27 lines
519 B
GLSL
27 lines
519 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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attribute vec2 a_pos;
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uniform vec4 u_viewbox; // [x, y, width, height]
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uniform vec2 u_resolution;
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varying vec2 v_pos;
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void main() {
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vec2 uv = (a_pos.xy + 1.0) * 0.5;
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uv = 1.0 - uv;
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// uv *= -1.0;
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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.zw;
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uv -= u_viewbox.xy + u_viewbox.zw;
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v_pos = uv.xy;
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gl_Position = vec4(a_pos, 0.0, 1.0);
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}
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