abdelrahman/cg-from-scratch
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base: abdelrahman:e6a3b73f992f9bb33ba4ec7adf4cf3a38e1da05b
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abdelrahman:main
..
compare: abdelrahman:9fa4d4b4ecde2b1c49327a65c944292bcd77620d
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abdelrahman:main

No commits in common. "e6a3b73f992f9bb33ba4ec7adf4cf3a38e1da05b" and "9fa4d4b4ecde2b1c49327a65c944292bcd77620d" have entirely different histories.
e6a3b73f99 ... 9fa4d4b4ec

9 changed files with 0 additions and 261 deletions
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2
.gitignore vendored
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.cache
build_dir
compile_commands.json

4
.gitmodules vendored
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[submodule "include/c_cpp_aliases"]
path = include/c_cpp_aliases
url = https://git.thewizardapprentice.com/abdelrahman/c-cpp-aliases.git
branch = main

3
build
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#!/bin/bash
bear -- ./compile "$@"

16
compile
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#!/bin/bash
CC=clang
CFLAGS="-g -Wall -Werror -pedantic -Iinclude $(pkg-config --cflags sdl2)"
LIBS="$(pkg-config --libs sdl2)"
RAYTRACER_SRC="src/window/*.c \
src/raytracer/*.c \
"
BUILD=build_dir
RAYTRACER_OUT="$BUILD/raytracer"
mkdir -p $BUILD
(set -x ; $CC $CFLAGS $LIBS $RAYTRACER_SRC -o $RAYTRACER_OUT)

1
include/c_cpp_aliases

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Subproject commit f95f3aa499910286876c1f2cdceea8146ebcf7b1

31
include/window/window.h
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#ifndef WINDOW_H
#define WINDOW_H
#include "c_cpp_aliases/aliases.h"
#include <SDL2/SDL_video.h>
#include <stdbool.h>
typedef struct {
u8 r;
u8 g;
u8 b;
u8 a;
} colour_t;
typedef struct {
u64 width;
u64 height;
const char *title;
SDL_Window *window;
SDL_Surface *front_buffer;
SDL_Surface *back_buffer;
} window_t;
bool init_window(window_t *wnd, u64 width, u64 height, const char *title);
void close_window(window_t *wnd);
void clear_window(window_t *wnd, colour_t colour);
void set_pixel(window_t *wnd, f32 x, f32 y, colour_t colour);
void swap_buffers(window_t *wnd);
#endif // !WINDOW_H

23
run
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#!/bin/bash
USAGE="Usage: run (raytracer | rasteriser)"
if [[ $# == 0 ]]; then
echo $USAGE
exit 1
fi
while [[ $# -gt 0 ]]; do
case $1 in
raytracer)
RENDERER="raytracer"
shift # past argument
;;
-*|--*|*)
echo $USAGE
exit 1
;;
esac
done
./build_dir/$RENDERER

37
src/raytracer/main.c
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#include "SDL_events.h"
#include "c_cpp_aliases/aliases.h"
#include "window/window.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
colour_t bg = (colour_t){.r = 128, .g = 128, .b = 128, .a = 255};
window_t window = {0};
if (!init_window(&window, 1000, 800, "CG From Scratch")) {
return EXIT_FAILURE;
}
bool running = true;
SDL_Event event = {0};
while (running) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
running = false;
break;
}
}
clear_window(&window, bg);
swap_buffers(&window);
}
close_window(&window);
return EXIT_SUCCESS;
}

144
src/window/window.c
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#include "window/window.h"
#include "c_cpp_aliases/aliases.h"
#include <SDL2/SDL.h>
#include <SDL2/SDL_error.h>
#include <SDL2/SDL_pixels.h>
#include <SDL2/SDL_surface.h>
#include <stdbool.h>
#include <stdio.h>
#define NORMALISED_MIN -1.0f
#define NORMALISED_MAX 1.0f
u32 colour_to_u32(colour_t colour);
u32 index_from_coordinates(window_t *wnd, u32 x, u32 y);
i32 denormalise(f32 value, u32 max);
void set_screen_pixel(window_t *wnd, u32 x, u32 y, colour_t colour);
bool init_window(window_t *wnd, u64 width, u64 height, const char *title) {
if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
printf("Failed to initialise SDL: %s\n", SDL_GetError());
return false;
}
wnd->window = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, width, height, 0);
if (!(wnd->window)) {
printf("Failed to create window: %s\n", SDL_GetError());
close_window(wnd);
return false;
}
wnd->front_buffer = SDL_GetWindowSurface(wnd->window);
if (!(wnd->front_buffer)) {
printf("Failed to get front buffer: %s\n", SDL_GetError());
close_window(wnd);
return false;
}
wnd->back_buffer = SDL_CreateRGBSurfaceWithFormat(0, width, height, 32,
SDL_PIXELFORMAT_ABGR32);
if (!(wnd->back_buffer)) {
printf("Failed to create back buffer: %s\n", SDL_GetError());
close_window(wnd);
return false;
}
wnd->width = width;
wnd->height = height;
wnd->title = title;
return true;
}
void close_window(window_t *wnd) {
if (wnd) {
wnd->width = 0;
wnd->height = 0;
wnd->title = "";
if (wnd->window) {
SDL_DestroyWindow(wnd->window);
wnd->window = NULL;
}
if (wnd->back_buffer) {
SDL_FreeSurface(wnd->back_buffer);
wnd->back_buffer = NULL;
}
}
SDL_Quit();
}
void clear_window(window_t *wnd, colour_t colour) {
SDL_LockSurface(wnd->back_buffer);
u32 c = colour_to_u32(colour);
u32 *pixels = (u32 *)(wnd->back_buffer->pixels);
u32 count = wnd->back_buffer->w * wnd->back_buffer->h;
for (u32 i = 0; i < count; ++i) {
pixels[i] = c;
}
SDL_UnlockSurface(wnd->back_buffer);
}
void set_pixel(window_t *wnd, f32 x, f32 y, colour_t colour) {
i32 screen_x = denormalise(x, wnd->width);
i32 screen_y = denormalise(-y, wnd->height);
if (screen_x < 0 || screen_y < 0) {
return;
}
SDL_LockSurface(wnd->back_buffer);
set_screen_pixel(wnd, screen_x, screen_y, colour);
SDL_UnlockSurface(wnd->back_buffer);
}
void swap_buffers(window_t *wnd) {
SDL_BlitSurface(wnd->back_buffer, NULL, wnd->front_buffer, NULL);
SDL_UpdateWindowSurface(wnd->window);
}
u32 colour_to_u32(colour_t colour) {
return ((u32)(colour.r) << 24) | ((u32)(colour.g) << 16) |
((u32)(colour.b) << 8) | (u32)(colour.a);
}
u32 index_from_coordinates(window_t *wnd, u32 x, u32 y) {
return y * wnd->width + x;
}
i32 denormalise(f32 value, u32 max) {
if (max == 0 || value < NORMALISED_MIN || value >= NORMALISED_MAX) {
return -1;
}
return (i32)(((value - NORMALISED_MIN) * max) /
(NORMALISED_MAX - NORMALISED_MIN));
}
void set_screen_pixel(window_t *wnd, u32 x, u32 y, colour_t colour) {
u32 index = index_from_coordinates(wnd, x, y);
u32 c = colour_to_u32(colour);
u32 *pixels = (u32 *)(wnd->back_buffer->pixels);
pixels[index] = c;
}