() {
#ifdef GRASS_DIST_BASIC
vec4 vertexPos = gl_Vertex;
#ifdef GRASS_ANIMATION
float windScale =
0.005 * (1.0 + sin((vertexPos.x + vertexPos.z) / 45.0 + simFrame / 15.0)) *
gl_Normal.y * (1.0 - texOffset.x);
vertexPos.xz += (windSpeed.xz * windScale);
#endif
vertexPos.xyz += billboardDirX * gl_Normal.x;
vertexPos.xyz += billboardDirY * gl_Normal.y;
vertexPos.xyz += billboardDirZ;
gl_TexCoord[0].st = gl_MultiTexCoord0.st + texOffset;
gl_TexCoord[1].st = vertexPos.xz * mapSize;
gl_TexCoord[2].st = vertexPos.xz * mapSize;
gl_TexCoord[3].st = vertexPos.xz * mapSizePO2;
vertexPos = gl_ModelViewMatrix * vertexPos;
gl_FrontColor = gl_Color;
gl_FogFragCoord = length(vertexPos.xyz);
gl_Position = gl_ProjectionMatrix * vertexPos;
#endif
#ifdef GRASS_NEAR_SHADOW
vec2 p17 = vec2(shadowParams.z, shadowParams.z);
vec2 p18 = vec2(shadowParams.w, shadowParams.w);
vec4 vertexPos = gl_ModelViewMatrix * gl_Vertex;
#ifdef GRASS_ANIMATION
vec2 windScale = vec2(
sin((simFrame + gl_MultiTexCoord0.s) * 5.0 / (10.0 + floor(gl_MultiTexCoord0.s))) * (gl_MultiTexCoord0.t) * 0.01,
(1.0 + sin((vertexPos.x + vertexPos.z) / 45.0 + simFrame / 15.0)) * 0.025 * gl_MultiTexCoord0.t
);
vertexPos.x += dot(windSpeed.zx, windScale);
vertexPos.z += dot(windSpeed.xz, windScale);
#endif
vec4 vertexShadowPos = shadowMatrix * vertexPos;
vertexShadowPos.st *= (inversesqrt(abs(vertexShadowPos.st) + p17) + p18);
vertexShadowPos.st += shadowParams.xy;
gl_TexCoord[0].st = vertexPos.xz * mapSizePO2;
gl_TexCoord[1] = vertexShadowPos;
gl_TexCoord[1].z = dot(shadowMatrix[2], vertexPos);
gl_TexCoord[1].w = dot(shadowMatrix[3], vertexPos);
gl_TexCoord[2].st = vertexPos.xz * mapSize;
gl_TexCoord[3].st = gl_MultiTexCoord0.st;
gl_FrontColor = gl_Color;
gl_FogFragCoord = length(vertexPos.xyz);
gl_Position = gl_ProjectionMatrix * vertexPos;
#endif
#ifdef GRASS_DIST_SHADOW
vec2 p17 = vec2(shadowParams.z, shadowParams.z);
vec2 p18 = vec2(shadowParams.w, shadowParams.w);
vec4 vertexPos = gl_Vertex;
#ifdef GRASS_ANIMATION
float windScale =
0.005 * (1.0 + sin((vertexPos.x + vertexPos.z) / 45.0 + simFrame / 15.0)) *
gl_Normal.y * (1.0 - texOffset.x);
vertexPos.xz += (windSpeed.xz * windScale);
#endif
vertexPos.xyz += billboardDirX * gl_Normal.x;
vertexPos.xyz += billboardDirY * gl_Normal.y;
vertexPos.xyz += billboardDirZ;
vec4 vertexShadowPos = shadowMatrix * vertexPos;
vertexShadowPos.st *= (inversesqrt(abs(vertexShadowPos.st) + p17) + p18);
vertexShadowPos.st += shadowParams.xy;
// prevent grass from being shadowed by the ground beneath it
gl_TexCoord[0].st = vertexPos.xz * mapSizePO2;
gl_TexCoord[1] = vertexShadowPos;
gl_TexCoord[1].z = dot(shadowMatrix[2], vertexPos) - 0.0005;
gl_TexCoord[1].w = dot(shadowMatrix[3], vertexPos);
gl_TexCoord[2].st = vertexPos.xz * mapSize;
gl_TexCoord[3].st = gl_MultiTexCoord0.st + texOffset;
vertexPos = gl_ModelViewMatrix * vertexPos;
gl_FrontColor = gl_Color;
gl_FogFragCoord = length(vertexPos.xyz);
gl_Position = gl_ProjectionMatrix * vertexPos;
#endif
}
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