Render byte buffers from the application

assets.h

@@ -0,0 +1,12 @@
+#ifndef SHROOMS_VB_NATIVE_ASSETS_
+#define SHROOMS_VB_NATIVE_ASSETS_
+
+#include <stdint.h>
+
+extern const uint8_t asset_lefteye_start;
+const uint8_t *LEFT_EYE_DEFAULT = &asset_lefteye_start; 
+
+extern const uint8_t asset_righteye_start;
+const uint8_t *RIGHT_EYE_DEFAULT = &asset_righteye_start; 
+
+#endif

assets/assets.s

@@ -0,0 +1,15 @@
+.section .note.GNU-stack,"",@progbits
+.section .bindata, "a", @progbits
+
+.global asset_lefteye_start
+.type asset_lefteye_start, @object
+.global asset_righteye_start
+.type asset_righteye_start, @object
+
+.section .bindata
+.balign 64
+asset_lefteye_start:
+    .incbin "assets/lefteye.bin"
+.balign 64
+asset_righteye_start:
+    .incbin "assets/righteye.bin"

game.c

@@ -1,3 +1,4 @@
+#include <assets.h>
 #include <game.h>
 #include <SDL2/SDL.h>
 #include <time.h>
@@ -11,13 +12,17 @@ int sleepNanos(long int ns) {
 
 #define MAX_STEP_CLOCKS 20000
 
-int runGame(VB *sim) {
+int runGame(VB *sim, GraphicsContext *gfx) {
     uint32_t clocks;
     SDL_Event event;
 
+    gfxUpdateLeftEye(gfx, LEFT_EYE_DEFAULT);
+    gfxUpdateRightEye(gfx, RIGHT_EYE_DEFAULT);
+
     while (1) {
         clocks = MAX_STEP_CLOCKS;
         vbEmulate(sim, &clocks);
+        gfxRender(gfx);
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_QUIT) {
                 return 0;

game.h

@@ -1,8 +1,9 @@
 #ifndef SHROOMS_VB_NATIVE_GAME_
 #define SHROOMS_VB_NATIVE_GAME_
 
+#include "graphics.h"
 #include "shrooms-vb-core/core/vb.h"
 
-int runGame(VB *sim);
+int runGame(VB *sim, GraphicsContext *gfx);
 
 #endif

graphics.c

@@ -0,0 +1,92 @@
+#include <graphics.h>
+
+static void copyScreenTexture(uint8_t *dst, const uint8_t *src, int pitch) {
+    int x, y, i;
+    uint8_t color;
+    int delta = pitch / 384;
+    for (y = 0; y < 224; ++y) {
+        for (x = 0; x < 384; x += 1) {
+            color = src[(y * 384) + x];
+            for (i = 0; i < delta; ++i) {
+                dst[(y * pitch) + (x * delta) + i] = color;
+            }
+        }
+    }
+}
+
+int gfxInit(GraphicsContext *gfx) {
+    gfx->window = SDL_CreateWindow("Shrooms VB",
+        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+        1536, 896, SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
+    if (!gfx->window) {
+        fprintf(stderr, "Error creating window: %s\n", SDL_GetError());
+        return 1;
+    }
+
+    gfx->winSurface = SDL_GetWindowSurface(gfx->window);
+    if (!gfx->winSurface) {
+        fprintf(stderr, "Error getting surface: %s\n", SDL_GetError());
+        goto cleanup_window;
+    }
+
+    gfx->renderer = SDL_GetRenderer(gfx->window);
+    if (!gfx->renderer) {
+        fprintf(stderr, "Error getting renderer: %s\n", SDL_GetError());
+        goto cleanup_window;
+    }
+
+    gfx->leftEye = SDL_CreateTexture(gfx->renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_STREAMING, 384, 224);
+    if (!gfx->leftEye) {
+        fprintf(stderr, "Error creating left eye texture: %s\n", SDL_GetError());
+        goto cleanup_window;
+    }
+    SDL_SetTextureColorMod(gfx->leftEye, 255, 0, 0);
+
+    gfx->rightEye = SDL_CreateTexture(gfx->renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_STREAMING, 384, 224);
+    if (!gfx->rightEye) {
+        fprintf(stderr, "Error creating left eye texture: %s\n", SDL_GetError());
+        goto cleanup_left_eye;
+    }
+    SDL_SetTextureColorMod(gfx->rightEye, 0, 0, 255);
+    SDL_SetTextureBlendMode(gfx->rightEye, SDL_BLENDMODE_ADD);
+
+    return 0;
+
+cleanup_left_eye:
+    SDL_DestroyTexture(gfx->leftEye);
+cleanup_window:
+    SDL_DestroyWindow(gfx->window);
+    return 1;
+}
+
+void gfxDestroy(GraphicsContext *gfx) {
+    SDL_DestroyTexture(gfx->rightEye);
+    SDL_DestroyTexture(gfx->leftEye);
+    SDL_DestroyWindow(gfx->window);
+}
+
+static void gfxUpdateEye(SDL_Texture *eye, const uint8_t *bytes) {
+    void *target;
+    int pitch;
+    if (SDL_LockTexture(eye, NULL, &target, &pitch)) {
+        fprintf(stderr, "Error locking buffer for eye: %s\n", SDL_GetError());
+        return;
+    }
+    copyScreenTexture(target, bytes, pitch);
+    SDL_UnlockTexture(eye);
+}
+
+void gfxUpdateLeftEye(GraphicsContext *gfx, const uint8_t *bytes) {
+    gfxUpdateEye(gfx->leftEye, bytes);
+}
+void gfxUpdateRightEye(GraphicsContext *gfx, const uint8_t *bytes) {
+    gfxUpdateEye(gfx->rightEye, bytes);
+}
+
+void gfxRender(GraphicsContext *gfx) {
+    SDL_RenderClear(gfx->renderer);
+    SDL_RenderCopy(gfx->renderer, gfx->leftEye, NULL, NULL);
+    SDL_RenderCopy(gfx->renderer, gfx->rightEye, NULL, NULL);
+    SDL_RenderPresent(gfx->renderer);
+}
+

