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#version 300 es
precision highp float;
uniform sampler2D texture_data;
uniform int text_length;
uniform int text[256];
uniform int char_width;
uniform int char_height;
uniform int font_width;
uniform int font_height;
uniform int text_width;
uniform int text_height;
in vec2 vertex_texcoord;
out vec4 frag_color;
void main()
{
vec2 inverted_texcoord = vec2(vertex_texcoord.x, 1.0 - vertex_texcoord.y);
vec2 texcoord_pixels = inverted_texcoord * vec2(float(text_width), float(text_height));
int texcoord_char_x = int(floor(texcoord_pixels.x)) / char_width;
int texcoord_char_y = int(floor(texcoord_pixels.y)) / char_height;
int x = 0;
int y = 0;
int i = 0;
for (; i < text_length; ++i) {
if (x == texcoord_char_x && y == texcoord_char_y) {
break;
}
if (text[i] == 10) {
x = 0;
y += 1;
} else {
x += 1;
}
}
if (i == text_length || text[i] == 10) discard;
int entry = text[i] - 32;
vec2 texcoord_base = vec2(
float(entry % (font_width / char_width)) * float(char_width),
float(entry / (font_width / char_width)) * float(char_height)
);
// vec2 texcoord_base = vec2(8.0, 0.0);
vec2 texcoord_off = vec2(
mod(texcoord_pixels.x, float(char_width)),
mod(texcoord_pixels.y, float(char_height))
);
vec2 texcoord_final = (texcoord_base + texcoord_off) / vec2(float(font_width), float(font_height));
vec4 texel = texture(texture_data, texcoord_final);
if (texel.rgb == vec3(0.0, 0.0, 0.0)) discard;
frag_color = texel;
}
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