From 82d1c94d999654bda5d40108393eade80b77342c Mon Sep 17 00:00:00 2001
From: LLLL Colonq <llll@colonq>
Date: Wed, 15 Jan 2025 21:21:22 -0500
Subject: Update

---
 src/assets/shaders/bitmap/frag.glsl | 59 +++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/assets/shaders/bitmap/frag.glsl

(limited to 'src/assets/shaders/bitmap/frag.glsl')

diff --git a/src/assets/shaders/bitmap/frag.glsl b/src/assets/shaders/bitmap/frag.glsl
new file mode 100644
index 0000000..94d27c9
--- /dev/null
+++ b/src/assets/shaders/bitmap/frag.glsl
@@ -0,0 +1,59 @@
+#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;
+uniform vec3 text_color;
+
+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;
+    texel.r = text_color.r;
+    texel.g = text_color.g;
+    texel.b = text_color.b;
+    frag_color = texel;
+} 
-- 
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