gzdoom-gles/wadsrc/static/shaders/glsl/screenquadscale.vp

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layout (location = 0) in vec4 PositionInProjection;
layout (location = 1) in vec2 UV;
out vec2 TexCoord;
void main()
{
gl_Position = PositionInProjection;
TexCoord = UV * UVScale;
}