98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "EmulationSettings.h"
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#include "PPU.h"
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class DrawCommand
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{
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private:
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int _frameCount;
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uint32_t* _argbBuffer;
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OverscanDimensions _overscan;
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uint32_t _lineWidth;
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uint32_t _startFrame;
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protected:
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bool _useIntegerScaling;
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float _xScale;
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int _yScale;
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virtual void InternalDraw() = 0;
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__forceinline void DrawPixel(uint32_t x, uint32_t y, int color)
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{
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if(x < _overscan.Left || x >= _overscan.Left + _overscan.GetScreenWidth() ||
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y < _overscan.Top || y >= _overscan.Top + _overscan.GetScreenHeight()) {
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//In overscan (out of bounds), skip drawing
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return;
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}
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uint32_t alpha = (color & 0xFF000000);
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if(alpha > 0) {
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if(_yScale == 1) {
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if(alpha != 0xFF000000) {
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BlendColors((uint8_t*)&_argbBuffer[(y - _overscan.Top)*_lineWidth + (x - _overscan.Left)], (uint8_t*)&color);
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} else {
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_argbBuffer[(y - _overscan.Top)*_lineWidth + (x - _overscan.Left)] = color;
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}
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} else {
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int xPixelCount = _useIntegerScaling ? _yScale : (int)((x + 1)*_xScale) - (int)(x*_xScale);
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x = (int)(x * (_useIntegerScaling ? _yScale : _xScale));
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y = (int)(y * _yScale);
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int top = (int)(_overscan.Top * _yScale);
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int left = (int)(_overscan.Left * _xScale);
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for(int i = 0; i < _yScale; i++) {
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for(int j = 0; j < xPixelCount; j++) {
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if(alpha != 0xFF000000) {
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BlendColors((uint8_t*)&_argbBuffer[(y - top)*_lineWidth + i*_lineWidth + (x - left)+j], (uint8_t*)&color);
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} else {
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_argbBuffer[(y - top)*_lineWidth + i*_lineWidth + (x - left) +j] = color;
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}
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}
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}
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}
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}
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}
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__forceinline void BlendColors(uint8_t output[4], uint8_t input[4])
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{
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uint8_t alpha = input[3] + 1;
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uint8_t invertedAlpha = 256 - input[3];
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output[0] = (uint8_t)((alpha * input[0] + invertedAlpha * output[0]) >> 8);
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output[1] = (uint8_t)((alpha * input[1] + invertedAlpha * output[1]) >> 8);
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output[2] = (uint8_t)((alpha * input[2] + invertedAlpha * output[2]) >> 8);
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output[3] = 0xFF;
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}
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public:
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DrawCommand(int frameCount, bool useIntegerScaling = false)
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{
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_frameCount = frameCount > 0 ? frameCount : 1;
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_startFrame = PPU::GetFrameCount();
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_useIntegerScaling = useIntegerScaling;
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}
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virtual ~DrawCommand()
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{
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}
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void Draw(uint32_t* argbBuffer, OverscanDimensions &overscan, uint32_t lineWidth, uint32_t frameNumber)
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{
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if(_startFrame <= frameNumber) {
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_argbBuffer = argbBuffer;
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_overscan = overscan;
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_lineWidth = lineWidth;
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_yScale = lineWidth / overscan.GetScreenWidth();
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_xScale = (float)lineWidth / overscan.GetScreenWidth();
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InternalDraw();
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_frameCount--;
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}
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}
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bool Expired()
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{
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return _frameCount <= 0;
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}
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};
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