82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
#include "DisplaySDL.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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// 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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Display::clear();
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SDL_FillRect(SDL_GetWindowSurface(mpWindow), nullptr, mBgColor);
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SDL_UpdateWindowSurface(mpWindow);
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miTopDirtyScanline = chocochip8::gcHeight - 1;
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miBottomDirtyScanline = 0;
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}
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void DisplaySDL::updateWindow() const {
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if(miTopDirtyScanline > miBottomDirtyScanline) {
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// No changes since the last update
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return;
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}
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SDL_Surface *pSurface = SDL_GetWindowSurface(mpWindow);
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for(int y = 0; y < chocochip8::gcHeight; y++) {
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if(y < miTopDirtyScanline || miBottomDirtyScanline < y) {
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// Skip scanlines that haven't changed since the last update
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continue;
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}
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for(int x = 0; x < chocochip8::gcWidth; x++) {
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// Map framebuffer pixel to SDL surface rectangle
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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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SDL_Rect rect;
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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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// Read Chocochip8 Framebuffer and choose appropriate color,
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// note that the MSB of an scanline's bitset is the leftmost pixel.
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Uint32 color = (mpFramebuffer->at(y)[(chocochip8::gcWidth - 1) - x] ? mFgColor : mBgColor);
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SDL_FillRect(pSurface, &rect, color);
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}
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}
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miTopDirtyScanline = chocochip8::gcHeight - 1;
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miBottomDirtyScanline = 0;
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SDL_UpdateWindowSurface(mpWindow);
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}
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