mirror of
https://github.com/lihop/godot-xterm.git
synced 2024-11-22 17:50:25 +01:00
94 lines
No EOL
2.6 KiB
Text
94 lines
No EOL
2.6 KiB
Text
// SPDX-FileCopyrightText: 2024 Leroy Hopson <godot-xterm@leroy.nix.nz>
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
#define FLAG_INVERSE 1 << 0
|
|
#define FLAG_BLINK 1 << 1
|
|
#define FLAG_CURSOR 1 << 2
|
|
|
|
#define transparent vec4(0)
|
|
|
|
uniform int cols;
|
|
uniform int rows;
|
|
uniform vec2 size;
|
|
uniform vec2 cell_size;
|
|
uniform vec2 grid_size;
|
|
|
|
uniform sampler2D attributes;
|
|
uniform bool inverse_enabled = true;
|
|
uniform bool has_focus = false;
|
|
|
|
#ifdef BACKGROUND
|
|
uniform vec4 background_color;
|
|
uniform sampler2D background_colors;
|
|
uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
|
|
#endif
|
|
|
|
#ifdef FOREGROUND
|
|
uniform float blink_off_time = 0.3;
|
|
uniform float blink_on_time = 0.6;
|
|
#endif
|
|
|
|
bool has_attribute(vec2 uv, int flag) {
|
|
int flags = int(texture(attributes, uv).r * 255.0 + 0.5);
|
|
return (flags & flag) != 0;
|
|
}
|
|
|
|
void fragment() {
|
|
// Check if we are inside the grid.
|
|
if (UV.x * size.x < grid_size.x && UV.y * size.y < grid_size.y) {
|
|
vec2 grid_uv = UV * size / cell_size;
|
|
|
|
int cell_x = int(grid_uv.x);
|
|
int cell_y = int(grid_uv.y);
|
|
|
|
vec2 sample_uv = (vec2(float(cell_x), float(cell_y)) + 0.5) / vec2(float(cols), float(rows));
|
|
|
|
vec4 color;
|
|
#ifdef BACKGROUND
|
|
color = texture(background_colors, sample_uv);
|
|
#elif defined(FOREGROUND)
|
|
color = texture(TEXTURE, UV);
|
|
#endif
|
|
|
|
bool unfocused_cursor = !has_focus && has_attribute(sample_uv, FLAG_CURSOR);
|
|
|
|
#ifdef BACKGROUND
|
|
if (has_attribute(sample_uv, FLAG_INVERSE) && inverse_enabled) {
|
|
vec4 bg_color = textureLod(screen_texture, SCREEN_UV, 0.0);
|
|
vec4 target_color;
|
|
target_color.a = color.a + (1.0 - color.a) * bg_color.a;
|
|
target_color.rgb = 1.0 / target_color.a * (color.a * color.rgb + (1.0 - color.a) * bg_color.a * bg_color.rgb);
|
|
color = vec4(1.0 - target_color.rgb, target_color.a);
|
|
}
|
|
#else
|
|
if (has_attribute(sample_uv, FLAG_INVERSE) && inverse_enabled && !unfocused_cursor) {
|
|
color.rgb = vec3(1.0 - color.rgb);
|
|
}
|
|
#endif
|
|
|
|
#ifdef FOREGROUND
|
|
if (has_attribute(sample_uv, FLAG_BLINK)) {
|
|
float blink_cycle = blink_on_time + blink_off_time;
|
|
float current_time = mod(TIME, blink_cycle);
|
|
if (current_time > blink_on_time) {
|
|
color = transparent;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef BACKGROUND
|
|
if (unfocused_cursor) {
|
|
// Draw hollow cursor when not focused.
|
|
bool isBorderX = (UV.x * size.x - float(cell_x) * cell_size.x) < 1.0 || (float(cell_x + 1) * cell_size.x - UV.x * size.x) < 1.0;
|
|
bool isBorderY = (UV.y * size.y - float(cell_y) * cell_size.y) < 1.0 || (float(cell_y + 1) * cell_size.y - UV.y * size.y) < 1.0;
|
|
if (!isBorderX && !isBorderY) {
|
|
color = transparent;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
COLOR = color;
|
|
} else { // Outside the grid.
|
|
COLOR = transparent;
|
|
}
|
|
} |