28 lines
584 B
GLSL
28 lines
584 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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attribute vec2 a_position;
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uniform vec4 u_viewbox; // [x, y, width, height]
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uniform vec2 u_resolution;
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uniform mat3 u_trans;
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varying vec2 v_pos;
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void main() {
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vec3 pos = vec3(a_position, 1.0);
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pos = u_trans * pos;
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vec2 uv = pos.xy;
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// Viewbox's center is top left, a_position's is in the center to the screen
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// So translate and scale the viewbox**
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uv -= u_viewbox.xy + (u_viewbox.zw * 0.5);
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uv /= u_viewbox.zw * 0.5;
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v_pos = (uv.xy + 1.0) * 0.5;
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gl_Position = vec4(uv.xy, 0.0, 1.0);
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}
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