shaders/tile-shader.vert


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precision highp float;

layout (location = 0) uniform vec2 scale;
layout (location = 1) uniform vec2 offset;

layout (location = 0) in vec4 position;
layout (location = 1) in vec2 texcoords;
noperspective out vec2 frag_texcoords;

void main() {
    frag_texcoords = texcoords;

    float cx = 2/scale.x, cy = 2/(scale.y*4./3.);
    float x = -position.y, y = -position.x, z = position.z;
    gl_Position = vec4((x-y+offset.x)*cx, (x+y+z*2)*cy*0.75-offset.y*cy, 0, 1);
}