5899a26aad
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14590 178a84e3-b1eb-0310-8ba1-8eac791a3b58
53 lines
1.2 KiB
GLSL
53 lines
1.2 KiB
GLSL
#version 120
|
|
|
|
uniform sampler2D tex;
|
|
uniform vec2 texsize;
|
|
uniform int notex;
|
|
|
|
float miplevel(in vec2 texture_coordinate)
|
|
{
|
|
// The OpenGL Graphics System: A Specification 4.2
|
|
// - chapter 3.9.11, equation 3.21
|
|
|
|
vec2 dx_vtc = dFdx(texture_coordinate);
|
|
vec2 dy_vtc = dFdy(texture_coordinate);
|
|
float delta_max_sqr = max(dot(dx_vtc, dx_vtc), dot(dy_vtc, dy_vtc));
|
|
|
|
return 0.5 * log2(delta_max_sqr); // == log2(sqrt(delta_max_sqr));
|
|
}
|
|
|
|
void main() {
|
|
|
|
if (notex != 0) {
|
|
gl_FragColor = gl_Color;
|
|
return;
|
|
}
|
|
|
|
// Buggy Intel windows driver workaround
|
|
vec4 levels[6] = vec4[](
|
|
vec4(0.0, 0.0, 1.0, 0.8),
|
|
vec4(0.0, 0.5, 1.0, 0.4),
|
|
vec4(1.0, 1.0, 1.0, 0.0),
|
|
vec4(1.0, 0.7, 0.0, 0.2),
|
|
vec4(1.0, 0.3, 0.0, 0.6),
|
|
vec4(1.0, 0.0, 0.0, 0.8)
|
|
);
|
|
|
|
float mip = miplevel(texsize * gl_TexCoord[0].xy) + 2.0;
|
|
mip = clamp(mip, 0.0, 5.0);
|
|
|
|
int lowmip = int(mip);
|
|
int highmip = lowmip + 1;
|
|
if (highmip > 5)
|
|
highmip = 5;
|
|
|
|
float mixer = fract(mip);
|
|
|
|
vec4 mixcol = mix(levels[lowmip], levels[highmip], mixer);
|
|
vec4 tcol = texture2D(tex, gl_TexCoord[0].xy);
|
|
|
|
vec3 col = mix(tcol.xyz, mixcol.xyz, mixcol.a);
|
|
|
|
gl_FragColor = vec4(col, tcol.a);
|
|
}
|