95 lines
2.1 KiB
D
95 lines
2.1 KiB
D
module window;
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import derelict.sdl2.sdl;
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import glad.gl.all;
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/**
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* Converts an integer representing a colour, for example 0x428bca into a 4 element
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* int array for passing to OpenGL.
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*/
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GLfloat[4] to(T : GLfloat[4])(int color, ubyte alpha = 255) nothrow @nogc pure {
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GLfloat[4] gl_color = [ //mask out r, g, b components from int
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cast(float)cast(ubyte)(color>>16)/255,
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cast(float)cast(ubyte)(color>>8)/255,
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cast(float)cast(ubyte)(color)/255,
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cast(float)cast(ubyte)(alpha)/255
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];
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return gl_color;
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} // to!GLfloat[4]
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struct Window {
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import core.stdc.stdio;
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import core.stdc.stdlib;
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SDL_Window* window;
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SDL_GLContext context;
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void create_window(int w, int h, const char* title = "Chipd8 Emu") {
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assert(w > 0, "window width must be > 0");
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assert(h > 0, "window height must be > 0");
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// minimum OpenGL 3.3
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 32);
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SDL_Window* new_win = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w, h, SDL_WINDOW_OPENGL);
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if (new_win == null) {
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printf("SDL2 - Window could not be created: %s\n", SDL_GetError());
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return;
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}
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SDL_GLContext new_con = SDL_GL_CreateContext(new_win);
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if (new_con == null) {
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printf("SDL2 - failed creating OpenGL 3.3 context: %s\n", SDL_GetError());
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return;
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}
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// assign em yes
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window = new_win;
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context = new_con;
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atexit(SDL_Quit);
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} // create_window
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void handle_event(ref SDL_Event ev) {
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}
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void render_clear(int colour) {
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auto col = to!GLColor(color, 255);
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glClearColor(col[0], col[1], col[2], col[3]);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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void render_present() {
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SDL_GL_SwapWindow(window);
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}
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@property nothrow @nogc {
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int[2] window_size() {
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int w, h;
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SDL_GetWindowSize(window, &w, &h);
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return [w, h];
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}
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int[2] framebuffer_size() {
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int w, h;
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SDL_GL_GetDrawableSize(window, &w, &h);
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return [w, h];
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}
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}
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} // Window
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