Integrate stb_truetype

CMakeLists.txt

@@ -212,6 +212,7 @@ if (NOT BB_IS_CI)
     target_sources(${COMPILER_NAME} PRIVATE
         "bootstrap/bloat-buster/shader_compilation.c"
         "bootstrap/bloat-buster/image_loader.c"
+        "bootstrap/bloat-buster/font.c"
     )
 
     target_include_directories(${COMPILER_NAME} PRIVATE dependencies/stb)

bootstrap/bloat-buster/font.c

@@ -0,0 +1,65 @@
+#include <bloat-buster/font.h>
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include <stb_truetype.h>
+
+TextureAtlas font_create_texture_atlas(Arena* arena, String font_path)
+{
+    auto font_file = file_read(arena, font_path);
+    stbtt_fontinfo font_info;
+    if (!stbtt_InitFont(&font_info, font_file.pointer, 0))
+    {
+        failed_execution();
+    }
+
+    int atlas_width = 1024;
+    int atlas_height = 1024;
+    int atlas_size = atlas_width * atlas_height;
+
+    auto* atlas = arena_allocate(arena, u8, atlas_size);
+
+    int char_width = 64; // Width of each character’s cell in the atlas
+    int char_height = 64; // Height of each character’s cell in the atlas
+    int x = 0;
+    int y = 0; // Starting position in the atlas
+    float scale_x = 0.0f;
+    float scale_y = stbtt_ScaleForPixelHeight(&font_info, char_height);
+
+    for (u32 i = 0; i <= 256; ++i)
+    {
+        int width;
+        int height;
+        int x_offset;
+        int y_offset;
+
+        auto ch = (u8)i;
+        u8* bitmap = stbtt_GetCodepointBitmap(&font_info, scale_x, scale_y, ch, &width, &height, &x_offset, &y_offset);
+        if (bitmap)
+        {
+            for (int j = 0; j < height; ++j)
+            {
+                for (int i = 0; i < width; ++i)
+                {
+                    atlas[(y + j) * atlas_width + (x + i)] = bitmap[j * width + i];
+                }
+            }
+
+            stbtt_FreeBitmap(bitmap, nullptr);
+        }
+
+        x += char_width;
+
+        if (x + char_width > atlas_width)
+        {
+            x = 0;
+            y += char_height;
+        }
+    }
+
+    return (TextureAtlas) {
+        .pointer = atlas,
+        .width = atlas_width,
+        .height = atlas_height,
+        .char_height = char_height,
+    };
+}

bootstrap/bloat-buster/gui.c

@@ -8,6 +8,7 @@
 
 #include <bloat-buster/shader_compilation.h>
 #include <bloat-buster/image_loader.h>
+#include <bloat-buster/font.h>
 
 [[noreturn]] [[gnu::cold]] fn void wrong_vulkan_result(VkResult result, String call_string, String file, int line)
 {
@@ -909,8 +910,8 @@ void run_app(Arena* arena)
     VkPipeline graphics_pipeline;
     VkPipelineLayout graphics_pipeline_layout;
     {
-        VkShaderModule vertex_shader = vk_shader_module_create(arena, device, allocation_callbacks, strlit("bootstrap/shaders/triangle.vert"), SHADER_STAGE_VERTEX);
-        VkShaderModule fragment_shader = vk_shader_module_create(arena, device, allocation_callbacks, strlit("bootstrap/shaders/triangle.frag"), SHADER_STAGE_FRAGMENT);
+        VkShaderModule vertex_shader = vk_shader_module_create(arena, device, allocation_callbacks, strlit("bootstrap/shaders/quad.vert"), SHADER_STAGE_VERTEX);
+        VkShaderModule fragment_shader = vk_shader_module_create(arena, device, allocation_callbacks, strlit("bootstrap/shaders/quad_tex.frag"), SHADER_STAGE_FRAGMENT);
 
         VkPushConstantRange push_constant_ranges[] = {
             {
@@ -1196,6 +1197,8 @@ void run_app(Arena* arena)
         immediate_end(immediate);
     }
 
+    auto texture_atlas = font_create_texture_atlas(arena, strlit("/usr/share/fonts/TTF/FiraSans-Regular.ttf"));
+
     auto texture_path =
 #ifdef _WIN32
         strlit("C:/Users/david/Pictures/buster.jpg");

bootstrap/include/bloat-buster/font.h

@@ -0,0 +1,12 @@
+#include <std/base.h>
+#include <std/os.h>
+
+STRUCT(TextureAtlas)
+{
+    u8* pointer;
+    u32 width;
+    u32 height;
+    u32 char_height;
+};
+
+EXPORT TextureAtlas font_create_texture_atlas(Arena* arena, String font_path);