gwj / graphics_tutorial · Commits

Commit 5b589ec3ec22303870595e96af6f506cae7c39cd

Authored by Grzegorz Jabłoński
0 parents

Initial version

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Showing 6 changed files with 235 additions and 0 deletions
hanoi/makefile 0 → 100755
  View file @5b589ec
  1 +++ a/hanoi/makefile
  1 +TARGET=sun
  2 +
  3 +all: $(TARGET)
  4 +
  5 +%.o:%.c
  6 + gcc -g -I.. -Wall -pedantic `sdl2-config --cflags` -c $< -o $@
  7 +
  8 +%: %.c ../primlib.o %.c
  9 + gcc -g -I.. -Wall -pedantic `sdl2-config --cflags` ../primlib.o $< -o $@ -lSDL2_gfx `sdl2-config --libs`
  10 +
  11 +../primlib.o: ../primlib.c ../primlib.h
  12 +
  13 +$(TARGET): $(TARGET).c ../primlib.h
  14 +
  15 +clean:
  16 + -rm $(TARGET)
0 \ No newline at end of file 17 \ No newline at end of file
hanoi/sun.c 0 → 100644
  View file @5b589ec
  1 +++ a/hanoi/sun.c
  1 +#include "primlib.h"
  2 +#include <stdlib.h>
  3 +#include <unistd.h>
  4 +
  5 +int main(int argc, char *argv[]) {
  6 + if (gfx_init())
  7 + exit(3);
  8 + /* clear screen */
  9 + gfx_filledRect(0, 0, gfx_screenWidth() - 1, gfx_screenHeight() - 1, BLUE);
  10 + gfx_filledCircle(gfx_screenWidth() / 2, gfx_screenHeight() / 4, 100, YELLOW);
  11 + gfx_updateScreen();
  12 + gfx_getkey();
  13 + return 0;
  14 +}
makefile 0 → 100644
  View file @5b589ec
  1 +++ a/makefile
  1 +all: testlib
  2 +
  3 +testlib: testlib.o primlib.o
  4 + gcc -g $^ -o $@ -lSDL2_gfx `sdl2-config --libs`
  5 +
  6 +.c.o:
  7 + gcc -g -Wall -pedantic `sdl2-config --cflags` -c $<
  8 +
  9 +primlib.o: primlib.c primlib.h
  10 +
  11 +testlib.o: testlib.c primlib.h
  12 +
  13 +clean:
  14 + -rm primlib.o testlib.o testlib
0 \ No newline at end of file 15 \ No newline at end of file
primlib.c 0 → 100644
  View file @5b589ec
  1 +++ a/primlib.c
  1 +#include <assert.h>
  2 +#include <math.h>
  3 +#include <stdio.h>
  4 +#include <stdlib.h>
  5 +#include <string.h>
  6 +#include <time.h>
  7 +
  8 +#include "primlib.h"
  9 +
  10 +static SDL_Renderer *renderer = NULL;
  11 +static SDL_Window *window = NULL;
  12 +
  13 +// static Uint32 colors[COLOR_MAX] = {0xff000000,
  14 +// 0xff0000ff, 0xff00ff00, 0xffff0000,
  15 +// 0xffffff00, 0xffff00ff, 0xff00ffff,
  16 +// 0xffffffff};
  17 +
  18 +struct RGB {
  19 + uint8_t r;
  20 + uint8_t g;
  21 + uint8_t b;
  22 +};
  23 +
  24 +static struct RGB colors[COLOR_MAX] = {
  25 + {0, 0, 0}, {255, 0, 0}, {0, 255, 0}, {0, 0, 255},
  26 + {0, 255, 255}, {255, 0, 255}, {255, 255, 0}, {255, 255, 255}};
  27 +
  28 +// Screen dimension constants
  29 +const int SCREEN_WIDTH = 640;
  30 +const int SCREEN_HEIGHT = 480;
  31 +
  32 +void gfx_pixel(int x, int y, enum color c) {
  33 + pixelRGBA(renderer, x, y, colors[c].r, colors[c].g, colors[c].b, 255);
  34 +}
  35 +
  36 +void gfx_line(int x1, int y1, int x2, int y2, enum color c) {
  37 + assert(c < COLOR_MAX);
  38 + lineRGBA(renderer, x1, y1, x2, y2, colors[c].r, colors[c].g, colors[c].b,
  39 + 255);
  40 +}
  41 +
  42 +void gfx_rect(int x1, int y1, int x2, int y2, enum color c) {
  43 + assert(c < COLOR_MAX);
  44 + rectangleRGBA(renderer, x1, y1, x2, y2, colors[c].r, colors[c].g, colors[c].b,
  45 + 255);
  46 +}
  47 +
  48 +void gfx_filledRect(int x1, int y1, int x2, int y2, enum color c) {
  49 + assert(c < COLOR_MAX);
  50 + boxRGBA(renderer, x1, y1, x2, y2, colors[c].r, colors[c].g, colors[c].b, 255);
  51 +}
  52 +
  53 +void gfx_circle(int x, int y, int r, enum color c) {
  54 + assert(c < COLOR_MAX);
  55 + circleRGBA(renderer, x, y, r, colors[c].r, colors[c].g, colors[c].b, 255);
  56 +}
  57 +
  58 +void gfx_filledCircle(int x, int y, int r, enum color c) {
  59 + assert(c < COLOR_MAX);
  60 + filledCircleRGBA(renderer, x, y, r, colors[c].r, colors[c].g, colors[c].b,
  61 + 255);
  62 +}
  63 +
  64 +int gfx_screenWidth() { return SCREEN_WIDTH; }
