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#include "common.glsl"
// Position the origin to the upper left
layout(origin_upper_left) in vec4 gl_FragCoord;
// Must declare this output for some versions of OpenGL.
layout(location = 0) out vec4 out_FragColor;
layout(binding = 1, std430) readonly buffer bg_cells {
uint cells[];
};
vec4 cell_bg() {
uvec2 grid_size = unpack2u16(grid_size_packed_2u16);
ivec2 grid_pos = ivec2(floor((gl_FragCoord.xy - grid_padding.wx) / cell_size));
bool use_linear_blending = (bools & USE_LINEAR_BLENDING) != 0;
vec4 bg = vec4(0.0);
// Clamp x position, extends edge bg colors in to padding on sides.
if (grid_pos.x < 0) {
if ((padding_extend & EXTEND_LEFT) != 0) {
grid_pos.x = 0;
} else {
return bg;
}
} else if (grid_pos.x > grid_size.x - 1) {
if ((padding_extend & EXTEND_RIGHT) != 0) {
grid_pos.x = int(grid_size.x) - 1;
} else {
return bg;
}
}
// Clamp y position if we should extend, otherwise discard if out of bounds.
if (grid_pos.y < 0) {
if ((padding_extend & EXTEND_UP) != 0) {
grid_pos.y = 0;
} else {
return bg;
}
} else if (grid_pos.y > grid_size.y - 1) {
if ((padding_extend & EXTEND_DOWN) != 0) {
grid_pos.y = int(grid_size.y) - 1;
} else {
return bg;
}
}
// Load the color for the cell.
vec4 cell_color = load_color(
unpack4u8(cells[grid_pos.y * grid_size.x + grid_pos.x]),
use_linear_blending
);
return cell_color;
}
void main() {
out_FragColor = cell_bg();
}
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