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in vec2 pos;
in vec2 uvs;
/* initial uv coordinate */
out vec2 uvcoord;
/* coordinate used for calculating radius et al set in geometry shader */
out vec2 particlecoord;
/* downsampling coordinates */
out vec2 downsample1;
out vec2 downsample2;
out vec2 downsample3;
out vec2 downsample4;
uniform vec2 invrendertargetdim;
uniform ivec2 rendertargetdim;
void vert_dof_downsample()
{
/* gather pixels from neighbors. half dimensions means we offset half a pixel to
* get this right though it's possible we may lose a pixel at some point */
downsample1 = uvs.xy + vec2(-0.5, -0.5) * invrendertargetdim;
downsample2 = uvs.xy + vec2(-0.5, 0.5) * invrendertargetdim;
downsample3 = uvs.xy + vec2(0.5, 0.5) * invrendertargetdim;
downsample4 = uvs.xy + vec2(0.5, -0.5) * invrendertargetdim;
gl_Position = vec4(pos, 0.0, 1.0);
}
/* geometry shading pass, calculate a texture coordinate based on the indexed id */
void vert_dof_coc_scatter_pass()
{
vec2 pixel = vec2(rendertargetdim.x, rendertargetdim.y);
/* some math to get the target pixel */
int row = gl_InstanceID / rendertargetdim.x;
int column = gl_InstanceID % rendertargetdim.x;
uvcoord = (vec2(column, row) + vec2(0.5)) / pixel;
vec2 pos = uvcoord * 2.0 - vec2(1.0);
gl_Position = vec4(pos.x, pos.y, 0.0, 1.0);
// uvcoord = vec2(0.5, 0.5);
// gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
}
void vert_dof_final()
{
uvcoord = uvs;
gl_Position = vec4(pos, 0.0, 1.0);
}
void main()
{
#if defined(FIRST_PASS)
vert_dof_downsample();
#elif defined(SECOND_PASS)
vert_dof_coc_scatter_pass();
#else
vert_dof_final();
#endif
}
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