From 97dd5f6bd354c8e931778c79c7a421d5bdaafee5 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Fri, 24 Feb 2023 19:23:56 +0100
Subject: WIP ppusim

---
 src/ppusim/pixel.c | 22 ++++++++++++++++++++++
 src/ppusim/pixel.h |  6 ++++++
 src/ppusim/sim.c   | 22 +++++-----------------
 3 files changed, 33 insertions(+), 17 deletions(-)
 create mode 100644 src/ppusim/pixel.c
 create mode 100644 src/ppusim/pixel.h

(limited to 'src/ppusim')

diff --git a/src/ppusim/pixel.c b/src/ppusim/pixel.c
new file mode 100644
index 0000000..3a09ccd
--- /dev/null
+++ b/src/ppusim/pixel.c
@@ -0,0 +1,22 @@
+#include <SDL2/SDL.h>
+
+#include "ppusim/sim.h"
+
+static void hh_ppusim_draw(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 * HH_PPUSIM_UPSCALE_FACTOR,
+		.y = py * HH_PPUSIM_UPSCALE_FACTOR,
+		.w = HH_PPUSIM_UPSCALE_FACTOR,
+		.h = HH_PPUSIM_UPSCALE_FACTOR
+	});
+}
+
+void hh_ppusim_pixel(SDL_Renderer* r, unsigned x, unsigned y) {
+	// loop through foreground sprites to get highest priority cidx
+	// get background cidx
+	// check if palette color cidx of foreground is 0
+	// lookup color from PAL
+	// hh_ppusim_draw
+}
+
diff --git a/src/ppusim/pixel.h b/src/ppusim/pixel.h
new file mode 100644
index 0000000..8044560
--- /dev/null
+++ b/src/ppusim/pixel.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <SDL2/SDL.h>
+
+void hh_ppusim_pixel(SDL_Renderer*, unsigned x, unsigned y);
+
diff --git a/src/ppusim/sim.c b/src/ppusim/sim.c
index a3314e4..8f01359 100644
--- a/src/ppusim/sim.c
+++ b/src/ppusim/sim.c
@@ -7,26 +7,18 @@
 #include "ppu/ppu.h"
 #include "ppusim/mem.h"
 #include "ppusim/sim.h"
+#include "ppusim/pixel.h"
 
 SDL_Window *g_hh_window = NULL;
 SDL_Renderer *g_hh_renderer = NULL;
 
-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 * HH_PPUSIM_UPSCALE_FACTOR,
-		.y = py * HH_PPUSIM_UPSCALE_FACTOR,
-		.w = HH_PPUSIM_UPSCALE_FACTOR,
-		.h = HH_PPUSIM_UPSCALE_FACTOR
-	});
-}
-
 void hh_ppu_init() {
 	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
 	g_hh_window = SDL_CreateWindow("ppusim", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, HH_PPU_SCREEN_WIDTH * HH_PPUSIM_UPSCALE_FACTOR, HH_PPU_SCREEN_HEIGHT * HH_PPUSIM_UPSCALE_FACTOR, SDL_WINDOW_SHOWN);
 	g_hh_renderer = SDL_CreateRenderer(g_hh_window, -1, SDL_RENDERER_ACCELERATED);
 
 	g_hh_ppusim_vram = malloc(sizeof(hh_ppu_data_t) * 0xffff);
+	memset(g_hh_ppusim_vram, 0x0000, 0xffff);
 }
 
 void hh_ppu_deinit() {
@@ -38,22 +30,18 @@ void hh_ppu_deinit() {
 }
 
 void hh_loop() {
-	static unsigned long frame = 0;
 	SDL_Event e;
 	while (g_hh_run) {
 		uint32_t start = SDL_GetTicks();
-		frame++;
 		while (SDL_PollEvent(&e)) if (e.type == SDL_QUIT) exit(0);
 		
 		hh_ppu_vblank_interrupt();
 
 		SDL_RenderClear(g_hh_renderer);
 
-		for (unsigned i = 0; i < HH_PPU_SCREEN_WIDTH; i++) {
-			for (unsigned j = 0; j < HH_PPU_SCREEN_HEIGHT; j++) {
-				pixel(g_hh_renderer, i, j, (unsigned)(sqrt(i * 20) + frame) % 255, (i * j + frame) % 255, (j * 20) % 255);
-			}
-		}
+		for (unsigned x = 0; x < HH_PPU_SCREEN_WIDTH; x++)
+			for (unsigned y = 0; y < HH_PPU_SCREEN_HEIGHT; y++)
+				hh_ppusim_pixel(g_hh_renderer, x, y);
 
 		SDL_SetRenderDrawColor(g_hh_renderer, 0, 0, 0, 255);
 		SDL_RenderPresent(g_hh_renderer);
-- 
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