Added background image, TTF loading, rgb color struct

src/game_state.zig

@@ -6,6 +6,8 @@ pub const GameState = struct {
     r: u8 = 0xff,
     g: u8 = 0xff,
     b: u8 = 0xff,
+    SCREEN_WIDTH: u32 = 640,
+    SCREEN_HEIGHT: u32 = 480,
     slime_factory: sf.SlimeFactory = undefined,
     renderer: *sdl.struct_SDL_Renderer = undefined,
 

src/main.zig

@@ -6,6 +6,8 @@ const assert = std.debug.assert;
 const SCREEN_WIDTH = 640;
 const SCREEN_HEIGHT = 480;
 const log = sdl.SDL_Log;
+const GameText = @import("./text.zig").GameText;
+const RGBAColor = @import("./utils/rgb_color.zig").RGBAColor;
 
 var window: *sdl.struct_SDL_Window = undefined;
 // var screen_surface: *sdl.struct_SDL_Surface = undefined;
@@ -24,8 +26,11 @@ pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const allocator = gpa.allocator();
 
-    const texture = try atils.loadTexture(renderer, "assets/png_test.png");
-    defer sdl.SDL_DestroyTexture(texture);
+    const bg_texture = try atils.loadTexture(renderer, "assets/background.png");
+    defer sdl.SDL_DestroyTexture(bg_texture);
+
+    try GameText.initFont();
+    defer GameText.deinitFont();
 
     // var slime_factory = try sf.SlimeFactory.init(allocator, renderer);
     // defer slime_factory.deinit();
@@ -86,13 +91,10 @@ pub fn main() !void {
         }
         _ = sdl.SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, 0xff);
         _ = sdl.SDL_RenderClear(renderer);
-        std.debug.print("r:{x} g:{x} b:{x}\n", .{
-            game_state.r,
-            game_state.g,
-            game_state.b,
-        });
-
+        _ = sdl.SDL_RenderCopy(renderer, bg_texture, null, null);
         game_state.update_tick();
+        var text = try GameText.loadFromRenderedText("Test 123", RGBAColor.whiteSmoke().tosdl());
+        try text.render(&game_state);
 
         // Render red rect
         // const fill_rect: sdl.struct_SDL_Rect = sdl.SDL_Rect{ .x = SCREEN_WIDTH / 4, .y = SCREEN_HEIGHT / 4, .w = SCREEN_WIDTH / 2 + img_pos.x, .h = SCREEN_HEIGHT / 2 + img_pos.y };
@@ -105,7 +107,7 @@ pub fn main() !void {
         // _ = sdl.SDL_BlitScaled(zig_image, &src_rect, screen_surface, &dest_rect);
 
         // _ = sdl.SDL_UpdateWindowSurface(window);
-        sdl.SDL_Delay(117);
+        sdl.SDL_Delay(100);
     }
     return;
 }
@@ -138,11 +140,17 @@ fn init() !void {
         log("Unable to initialize SDL Image: %s\n", sdl.IMG_GetError());
         return error.SDLInitializationFailed;
     }
+
+    if (sdl.TTF_Init() < 0) {
+        log("Unable to initialize SDL TTF: %s\n", sdl.TTF_GetError());
+        return error.SDLInitializationFailed;
+    }
 }
 
 fn close() void {
     sdl.SDL_DestroyRenderer(renderer);
     sdl.SDL_DestroyWindow(window);
     sdl.IMG_Quit();
+    sdl.TTF_Quit();
     sdl.SDL_Quit();
 }

src/sdl.zig

@@ -1,4 +1,5 @@
 pub const c = @cImport({
     @cInclude("SDL2/SDL.h");
     @cInclude("SDL2/SDL_image.h");
+    @cInclude("SDL2/SDL_ttf.h");
 });

src/slime_factory.zig

@@ -3,12 +3,19 @@ const sdl = @import("sdl.zig").c;
 const atils = @import("./asset_utils.zig");
 const GameState = @import("./game_state.zig").GameState;
 const slime_sprite_sheet_texture_path = "assets/slime_still.png";
+const rgba = @import("./utils/rgb_color.zig").RGBAColor;
 