graphics.h

@@ -0,0 +1,22 @@
+#ifndef SHROOMS_VB_NATIVE_GRAPHICS_
+#define SHROOMS_VB_NATIVE_GRAPHICS_
+
+#include <SDL2/SDL.h>
+
+typedef struct {
+    SDL_Window *window;
+    SDL_Surface *winSurface;
+    SDL_Renderer *renderer;
+    SDL_Texture *leftEye;
+    SDL_Texture *rightEye;
+} GraphicsContext;
+
+int gfxInit(GraphicsContext *gfx);
+void gfxDestroy(GraphicsContext *gfx);
+
+void gfxUpdateLeftEye(GraphicsContext *gfx, const uint8_t *bytes);
+void gfxUpdateRightEye(GraphicsContext *gfx, const uint8_t *bytes);
+
+void gfxRender(GraphicsContext *gfx);
+
+#endif

main.c

@@ -1,5 +1,6 @@
 #include <cli.h>
 #include <game.h>
+#include <graphics.h>
 #include <SDL2/SDL.h>
 #include "shrooms-vb-core/core/vb.h"
 #include <stdio.h>
@@ -51,8 +52,7 @@ int main(int argc, char **argv) {
     VB *sim;
     uint8_t *rom;
     uint32_t romSize;
-    SDL_Surface *winSurface;
-    SDL_Window *window;
+    GraphicsContext gfx;
     CLIArgs args;
     int status;
 
@@ -74,27 +74,12 @@ int main(int argc, char **argv) {
         return 1;
     }
 
-    window = SDL_CreateWindow("Shrooms VB",
-        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-        384, 224, SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
-    if (!window) {
-        fprintf(stderr, "Error creating window: %s\n", SDL_GetError());
+    if (gfxInit(&gfx)) {
+        SDL_Quit();
         return 1;
     }
 
-    winSurface = SDL_GetWindowSurface(window);
-    if (!winSurface) {
-        fprintf(stderr, "Error getting surface: %s\n", SDL_GetError());
-        return 1;
-    }
-
-    SDL_FillRect(winSurface, NULL, SDL_MapRGB(winSurface->format, 255, 0, 0));
-    SDL_UpdateWindowSurface(window);
-
-    status = runGame(sim);
-
-    SDL_DestroyWindow(window);
+    status = runGame(sim, &gfx);
     SDL_Quit();
-
     return status;
 }

makefile

@@ -11,7 +11,7 @@ else
 endif
 
 build:
-	@$(CC) cli.c game.c main.c -I . \
+	@$(CC) cli.c game.c graphics.c main.c assets/assets.s -I . \
 		$(SHROOMSFLAGS) $(SDL2FLAGS) \
 		-D POSIX_C_SOURCE=199309L \
 		-o shrooms-vb \