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#version 410 core
#define SMF_TEXSQR_SIZE 1024.0
#define SMF_DETAILTEX_RES 0.02
uniform ivec4 texSquare; // x, y, y * X + x (index into diffuseTex), mip
uniform vec3 cameraPos;
uniform vec4 lightDir; // mapInfo->light.sunDir
uniform vec3 fogParams; // .x := start, .y := end, .z := viewrange
uniform vec4 clipPlane; // world-space
uniform mat4 viewMat;
uniform mat4 viewMatInv;
uniform mat4 viewProjMat;
layout(location = 0) in vec3 vertexPosAttr;
out vec3 halfDir;
out vec4 vertexPos;
out vec2 diffuseTexCoords;
out float gl_ClipDistance[SMF_CLIP_PLANE_IDX + 1];
out float fogFactor;
void main() {
// vec4 viewDir = viewMatInv * vec4(0.0, 0.0, 0.0, 1.0);
vec4 viewDir = vec4(cameraPos, 1.0);
viewDir.xyz = normalize(viewDir.xyz - vertexPosAttr);
halfDir.xyz = normalize(lightDir.xyz + viewDir.xyz);
vertexPos = vec4(vertexPosAttr, 1.0);
diffuseTexCoords = (floor(vertexPos.xz) / SMF_TEXSQR_SIZE) - texSquare.xy;
gl_Position = viewProjMat * vertexPos;
gl_ClipDistance[SMF_CLIP_PLANE_IDX] = dot(clipPlane, vertexPos);
{
float eyeDepth = length((viewMat * vertexPos).xyz);
float fogRange = (fogParams.y - fogParams.x) * fogParams.z;
float fogDepth = (eyeDepth - fogParams.x * fogParams.z) / fogRange;
// float fogDepth = (fogParams.y * fogParams.z - eyeDepth) / fogRange;
fogFactor = 1.0 - clamp(fogDepth, 0.0, 1.0);
// fogFactor = clamp(fogDepth, 0.0, 1.0);
}
}
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