 pub const Slime = struct {
     total_frames: u8 = 6,
     x: i32 = 64,
-    y: i32 = 64,
+    y: i32 = 300,
     f: u16 = 0,
+    color: rgba = .{
+        .r = 0xd5,
+        .g = 0x0f,
+        .b = 0x65,
+        .a = 110,
+    },
 };
 
 pub const SlimeFactory = struct {
@@ -17,6 +24,11 @@ pub const SlimeFactory = struct {
 
     pub fn init(allocator: std.mem.Allocator, renderer: *sdl.struct_SDL_Renderer) !SlimeFactory {
         const texture = try atils.loadTexture(renderer, slime_sprite_sheet_texture_path);
+        const val = sdl.SDL_SetTextureBlendMode(texture, sdl.SDL_BLENDMODE_BLEND);
+        if (val != 0) {
+            sdl.SDL_Log("Failed to set blend mode: %s", sdl.SDL_GetError());
+            return error.FailedToSetBlendMode;
+        }
         return .{
             .slimes = std.ArrayList(Slime).init(allocator),
             .slime_sprite_sheet_texture = texture,
@@ -33,12 +45,21 @@ pub const SlimeFactory = struct {
     }
 
     pub fn render(sf: *SlimeFactory, game_state: *GameState) void {
-        _ = sdl.SDL_SetTextureColorMod(sf.slime_sprite_sheet_texture, game_state.r, game_state.g, game_state.b);
+        if (sf.slimes.items.len == 0) return;
+
+        const slime_color = sf.slimes.items[0].color;
+
+        _ = sdl.SDL_SetTextureColorMod(
+            sf.slime_sprite_sheet_texture,
+            slime_color.r,
+            slime_color.g,
+            slime_color.b,
+        );
+        _ = sdl.SDL_SetTextureAlphaMod(sf.slime_sprite_sheet_texture, slime_color.a);
         for (sf.slimes.items, 0..) |slime, s_idx| {
-            std.debug.print("Slime {d}:\t{}\n", .{ s_idx + 1, slime });
             const sprite_frame_x_dim: u16 = slime.f * 64;
             const sprite_frame_rect: sdl.struct_SDL_Rect = .{ .x = sprite_frame_x_dim, .y = 0, .w = 64, .h = 64 };
-            const dest_rect: sdl.struct_SDL_Rect = .{ .x = slime.x, .y = slime.y, .w = 128, .h = 128 };
+            const dest_rect: sdl.struct_SDL_Rect = .{ .x = slime.x, .y = slime.y, .w = 64, .h = 64 };
             _ = sdl.SDL_RenderCopy(game_state.renderer, sf.slime_sprite_sheet_texture, &sprite_frame_rect, &dest_rect);
             sf.slimes.items[s_idx].f = (sf.slimes.items[s_idx].f + 1) % sf.slimes.items[s_idx].total_frames;
         }

