112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
#include <stdio.h>
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#include "display.h"
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SDL_Window* window = NULL;
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SDL_Renderer* renderer = NULL;
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uint32_t* color_buffer = NULL;
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SDL_Texture* color_buffer_texture = NULL;
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int window_width = 800;
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int window_height = 600;
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bool initialize_window(void) {
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if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
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fprintf(stderr, "Error initializing SDL.\n");
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return false;
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}
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// Set width and height of the SDL window with the max screen resolution
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SDL_DisplayMode display_mode;
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SDL_GetCurrentDisplayMode(0, &display_mode);
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window_width = display_mode.w;
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window_height = display_mode.h;
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// Create a SDL Window
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window = SDL_CreateWindow(
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NULL,
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SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED,
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window_width,
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window_height,
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SDL_WINDOW_BORDERLESS
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);
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if (!window) {
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fprintf(stderr, "Error creating SDL window.\n");
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return false;
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}
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// Create a SDL renderer
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renderer = SDL_CreateRenderer(window, -1, 0);
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if (!renderer) {
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fprintf(stderr, "Error creating SDL renderer.\n");
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return false;
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}
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return true;
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}
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void draw_grid(void) {
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for (int y = 0; y < window_height; y += 10) {
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for (int x = 0; x < window_width; x += 10) {
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color_buffer[(window_width * y) + x] = 0xFF444444;
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}
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}
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}
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void draw_pixel(int x, int y, uint32_t color) {
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if (x >= 0 && x < window_width && y >= 0 && y < window_height) {
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color_buffer[(window_width * y) + x] = color;
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}
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}
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void draw_line(int x0, int y0, int x1, int y1, uint32_t color) {
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int delta_x = (x1 - x0);
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int delta_y = (y1 - y0);
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int longest_side_length = (abs(delta_x) >= abs(delta_y)) ? abs(delta_x) : abs(delta_y);
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float x_inc = delta_x / (float)longest_side_length;
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float y_inc = delta_y / (float)longest_side_length;
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float current_x = x0;
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float current_y = y0;
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for (int i = 0; i <= longest_side_length; i++) {
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draw_pixel(round(current_x), round(current_y), color);
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current_x += x_inc;
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current_y += y_inc;
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}
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}
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void draw_rect(int x, int y, int width, int height, uint32_t color) {
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for (int i = 0; i < width; i++) {
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for (int j = 0; j < height; j++) {
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int current_x = x + i;
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int current_y = y + j;
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draw_pixel(current_x, current_y, color);
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}
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}
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}
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void render_color_buffer(void) {
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SDL_UpdateTexture(
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color_buffer_texture,
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NULL,
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color_buffer,
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(int)(window_width * sizeof(uint32_t))
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);
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SDL_RenderCopy(renderer, color_buffer_texture, NULL, NULL);
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}
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void clear_color_buffer(uint32_t color) {
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for (int y = 0; y < window_height; y++) {
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for (int x = 0; x < window_width; x++) {
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color_buffer[(window_width * y) + x] = color;
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}
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}
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}
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void destroy_window(void) {
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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}
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