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feat: Enhance ROM Loading with Validation and Disassembly Viewer Integration

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- Added validation checks for ROM file existence and size constraints (minimum 32KB, maximum 8MB) during loading.
- Integrated a new disassembly viewer to track and display executed instructions, enhancing debugging capabilities.
- Updated CPU class to manage disassembly viewer instances, allowing for real-time instruction logging.
- Improved emulator's CMake configuration to include new source files related to the disassembly viewer.
- Enhanced pixel handling in the PPU to support BGRX format for better compatibility with SDL.
This commit is contained in:
scawful
2025-10-06 21:49:12 -04:00
parent 14eba4a765
commit 7f71fd9e80
9 changed files with 1262 additions and 483 deletions
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24
src/app/emu/video/ppu.cc
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@@ -207,18 +207,30 @@ void Ppu::HandlePixel(int x, int y) {
}
}
int row = (y - 1) + (even_frame ? 0 : 239);
// SDL_PIXELFORMAT_ARGB8888 with pixelOutputFormat=0 (BGRX)
// Memory layout: [B][G][R][A] at offsets 0,1,2,3 respectively
// Convert 5-bit SNES color (0-31) to 8-bit (0-255) via (val << 3) | (val >> 2)
// Two pixels per X position for hi-res support:
// pixel1 at x*8 + 0..3, pixel2 at x*8 + 4..7
// First pixel (hi-res/main screen)
pixelBuffer[row * 2048 + x * 8 + 0 + pixelOutputFormat] =
((b2 << 3) | (b2 >> 2)) * brightness / 15;
((b2 << 3) | (b2 >> 2)) * brightness / 15; // Blue channel
pixelBuffer[row * 2048 + x * 8 + 1 + pixelOutputFormat] =
((g2 << 3) | (g2 >> 2)) * brightness / 15;
((g2 << 3) | (g2 >> 2)) * brightness / 15; // Green channel
pixelBuffer[row * 2048 + x * 8 + 2 + pixelOutputFormat] =
((r2 << 3) | (r2 >> 2)) * brightness / 15;
((r2 << 3) | (r2 >> 2)) * brightness / 15; // Red channel
pixelBuffer[row * 2048 + x * 8 + 3 + pixelOutputFormat] = 0xFF; // Alpha (opaque)
// Second pixel (lo-res/subscreen)
pixelBuffer[row * 2048 + x * 8 + 4 + pixelOutputFormat] =
((b << 3) | (b >> 2)) * brightness / 15;
((b << 3) | (b >> 2)) * brightness / 15; // Blue channel
pixelBuffer[row * 2048 + x * 8 + 5 + pixelOutputFormat] =
((g << 3) | (g >> 2)) * brightness / 15;
((g << 3) | (g >> 2)) * brightness / 15; // Green channel
pixelBuffer[row * 2048 + x * 8 + 6 + pixelOutputFormat] =
((r << 3) | (r >> 2)) * brightness / 15;
((r << 3) | (r >> 2)) * brightness / 15; // Red channel
pixelBuffer[row * 2048 + x * 8 + 7 + pixelOutputFormat] = 0xFF; // Alpha (opaque)
}
int Ppu::GetPixel(int x, int y, bool subscreen, int* r, int* g, int* b) {

5
src/app/emu/video/ppu.h
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@@ -258,8 +258,9 @@ class Ppu {
// Initialize the frame buffer
void Init() {
frame_buffer_.resize(256 * 240, 0);
// Set to XBGR format (1) for compatibility with SDL_PIXELFORMAT_ARGB8888
pixelOutputFormat = 1;
// Set to BGRX format (0) for compatibility with SDL_PIXELFORMAT_ARGB8888
// Format 0 = BGRX: [B][G][R][A] byte order in memory (little-endian)
pixelOutputFormat = 0;
}
void Reset();