  65 +
  66 +int gfx_screenHeight() { return SCREEN_HEIGHT; }
  67 +
  68 +void gfx_updateScreen() {
  69 + SDL_RenderPresent(renderer);
  70 + SDL_RenderClear(renderer);
  71 +}
  72 +
  73 +void gfx_textout(int x, int y, const char *s, enum color c) {
  74 + assert(c < COLOR_MAX);
  75 + stringRGBA(renderer, x, y, s, colors[c].r, colors[c].g, colors[c].b, 255);
  76 +}
  77 +
  78 +int gfx_pollkey() {
  79 + SDL_Event event;
  80 + while (SDL_PollEvent(&event)) {
  81 + switch (event.type) {
  82 + case SDL_KEYDOWN:
  83 + return event.key.keysym.sym;
  84 + case SDL_QUIT:
  85 + exit(3);
  86 + }
  87 + }
  88 + return -1;
  89 +}
  90 +
  91 +int gfx_getkey() {
  92 + SDL_Event event;
  93 + while (1) {
  94 + SDL_WaitEvent(&event);
  95 + if (event.type == SDL_KEYDOWN)
  96 + break;
  97 + if (event.type == SDL_QUIT)
  98 + exit(3);
  99 + };
  100 + return event.key.keysym.sym;
  101 +}
  102 +
  103 +int gfx_isKeyDown(int key) {
  104 + const Uint8 *keytable;
  105 + int numkeys;
  106 + SDL_PumpEvents();
  107 + keytable = SDL_GetKeyboardState(&numkeys);
  108 + SDL_Scancode code = SDL_GetScancodeFromKey(key);
  109 + assert(code < numkeys);
  110 + return keytable[code];
  111 +}
  112 +
  113 +static void gfx_close() {
  114 + SDL_DestroyRenderer(renderer);
  115 + SDL_DestroyWindow(window);
  116 + SDL_Quit();
  117 +}
  118 +
  119 +int gfx_init() {
  120 +
  121 + /* Initialize SDL */
  122 + if (SDL_Init(SDL_INIT_VIDEO) < 0) {
  123 + fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
  124 + return 1;
  125 + }
  126 + atexit(gfx_close);
  127 +
  128 + window = SDL_CreateWindow("SDL", SDL_WINDOWPOS_UNDEFINED,
  129 + SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH,
  130 + SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
  131 + if (window == NULL) {
  132 + printf("Window could not be created! SDL Error: %s\n", SDL_GetError());
  133 + exit(3);
  134 + } else {
  135 + // Create renderer for window
  136 + renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
  137 + if (renderer == NULL) {
  138 + printf("Renderer could not be created! SDL Error: %s\n", SDL_GetError());
  139 + exit(3);
  140 + }
  141 + }
  142 +
  143 + SDL_Delay(10);
  144 + return 0;
  145 +}
primlib.h 0 → 100644
  View file @5b589ec
  1 +++ a/primlib.h
  1 +#ifndef __PRIMLIB_H__
  2 +#define __PRIMLIB_H__
  3 +
  4 +#include <SDL2/SDL.h>
  5 +#include <SDL2/SDL2_gfxPrimitives.h>
  6 +int gfx_init();
  7 +enum color { BLACK, RED, GREEN, BLUE, CYAN, MAGENTA, YELLOW, WHITE, COLOR_MAX };
  8 +void gfx_pixel(int x, int y, enum color c);
  9 +void gfx_line(int x1, int y1, int x2, int y2, enum color c);
  10 +void gfx_circle(int x, int y, int r, enum color c);
  11 +void gfx_filledRect(int x1, int y1, int x2, int y2, enum color c);
  12 +void gfx_filledCircle(int x, int y, int r, enum color c);
  13 +void gfx_rect(int x1, int y1, int x2, int y2, enum color c);
  14 +void gfx_textout(int x, int y, const char *s, enum color c);
  15 +int gfx_screenWidth();
  16 +int gfx_screenHeight();
  17 +void gfx_updateScreen();
  18 +int gfx_pollkey();
  19 +int gfx_getkey();
  20 +int gfx_isKeyDown(int key);
  21 +
  22 +#endif /* __PRIMLIB_H__ */
testlib.c 0 → 100644
  View file @5b589ec
  1 +++ a/testlib.c
  1 +#include "primlib.h"
  2 +#include <stdlib.h>
  3 +#include <unistd.h>
  4 +
  5 +int main(int argc, char *argv[]) {
  6 + if (gfx_init())
  7 + exit(3);
  8 + /* clear screen */
  9 + for (int i = -99; i < 100; ++i) {
  10 + gfx_filledRect(0, 0, gfx_screenWidth() - 1, gfx_screenHeight() - 1, BLACK);
  11 + gfx_filledCircle(gfx_screenWidth() / 2 + i, gfx_screenHeight() / 2, 100, YELLOW);
  12 + gfx_textout(gfx_screenWidth() / 2 - i, gfx_screenHeight() / 2, "This is a text", RED);
  13 + gfx_updateScreen();
  14 + SDL_Delay(10);
  15 + }
  16 + gfx_getkey();
  17 + return 0;
  18 +}