#version 330 core

#define FONT_WIDTH 128
#define FONT_HEIGHT 64
#define FONT_COLS 18
#define FONT_ROWS 7
#define FONT_CH_W (FONT_WIDTH / FONT_COLS)
#define FONT_CH_H (FONT_HEIGHT / FONT_ROWS)

uniform vec2 resolution;
uniform float time;
uniform vec2 camera;

layout(location = 0) in vec2 pos;
layout(location = 1) in vec2 size;
layout(location = 2) in vec2 uv_pos;
layout(location = 3) in vec2 uv_size;
layout(location = 4) in vec4 fg_color;
layout(location = 5) in vec4 bg_color;

out vec2 uv;
out vec2 glyph_uv_pos;
out vec2 glyph_uv_size;
out vec4 glyph_fg_color;
out vec4 glyph_bg_color;

vec2 project_point(vec2 point)
{
  return (2.0 * (point - camera)) / resolution;
}

void main()
{
	uv = vec2(float(gl_VertexID & 1),
		  float((gl_VertexID >> 1) & 1));

	gl_Position = vec4(project_point(uv * size + pos), 0.0, 1.0);

	glyph_uv_pos = uv_pos;
	glyph_uv_size = uv_size;
	glyph_fg_color = fg_color;
	glyph_bg_color = bg_color;
}