Finish text render test

build.zig

@@ -6,7 +6,7 @@ pub fn build(b: *Builder) void {
     
     exe.setBuildMode(mode);
     exe.linkSystemLibrary("SDL2");
-    exe.linkSystemLibrary("SDL_TTF");
+    exe.linkSystemLibrary("SDL2_TTF");
     exe.linkSystemLibrary("c");
 
     b.default_step.dependOn(&exe.step);

src/main.zig

@@ -1,11 +1,8 @@
 const std = @import("std");
 
 const c = @cImport({
-    @cInclude("SDL2/SDL.h");
+    @cInclude("SDL.h");
-});
+    @cInclude("SDL_ttf.h");
-
-const t = @cImport({
-    @cInclude("SDL/SDL_ttf.h");
 });
 
 const assert = @import("std").debug.assert;
@@ -36,18 +33,55 @@ pub fn main() !void {
 
     const source_code = @embedFile("GapProbeScan.cs");
 
-    const color_result = c.SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+    const color_result: c_int = c.SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
     if (color_result != 0) {
         c.SDL_Log("Unable to set draw color: %d", color_result);
         return error.SDLInitializationFailed;
     }
 
-    const ttf_init_result = t.TTF_Init();
+    // https://github.com/cirosantilli/cpp-cheat/blob/e52ed4b838e2697d8f44ab5bef3e7a170705d48e/sdl/ttf.c
+    const ttf_init_result: c_int = c.TTF_Init();
     if (ttf_init_result != 0) {
         c.SDL_Log("Unable to init TTF: %d", ttf_init_result);
         return error.TTFInitializationFailed;
     }
-    defer t.TTF_Quit();
+    defer c.TTF_Quit();
+
+    const text_color: c.SDL_Color = c.SDL_Color {
+        .r = 0,
+        .g = 0,
+        .b = 0,
+        .a = 255
+    };
+
+    // TODO: can we embed this file?
+    const font: ?*c.TTF_Font = c.TTF_OpenFont("FreeSans.ttf", 24);
+    if (font == null) {
+        const err = c.TTF_GetError();
+        c.SDL_Log("Unable to load font: %s", err);
+        return error.TTFFontLoadFailed;
+    }
+
+    const surface: [*c]c.SDL_Surface = c.TTF_RenderText_Solid(font, "Hello, World!", text_color);
+    if (surface == null) {
+        c.SDL_Log("Unable to render text");
+        return error.RenderTextFailed;
+    }
+    defer c.SDL_FreeSurface(surface);
+
+    const texture: ?*c.SDL_Texture = c.SDL_CreateTextureFromSurface(renderer, surface);
+    if (texture == null) {
+        c.SDL_Log("Unable to create texture from surface");
+        return error.CreateTextureFailed;
+    }
+    defer c.SDL_DestroyTexture(texture);
+
+    const rect = c.SDL_Rect {
+        .x = 0,
+        .y = 0,
+        .w = surface.*.w,
+        .h = surface.*.h,
+    };
 
     // const surface = c.SDL_GetWindowSurface(screen);
 
@@ -153,6 +187,15 @@ pub fn main() !void {
             x += 1;
         }
 
+        // Display text
+        if (c.SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255) != 0) {
+            c.SDL_Log("Unable to set draw color");
+        }
+
+        if (c.SDL_RenderCopy(renderer, texture, null, &rect) != 0) {
+            c.SDL_Log("Unable to render copy");
+        }
+
         c.SDL_RenderPresent(renderer);
 
         c.SDL_Delay(17);