ultimecia

commit a7c7896e6dd263cca660f033abc6c91b42db4b43
parent c338c94a7b282fe9da78e4ce19dbdf81258f198a
Author: root <root@lunarcry>
Date:   Sun, 29 Sep 2024 09:05:09 +0000

A start for a software renderer??..

Diffstat:
M
src/renderer.h
 | 
1
-
A
src/sr/sr.c
 | 
91
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 91 insertions(+), 1 deletion(-)
diff --git a/src/renderer.h b/src/renderer.h
@@ -14,7 +14,6 @@ typedef struct _R_Color {
     u8 b;
 } R_Color;
 
-
 typedef struct _RENDERER {
     SDL_Window* window;
     SDL_Surface* surface;
diff --git a/src/sr/sr.c b/src/sr/sr.c
@@ -0,0 +1,91 @@
+/* Based software renderer in one file */
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+#include <SDL2/SDL.h>
+#define W 512
+#define H 512 
+
+typedef void v; typedef uint8_t u8;typedef uint16_t u16;typedef uint32_t u32;typedef uint64_t u64;typedef int8_t i8;typedef int16_t i16;typedef int32_t i32;typedef int64_t i64;typedef uint8_t	Bool;
+typedef struct { u32 *data; } FB;
+typedef struct {u8 b;u8 g;u8 r; u8 a;} C;
+FB fb; SDL_Window* win; SDL_Renderer* ren;
+C* 
+new_C(u32 b) 
+{ 
+    C* c = malloc(sizeof(C)); 
+    c->r = (u8)(b & 0xff); 
+    c->g = (u8)((b >> 8) & 0xff); 
+    c->b = (u8)((b >> 16) & 0xff); 
+    c->a = (u8)((b >> 24) & 0xff); 
+    return c;
+};
+
+v new_fb() { fb.data = malloc(W*H*sizeof(u32));}
+u8 FB_set(int x, int y, C c, i8 *res) { (!fb.data || x<0 || y<0 || x>=W || y>=H) ? (void)(*res = 0) : memcpy(fb.data + ((x + y * W)), &c, 4); }
+C* FB_get(int x, int y) {
+	void* c = (!fb.data || x<0 || y<0 || x>=W || y>=H) ? (void*)0 : (void*)(new_C(fb.data[(x+y*W)]));
+    return (C*)c;
+}
+void line(int x0, int y0, int x1, int y1, C color) { 
+    i8 res = 1;
+    int tmp;
+    int steep = 0; 
+    if (abs(x0-x1)<abs(y0-y1)) { 
+        tmp = x0; x0 = y0; y0 = tmp;
+        tmp = x1; x1 = y1; y1 = tmp;
+        steep = 1; 
+    } 
+    if (x0>x1) { 
+        tmp = x0; x0 = x1; x1 = tmp;
+        tmp = y0; y0 = y1; y1 = tmp;
+    } 
+    int dx = x1-x0; 
+    int dy = y1-y0; 
+    int derror2 = abs(dy)*2; 
+    int error2 = 0; 
+    int y = y0; 
+    for (int x=x0; x<=x1; x++) { 
+        steep ? FB_set(y, x, color, &res) : FB_set(x, y, color, &res); 
+        error2 += derror2; 
+        if (error2 > dx) { 
+            y += (y1>y0?1:-1); 
+            error2 -= dx*2; 
+        } 
+    } 
+}
+
+void
+init_sdl() {
+    win= SDL_CreateWindow("Ultimecia", 0, 0, 512, 512, SDL_WINDOW_RESIZABLE);
+    ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_SOFTWARE);
+}
+
+void drw_ls()
+{
+    line(13, 20, 80, 40, (C){0xff, 0xff, 0xff, 0xff}); 
+    line(20, 13, 40, 80, (C){0xff, 0x0, 0x0, 255}); 
+    line(80, 40, 13, 20, (C){0, 255, 0, 100});
+}
+
+int
+main() 
+{
+    SDL_Init(SDL_INIT_VIDEO);
+    init_sdl();
+
+    i8 res = 1;
+    new_fb(); memset(fb.data, 0, (u32)(W*H)*sizeof(u32));
+    drw_ls();
+
+    SDL_Texture* texture = SDL_CreateTexture(ren, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, 512, 512);
+
+    SDL_UpdateTexture(texture, NULL, fb.data, W * sizeof(Uint32));
+    SDL_RenderClear(ren);
+    SDL_RenderCopy(ren, texture, NULL, NULL);
+    SDL_RenderPresent(ren);
+    SDL_Delay(3000);
+    SDL_Quit();
+}