mirror of
https://github.com/ghostty-org/ghostty.git
synced 2025-07-16 08:46:08 +03:00
74 lines
2.5 KiB
GLSL
74 lines
2.5 KiB
GLSL
#version 330 core
|
|
|
|
// The grid coordinates (x, y) where x < columns and y < rows
|
|
layout (location = 0) in vec2 grid_coord;
|
|
|
|
// Position of the glyph in the texture.
|
|
layout (location = 1) in vec2 glyph_pos;
|
|
|
|
// Width/height of the glyph
|
|
layout (location = 2) in vec2 glyph_size;
|
|
|
|
// Offset of the top-left corner of the glyph when rendered in a rect.
|
|
layout (location = 3) in vec2 glyph_offset;
|
|
|
|
// The background color for this cell in RGBA (0 to 1.0)
|
|
layout (location = 4) in vec4 bg_color_in;
|
|
|
|
// The background color for this cell in RGBA (0 to 1.0)
|
|
flat out vec4 bg_color;
|
|
|
|
// The x/y coordinate for the glyph representing the font.
|
|
out vec2 glyph_tex_coords;
|
|
|
|
uniform sampler2D text;
|
|
uniform vec2 cell_size;
|
|
uniform mat4 projection;
|
|
|
|
void main() {
|
|
// Top-left cell coordinates converted to world space
|
|
// Example: (1,0) with a 30 wide cell is converted to (30,0)
|
|
vec2 cell_pos = cell_size * grid_coord;
|
|
|
|
// Turn the cell position into a vertex point depending on the
|
|
// gl_VertexID. Since we use instanced drawing, we have 4 vertices
|
|
// for each corner of the cell. We can use gl_VertexID to determine
|
|
// which one we're looking at. Using this, we can use 1 or 0 to keep
|
|
// or discard the value for the vertex.
|
|
//
|
|
// 0 = top-right
|
|
// 1 = bot-right
|
|
// 2 = bot-left
|
|
// 3 = top-left
|
|
vec2 position;
|
|
position.x = (gl_VertexID == 0 || gl_VertexID == 1) ? 1. : 0.;
|
|
position.y = (gl_VertexID == 0 || gl_VertexID == 3) ? 0. : 1.;
|
|
|
|
int background = 0;
|
|
if (background == 1) {
|
|
// Calculate the final position of our cell in world space.
|
|
// We have to add our cell size since our vertices are offset
|
|
// one cell up and to the left. (Do the math to verify yourself)
|
|
cell_pos = cell_pos + cell_size * position;
|
|
|
|
gl_Position = projection * vec4(cell_pos, 0.0, 1.0);
|
|
bg_color = vec4(bg_color_in.rgb / 255.0, 1.0);
|
|
} else {
|
|
// TODO: why?
|
|
vec2 glyph_offset_calc = glyph_offset;
|
|
glyph_offset_calc.y = cell_size.y - glyph_offset.y;
|
|
|
|
// Calculate the final position of the cell.
|
|
cell_pos = cell_pos + glyph_size * position + glyph_offset_calc;
|
|
gl_Position = projection * vec4(cell_pos, 0.0, 1.0);
|
|
|
|
// Calculate our texture coordinate
|
|
ivec2 text_size = textureSize(text, 0);
|
|
vec2 glyph_tex_size = glyph_size / text_size.xy;
|
|
glyph_tex_coords = glyph_pos + glyph_tex_size * position;
|
|
|
|
// This is used to color the font for now.
|
|
bg_color = vec4(bg_color_in.rgb / 255.0, 1.0);
|
|
}
|
|
}
|