src/text.zig

@@ -0,0 +1,84 @@
+const sdl = @import("./sdl.zig").c;
+const std = @import("std");
+const GameState = @import("./game_state.zig").GameState;
+
+var font: ?*sdl.TTF_Font = null;
+var text_texture: ?*sdl.SDL_Texture = null;
+var text_init = false;
+
+pub const GameText = struct {
+    text: []const u8,
+    color: sdl.SDL_Color,
+    surface: *sdl.SDL_Surface,
+    w: u32,
+    h: u32,
+
+    pub fn loadFromRenderedText(text: []const u8, color: sdl.SDL_Color) !GameText {
+        const c_text: [*c]const u8 = @ptrCast(text);
+        const text_surface: [*c]sdl.SDL_Surface = sdl.TTF_RenderText_Solid(font.?, c_text, color) orelse {
+            sdl.SDL_Log("Error loading text surface: %s\n", sdl.SDL_GetError());
+            return error.FailedToRenderSurface;
+        };
+
+        return .{
+            .surface = text_surface,
+            .text = text,
+            .color = color,
+            .w = @intCast(text_surface.*.w),
+            .h = @intCast(text_surface.*.h),
+        };
+    }
+
+    pub fn deinit(self: *GameText) void {
+        sdl.SDL_FreeSurface(self.text_surface);
+    }
+
+    pub fn setBlendMode(self: *GameText, blend: sdl.SDL_BlendMode) !void {
+        _ = self;
+        _ = blend;
+        return error.Unimplemented;
+    }
+
+    pub fn setAlpha(self: *GameText, alpha: u8) !void {
+        _ = self;
+        _ = alpha;
+        return error.Unimplemented;
+    }
+
+    pub fn render(self: *GameText, game_state: *GameState) !void {
+        if (!text_init) {
+            return error.TextNotInitialized;
+        }
+
+        if (text_texture != null) {
+            sdl.SDL_DestroyTexture(text_texture);
+            text_texture = null;
+        }
+
+        // TODO dont create new texture if unchanged
+        text_texture = sdl.SDL_CreateTextureFromSurface(game_state.renderer, self.surface) orelse {
+            sdl.SDL_Log("Error loading text texture: %s\n", sdl.SDL_GetError());
+            return error.FailedToRenderTexture;
+        };
+
+        const srcr = sdl.SDL_Rect{ .x = 0, .y = 0, .w = @intCast(self.w), .h = @intCast(self.h) };
+        const destr = sdl.SDL_Rect{ .x = @intCast(game_state.SCREEN_WIDTH - self.w), .y = 10, .w = @intCast(self.w), .h = @intCast(self.h) };
+        _ = sdl.SDL_RenderCopy(game_state.renderer, text_texture, &srcr, &destr);
+    }
+
+    pub fn initFont() !void {
+        const loaded_font = sdl.TTF_OpenFont("./assets/fonts/DepartureMonoNF-Regular.ttf", 24) orelse {
+            sdl.SDL_Log("Error loading ttf font: %s\n", sdl.TTF_GetError());
+            return error.FailedToLoadFont;
+        };
+
+        font = loaded_font;
+        text_init = true;
+    }
+
+    pub fn deinitFont() void {
+        sdl.SDL_DestroyTexture(text_texture);
+        sdl.TTF_CloseFont(font);
+        text_init = false;
+    }
+};

src/utils/rgb_color.zig

@@ -0,0 +1,116 @@
+const sdl = @import("../sdl.zig").c;
+
+pub const RGBAColor = struct {
+    r: u8,
+    g: u8,
+    b: u8,
+    a: u8,
+
+    pub fn white() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0xff,
+            .b = 0xff,
+            .a = 0xff,
+        };
+    }
+
+    pub fn black() RGBAColor {
+        return .{
+            .r = 0x00,
+            .g = 0x00,
+            .b = 0x00,
+            .a = 0xff,
+        };
+    }
+
+    pub fn red() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0x00,
+            .b = 0x00,
+            .a = 0xff,
+        };
+    }
+
+    pub fn green() RGBAColor {
+        return .{
+            .r = 0x00,
+            .g = 0xff,
+            .b = 0x00,
+            .a = 0xff,
+        };
+    }
+
+    pub fn blue() RGBAColor {
+        return .{
+            .r = 0x00,
+            .g = 0x00,
+            .b = 0xff,
+            .a = 0xff,
+        };
+    }
+
+    pub fn yellow() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0xff,
+            .b = 0x00,
+            .a = 0xff,
+        };
+    }
+
+    pub fn cyan() RGBAColor {
+        return .{
+            .r = 0x00,
+            .g = 0xff,
+            .b = 0xff,
+            .a = 0xff,
+        };
+    }
+
+    pub fn magenta() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0x00,
+            .b = 0xff,
+            .a = 0xff,
+        };
+    }
+
+    pub fn whiteSmoke() RGBAColor {
+        return .{
+            .r = 0xf5,
+            .g = 0xf5,
+            .b = 0xf5,
+            .a = 0xff,
+        };
+    }
+
+    pub fn orange() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0xa5,
+            .b = 0x00,
+            .a = 0xff,
+        };
+    }
+
+    pub fn pink() RGBAColor {
+        return .{
+            .r = 0xff,
+            .g = 0xc0,
+            .b = 0xcb,
+            .a = 0xff,
+        };
+    }
+
+    pub fn tosdl(self: *const RGBAColor) sdl.SDL_Color {
+        return .{
+            .r = self.r,
+            .g = self.g,
+            .b = self.b,
+            .a = self.a,
+        };
+    }
+};