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attribute vec4 attr_worldpos;
attribute vec3 attr_screenoffset;
attribute vec2 attr_texcoords;
attribute vec3 attr_screenworldoffset;
attribute vec4 attr_t_pickcolor; // changed name for ATI, optional attribute
// cannot be first/0 index, ATI sets index
// alphabetically
varying vec2 textureLookup ;
varying vec3 normalizedViewCoordinate;
varying vec4 pickcolor ;
uniform vec2 screenSize;
uniform vec2 pixelSize;
uniform float aspectRatioAdjustment;
uniform float screenOriginVertexScale;
varying float fog;
uniform float fog_enabled; // actually bool
void main()
{
vec4 pos = gl_ModelViewProjectionMatrix * attr_worldpos;
pos /= pos.w;
pos.xy += attr_screenworldoffset.xy / (screenSize.xy * screenOriginVertexScale);
pos.xy += attr_screenoffset.xy * 2. / screenSize * vec2(aspectRatioAdjustment, 1.);
// rounding to nearest pixel
pos.xy = (pixelSize * floor((pos.xy + 1.) / pixelSize)) - 1.;
vec3 viewVector = vec3(gl_ModelViewMatrixTranspose * vec4(0.,0., -1.,0.));
vec4 a_center = (attr_worldpos + attr_screenworldoffset.z * vec4(viewVector, 0.));
vec4 transformedPositionZ = gl_ModelViewProjectionMatrix * a_center;
pos.z = transformedPositionZ.z / transformedPositionZ.w;
gl_Position = pos;
textureLookup = attr_texcoords;
normalizedViewCoordinate = pos.xyz / 2.0 + 0.5;
if (fog_enabled > 0.5) {
vec3 eye_pos = vec3(gl_ModelViewMatrix * attr_worldpos);
fog = max(0.0, (gl_Fog.end - abs(eye_pos.z)) * gl_Fog.scale);
} else {
fog = 1.1; // >= 1.0
}
pickcolor = attr_t_pickcolor;
}
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