mv sdl2 demo to src/ppusim folder

3 files changed, 54 insertions, 0 deletions

diff --git a/src/ds.mk b/src/ds.mk
index 57b305f..498ed27 100644
--- a/src/ds.mk
+++ b/src/ds.mk
@@ -1,2 +1,7 @@
 CC := gcc
 LD := gcc
+
+LFLAGS += -lSDL2
+
+DESKTOP_SRCS += ppusim/main.c
+
diff --git a/src/makefile b/src/makefile
index 6077824..f433385 100644
--- a/src/makefile
+++ b/src/makefile
@@ -33,6 +33,7 @@ AFLAGS += $(SHARED_FLAGS)
 
 SRCS += $(LOCAL_SRCS)
 SRCS += $(if $(STM), $(STM_SRCS), )
+SRCS += $(if $(DESKTOP), $(DESKTOP_SRCS), )
 
 ifeq ($(PLATFORM),stm)
 OBJS := $(patsubst %.c,%-stm.o, $(patsubst %.s,%-stm.o, $(SRCS)))
diff --git a/src/ppusim/sim.c b/src/ppusim/sim.c
new file mode 100644
index 0000000..beddc3f
--- /dev/null
+++ b/src/ppusim/sim.c
@@ -0,0 +1,48 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <math.h>
+#include <SDL2/SDL.h>
+
+#define UPSCALE_FACTOR 3
+#define WIN_HEIGHT 240
+#define WIN_WIDTH 320
+#define FPS 60
+
+static void pixel(SDL_Renderer* r, unsigned px, unsigned py, unsigned cr, unsigned cg, unsigned cb) {
+		SDL_SetRenderDrawColor(r, cr, cg, cb, 255);
+		SDL_RenderFillRect(r, &(SDL_Rect) {.x = px * UPSCALE_FACTOR, .y = py * UPSCALE_FACTOR, .w = UPSCALE_FACTOR, .h = UPSCALE_FACTOR});
+}
+
+int main() {
+	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
+	SDL_Window *window = SDL_CreateWindow("sdl2 test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIN_WIDTH * UPSCALE_FACTOR, WIN_HEIGHT * UPSCALE_FACTOR, SDL_WINDOW_SHOWN);
+	SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+
+	SDL_Event e;
+	unsigned long frame = 0;
+	while (true) {
+		uint32_t start = SDL_GetTicks();
+		frame++;
+		while (SDL_PollEvent(&e)) if (e.type == SDL_QUIT) exit(0);
+		
+		SDL_RenderClear(renderer);
+
+		for (unsigned i = 0; i < WIN_WIDTH; i++) {
+			for (unsigned j = 0; j < WIN_HEIGHT; j++) {
+				pixel(renderer, i, j, (unsigned)(sqrt(i * 20) + frame) % 255, (i * j + frame) % 255, (j * 20) % 255);
+			}
+		}
+
+		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+		SDL_RenderPresent(renderer);
+
+		uint32_t end = SDL_GetTicks();
+		int wait_for = 1000 / FPS - (end - start);
+		if (wait_for > 0) SDL_Delay(wait_for);
+	}
+
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+	return 0;
+}