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#version 120
uniform mat4 projection;
uniform vec2 position;
uniform vec2 anchor;
uniform vec2 scale;
uniform float rotation;
void main(void) {
mat4 rotationMatrix = mat4(cos(rotation), -sin(rotation), 0.0, 0.0,
sin(rotation), cos(rotation), 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
mat4 translationMatrix = mat4(1.0, 0.0, 0.0, position.x - anchor.x,
0.0, 1.0, 0.0, position.y - anchor.y,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
mat4 scaleMatrix = mat4(scale.x, 0.0, 0.0, 0.0,
0.0, scale.y, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
gl_Position = projection * (gl_Vertex * scaleMatrix *
rotationMatrix * translationMatrix);
gl_TexCoord[0] = gl_MultiTexCoord0;
}
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