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Add changes to control the bmp image with key events, added chatgpt to links ;)

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This commit is contained in:
Nathan Anderson 2024-12-31 11:15:03 -07:00
parent 834dad44ee
commit b40253c895
2 changed files with 75 additions and 45 deletions
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4
.fflinks Normal file
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@ -0,0 +1,4 @@
https://lazyfoo.net/tutorials/SDL/index.php
https://ziglang.org/documentation/0.13.0/std/
https://ziglang.org/documentation/0.13.0/
https://chatgpt.com/

116
src/main.zig
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@ -4,45 +4,25 @@ const c = @cImport({
const std = @import("std");
const assert = std.debug.assert;
const SCREEN_WIDTH = 640;
const SCREEN_HEIGHT = 480;
const log = c.SDL_Log;
var window: *c.struct_SDL_Window = undefined;
var screen_surface: *c.struct_SDL_Surface = undefined;
var zig_image: *c.struct_SDL_Surface = undefined;
const Offset = struct {
x: i32,
y: i32,
};
var img_pos: Offset = .{ .x = 0, .y = 0 };
pub fn main() !void {
if (c.SDL_Init(c.SDL_INIT_VIDEO) != 0) {
c.SDL_Log("Unable to initialize SDL: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
}
defer c.SDL_Quit();
try init();
defer close();
const screen = c.SDL_CreateWindow("My Game Window", c.SDL_WINDOWPOS_UNDEFINED, c.SDL_WINDOWPOS_UNDEFINED, 400, 140, c.SDL_WINDOW_OPENGL) orelse
{
c.SDL_Log("Unable to create window: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
};
defer c.SDL_DestroyWindow(screen);
const renderer = c.SDL_CreateRenderer(screen, -1, 0) orelse {
c.SDL_Log("Unable to create renderer: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
};
defer c.SDL_DestroyRenderer(renderer);
const zig_bmp = @embedFile("zig.bmp");
const rw = c.SDL_RWFromConstMem(zig_bmp, zig_bmp.len) orelse {
c.SDL_Log("Unable to get RWFromConstMem: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
};
defer assert(c.SDL_RWclose(rw) == 0);
const zig_surface = c.SDL_LoadBMP_RW(rw, 0) orelse {
c.SDL_Log("Unable to load bmp: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
};
defer c.SDL_FreeSurface(zig_surface);
const zig_texture = c.SDL_CreateTextureFromSurface(renderer, zig_surface) orelse {
c.SDL_Log("Unable to create texture from surface: %s", c.SDL_GetError());
return error.SDLInitializationFailed;
};
defer c.SDL_DestroyTexture(zig_texture);
try loadMedia();
var src_rect: c.struct_SDL_Rect = c.SDL_Rect{ .x = 10, .y = 10, .w = 400, .h = 140 };
var quit = false;
while (!quit) {
@ -52,21 +32,67 @@ pub fn main() !void {
c.SDL_QUIT => {
quit = true;
},
c.SDL_KEYDOWN => {
switch (event.key.keysym.sym) {
c.SDLK_UP => {
img_pos.y = img_pos.y - 5;
},
c.SDLK_DOWN => {
img_pos.y = img_pos.y + 5;
},
c.SDLK_LEFT => {
img_pos.x = img_pos.x + 5;
},
c.SDLK_RIGHT => {
img_pos.x = img_pos.x - 5;
},
else => {},
}
log("Got key event: %i\n", event.key.keysym.sym);
},
else => {},
}
}
_ = c.SDL_FillRect(screen_surface, null, c.SDL_MapRGB(screen_surface.format, 0xff, 0xff, 0xff));
var dest_rect = c.SDL_Rect{ .x = src_rect.x + img_pos.x, .y = src_rect.y + img_pos.y, .w = src_rect.w, .h = src_rect.h };
_ = c.SDL_BlitSurface(zig_image, &src_rect, screen_surface, &dest_rect);
_ = c.SDL_RenderClear(renderer);
_ = c.SDL_RenderCopy(renderer, zig_texture, null, null);
c.SDL_RenderPresent(renderer);
_ = c.SDL_UpdateWindowSurface(window);
c.SDL_Delay(17);
}
return;
}
fn init() !void {
// Init SDL with video subsystem flag
if (c.SDL_Init(c.SDL_INIT_VIDEO) < 0) {
log("Unable to initialize SDL: %s\n", c.SDL_GetError());
return error.SDLInitializationFailed;
}
const opt_window = c.SDL_CreateWindow("Game Window", c.SDL_WINDOWPOS_UNDEFINED, c.SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, c.SDL_WINDOW_SHOWN);
if (opt_window == null) {
log("Unable to initialize SDL window: %s\n", c.SDL_GetError());
return error.SDLInitializationFailed;
}
window = opt_window.?;
// get surface and fill with white
screen_surface = c.SDL_GetWindowSurface(window);
}
fn loadMedia() !void {
const image: [*c]c.struct_SDL_Surface = c.SDL_LoadBMP("src/zig.bmp");
if (image == null) {
log("Unable to load media: %s\n", c.SDL_GetError());
return error.SDLLoadError;
} else {
zig_image = image;
}
}
test "simple test" {
var list = std.ArrayList(i32).init(std.testing.allocator);
defer list.deinit(); // try commenting this out and see if zig detects the memory leak!
try list.append(42);
try std.testing.expectEqual(@as(i32, 42), list.pop());
fn close() void {
c.SDL_FreeSurface(zig_image);
c.SDL_DestroyWindow(window);
c.SDL_Quit();
}