gtk2/gsk/resources/glsl/blit.vs.glsl
Emmanuele Bassi 1ab1fd4391 Use the projection to flip around the content
Since we use an FBO to render the contents of the render node tree, the
coordinate space is going to be flipped in GL. We can undo the flip by
using an appropriate projection matrix, instead of changing the sampling
coordinates in the shaders and updating all our coordinates at render
time.
2016-10-18 11:49:10 +01:00

7 lines
118 B
GLSL

void main() {
gl_Position = uMVP * vec4(aPosition, 0.0, 1.0);
// Flip the sampling
vUv = vec2(aUv.x, aUv.y);
}