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implement vertex coordinate mapping in text.v.glsl

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This commit is contained in:
Josh Holtrop 2014-06-23 15:05:28 -04:00
parent 21aa8543ac
commit 8aff635d5f
1 changed files with 8 additions and 1 deletions
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9
runtime/shaders/text.v.glsl
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@ -1,9 +1,16 @@
uniform vec2 screen_size;
uniform vec2 position;
attribute vec4 coords; attribute vec4 coords;
varying vec2 texture_coord_v; varying vec2 texture_coord_v;
void main(void) void main(void)
{ {
gl_Position = vec4(coords.xy, 0, 1); // Map coordinates such that:
// (-0.5 .. screen_size.x-0.5) => (-1.0 .. 1.0)
gl_Position = vec4(2.0 * (position.x + coords.x + 0.5) / screen_size.x - 1.0,
2.0 * (position.y + coords.y + 0.5) / screen_size.y - 1.0,
0, 1);
texture_coord_v = coords.zw; texture_coord_v = coords.zw;
} }