85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
#include "DisplaySDL.hpp"
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#include "Peripherals.hpp"
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#include <stdexcept>
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DisplaySDL::DisplaySDL(int w, int h, uint32_t fgColor, uint32_t bgColor):
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mpFramebuffer{std::make_unique<Framebuffer>()} {
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// Create SDL Window
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mpWindow = SDL_CreateWindow(
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"ChocoChip-8",
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SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
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w, h,
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0
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);
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if(mpWindow == NULL) {
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throw std::runtime_error(SDL_GetError());
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}
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// Convert our foreground/background colors to the format expected by SDL
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SDL_PixelFormat *fmt = SDL_AllocFormat(SDL_GetWindowPixelFormat(mpWindow));
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mFgColor = SDL_MapRGB(
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fmt,
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(fgColor & 0x00FF0000) >> 16,
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(fgColor & 0x0000FF00) >> 8,
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(fgColor & 0x000000FF)
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);
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mBgColor = SDL_MapRGB(
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fmt,
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(bgColor & 0x00FF0000) >> 16,
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(bgColor & 0x0000FF00) >> 8,
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(bgColor & 0x000000FF)
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);
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SDL_FreeFormat(fmt);
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};
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DisplaySDL::~DisplaySDL() {
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SDL_DestroyWindow(mpWindow);
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}
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void DisplaySDL::clear() {
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for(auto &scanline : *mpFramebuffer) {
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scanline.reset();
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}
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SDL_FillRect(SDL_GetWindowSurface(mpWindow), nullptr, mBgColor);
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}
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int DisplaySDL::blit(const chocochip8::Scanline &spriteScanline, int y) {
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using chocochip8::Scanline;
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Scanline &targetScanline = mpFramebuffer->at(y);
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Scanline bitsToSet = spriteScanline & ~targetScanline;
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Scanline bitsToReset = spriteScanline & targetScanline;
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targetScanline ^= spriteScanline;
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SDL_Surface *pSurface = SDL_GetWindowSurface(mpWindow);
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SDL_Rect rect;
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// Map framebuffer pixel to SDL surface rectangle
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auto mapChipxelToPixel = [&rect, pSurface](int x, int y) {
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// Note that the MSB of an scanline's bitset is the leftmost pixel.
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x = (chocochip8::gcWidth - 1) - x;
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int x1 = ( x * pSurface->w) / chocochip8::gcWidth;
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int x2 = ((x + 1) * pSurface->w) / chocochip8::gcWidth;
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int y1 = ( y * pSurface->h) / chocochip8::gcHeight;
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int y2 = ((y + 1) * pSurface->h) / chocochip8::gcHeight;
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rect.x = x1;
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rect.y = y1;
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rect.w = x2 - x1;
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rect.h = y2 - y1;
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};
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for(int x = bitsToReset._Find_first(); x < bitsToReset.size(); x = bitsToReset._Find_next(x)) {
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mapChipxelToPixel(x, y);
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SDL_FillRect(pSurface, &rect, mBgColor);
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}
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for(int x = bitsToSet._Find_first(); x < bitsToSet.size(); x = bitsToSet._Find_next(x)) {
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mapChipxelToPixel(x, y);
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SDL_FillRect(pSurface, &rect, mFgColor);
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}
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return bitsToReset.any();
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}
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void DisplaySDL::updateWindow() const {
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SDL_UpdateWindowSurface(mpWindow);
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}
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