mirror of
https://github.com/lihop/godot-xterm.git
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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>
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// SPDX-License-Identifier: MIT
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#define FLAG_INVERSE 1 << 0
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#define FLAG_BLINK 1 << 1
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#define FLAG_CURSOR 1 << 2
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#define transparent vec4(0)
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uniform int cols;
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uniform int rows;
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uniform vec2 size;
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uniform vec2 cell_size;
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uniform vec2 grid_size;
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uniform sampler2D attributes;
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uniform bool inverse_enabled = true;
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uniform bool has_focus = false;
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#ifdef BACKGROUND
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uniform vec4 background_color;
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uniform sampler2D background_colors;
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uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
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#endif
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#ifdef FOREGROUND
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uniform float blink_off_time = 0.3;
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uniform float blink_on_time = 0.6;
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#endif
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bool has_attribute(vec2 uv, int flag) {
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int flags = int(texture(attributes, uv).r * 255.0 + 0.5);
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return (flags & flag) != 0;
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}
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void fragment() {
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// Check if we are inside the grid.
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if (UV.x * size.x < grid_size.x && UV.y * size.y < grid_size.y) {
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vec2 grid_uv = UV * size / cell_size;
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int cell_x = int(grid_uv.x);
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int cell_y = int(grid_uv.y);
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vec2 sample_uv = (vec2(float(cell_x), float(cell_y)) + 0.5) / vec2(float(cols), float(rows));
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vec4 color;
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#ifdef BACKGROUND
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color = texture(background_colors, sample_uv);
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#elif defined(FOREGROUND)
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color = texture(TEXTURE, UV);
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#endif
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bool unfocused_cursor = !has_focus && has_attribute(sample_uv, FLAG_CURSOR);
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#ifdef BACKGROUND
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if (has_attribute(sample_uv, FLAG_INVERSE) && inverse_enabled) {
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vec4 bg_color = textureLod(screen_texture, SCREEN_UV, 0.0);
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vec4 target_color;
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target_color.a = color.a + (1.0 - color.a) * bg_color.a;
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target_color.rgb = 1.0 / target_color.a * (color.a * color.rgb + (1.0 - color.a) * bg_color.a * bg_color.rgb);
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color = vec4(1.0 - target_color.rgb, target_color.a);
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}
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#else
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if (has_attribute(sample_uv, FLAG_INVERSE) && inverse_enabled && !unfocused_cursor) {
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color.rgb = vec3(1.0 - color.rgb);
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}
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#endif
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#ifdef FOREGROUND
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if (has_attribute(sample_uv, FLAG_BLINK)) {
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float blink_cycle = blink_on_time + blink_off_time;
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float current_time = mod(TIME, blink_cycle);
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if (current_time > blink_on_time) {
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color = transparent;
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}
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}
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#endif
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#ifdef BACKGROUND
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if (unfocused_cursor) {
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// Draw hollow cursor when not focused.
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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;
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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;
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if (!isBorderX && !isBorderY) {
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color = transparent;
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}
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}
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#endif
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COLOR = color;
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} else { // Outside the grid.
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COLOR = transparent;
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}
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} |