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#define SMF_TEXSQR_SIZE 1024.0
#define SMF_DETAILTEX_RES 0.02
// uniform vec2 mapSizePO2; // pwr2map{x,z} * SQUARE_SIZE (TODO programmatically #define this)
// uniform vec2 mapSize; // map{x,z} * SQUARE_SIZE (TODO programmatically #define this)
// uniform vec2 mapHeights; // readmap->curr{Min, Max}Height
uniform vec2 normalTexGen; // either 1.0/mapSize (when NPOT are supported) or 1.0/mapSizePO2
uniform vec2 specularTexGen; // 1.0/mapSize
uniform ivec2 texSquare;
uniform vec4 splatTexScales; // defaults to SMF_DETAILTEX_RES per channel
uniform vec3 cameraPos;
uniform vec4 lightDir; // mapInfo->light.sunDir
varying vec3 halfDir;
varying float fogFactor;
varying vec4 vertexWorldPos;
varying vec2 diffuseTexCoords;
varying vec2 specularTexCoords;
varying vec2 normalTexCoords;
void main() {
// calc some lighting variables
vec3 viewDir = vec3(gl_ModelViewMatrixInverse * vec4(0.0, 0.0, 0.0, 1.0));
viewDir = normalize(viewDir - gl_Vertex.xyz);
halfDir = normalize(lightDir.xyz + viewDir);
vertexWorldPos = gl_Vertex;
// calc texcoords
diffuseTexCoords = (floor(gl_Vertex.xz) / SMF_TEXSQR_SIZE) - vec2(texSquare);
specularTexCoords = gl_Vertex.xz * specularTexGen;
normalTexCoords = gl_Vertex.xz * normalTexGen;
// detail-tex coords
#if (SMF_DETAIL_TEXTURE_SPLATTING == 0)
gl_TexCoord[0].st = gl_Vertex.xz * vec2(SMF_DETAILTEX_RES);
#else
gl_TexCoord[0].st = gl_Vertex.xz * vec2(splatTexScales.r);
gl_TexCoord[0].pq = gl_Vertex.xz * vec2(splatTexScales.g);
gl_TexCoord[1].st = gl_Vertex.xz * vec2(splatTexScales.b);
gl_TexCoord[1].pq = gl_Vertex.xz * vec2(splatTexScales.a);
#endif
// transform vertex pos
gl_Position = gl_ModelViewMatrix * gl_Vertex;
float fogCoord = length(gl_Position.xyz);
gl_Position = gl_ProjectionMatrix * gl_Position;
// emulate linear fog
fogFactor = (gl_Fog.end - fogCoord) * gl_Fog.scale; // gl_Fog.scale == 1.0 / (gl_Fog.end - gl_Fog.start)
fogFactor = clamp(fogFactor, 0.0, 1.0);
}
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