| #version 150 core |
| |
| in vec4 vCoord; |
| in vec2 tCoord; |
| |
| out vec2 sampleCoord; |
| out vec3 sampleFarLeft; |
| out vec3 sampleNearLeft; |
| out vec3 sampleNearRight; |
| out vec3 sampleFarRight; |
| |
| uniform mat4 matrix; |
| uniform vec2 textureScale; |
| uniform float fontScale; |
| uniform vec4 vecDelta; |
| |
| void main() |
| { |
| sampleCoord = tCoord * textureScale; |
| gl_Position = matrix * vCoord; |
| |
| // Calculate neighbor pixel position in item space. |
| vec3 wDelta = gl_Position.w * vecDelta.xyw; |
| vec3 farLeft = vCoord.xyw - 0.667 * wDelta; |
| vec3 nearLeft = vCoord.xyw - 0.333 * wDelta; |
| vec3 nearRight = vCoord.xyw + 0.333 * wDelta; |
| vec3 farRight = vCoord.xyw + 0.667 * wDelta; |
| |
| // Calculate neighbor texture coordinate. |
| vec2 scale = textureScale / fontScale; |
| vec2 base = sampleCoord - scale * vCoord.xy; |
| sampleFarLeft = vec3(base * farLeft.z + scale * farLeft.xy, farLeft.z); |
| sampleNearLeft = vec3(base * nearLeft.z + scale * nearLeft.xy, nearLeft.z); |
| sampleNearRight = vec3(base * nearRight.z + scale * nearRight.xy, nearRight.z); |
| sampleFarRight = vec3(base * farRight.z + scale * farRight.xy, farRight.z); |
| } |