// Fills a polygon using a texture, gouraud shading and a normal map given 3 points and a color.
void Rasterizer::FillPolygonTexturedNormalMapped(Vertex v1, Vertex v2, Vertex v3, Gdiplus::Color color, Model3D& model, std::vector<DirectionalLight*> directionalLights, std::vector<AmbientLight*> ambientLights, std::vector<PointLight*> pointLights)
{
ScanLine* _scanlines = new ScanLine[_height];
BYTE* texture;
Gdiplus::Color* palette;
BYTE* normalTexture;
Gdiplus::Color* normalPalette;
int textureWidth;
// Get the texture properties of the model.
model.GetTexture(&texture, &palette, &textureWidth);
model.GetNormalMapTexture(&normalTexture, &normalPalette, &textureWidth);
// Set the scanlines to very high and very low values so
// they will be set on the first set of interpolation.
for (unsigned int i = 0; i < _height; i++)
{
_scanlines[i].xStart = 99999;
_scanlines[i].xEnd = -99999;
}
// Interpolates between each of the vertexs of the polygon and sets the start
// and end values for each of the scanlines it comes in contact with.
InterpolateScanline(_scanlines, v1, v2);
InterpolateScanline(_scanlines, v2, v3);
InterpolateScanline(_scanlines, v3, v1);
// Go through each scanline and each pixel in the scanline and
// sets its color.
for (unsigned int y = 0; y < _height; y++)
{
// Work out the color and UV differences between the start and end of the scanline.
float redColorDiff = (_scanlines[y].redEnd - _scanlines[y].redStart);
float greenColorDiff = (_scanlines[y].greenEnd - _scanlines[y].greenStart);
float blueColorDiff = (_scanlines[y].blueEnd - _scanlines[y].blueStart);
float uCoordDiff = _scanlines[y].uEnd - _scanlines[y].uStart;
float vCoordDiff = _scanlines[y].vEnd - _scanlines[y].vStart;
float zCoordDiff = _scanlines[y].zEnd - _scanlines[y].zStart;
float xNormalDiff = (_scanlines[y].xNormalEnd - _scanlines[y].xNormalStart);
float yNormalDiff = (_scanlines[y].yNormalEnd - _scanlines[y].yNormalStart);
float zNormalDiff = (_scanlines[y].zNormalEnd - _scanlines[y].zNormalStart);
float xDiff = (_scanlines[y].pixelXEnd - _scanlines[y].pixelXStart);
float yDiff = (_scanlines[y].pixelYEnd - _scanlines[y].pixelYStart);
float zDiff = (_scanlines[y].pixelZEnd - _scanlines[y].pixelZStart);
float diff = (_scanlines[y].xEnd - _scanlines[y].xStart) + 1;
for (int x = (int)_scanlines[y].xStart; x <= (int)_scanlines[y].xEnd; x++)
{
if (x < 0 || x >= (int)_width)
continue;
int offset = (int)(x - _scanlines[y].xStart);
// Work out the UV coordinate of the current pixel.
float uCoord = _scanlines[y].uStart + ((uCoordDiff / diff) * offset);
float vCoord = _scanlines[y].vStart + ((vCoordDiff / diff) * offset);
float zCoord = _scanlines[y].zStart + ((zCoordDiff / diff) * offset);
uCoord /= zCoord;
vCoord /= zCoord;
// Work out the normal of the pixel.
float xNormal = _scanlines[y].xNormalStart + ((xNormalDiff / diff) * offset);
float yNormal = _scanlines[y].yNormalStart + ((yNormalDiff / diff) * offset);
float zNormal = _scanlines[y].zNormalStart + ((zNormalDiff / diff) * offset);
// Work out the position of the pixel.
float pixelX = _scanlines[y].pixelXStart + ((xDiff / diff) * offset);
float pixelY = _scanlines[y].pixelYStart + ((yDiff / diff) * offset);
float pixelZ = _scanlines[y].pixelZStart + ((zDiff / diff) * offset);
// Work out the lighting colour of the current pixel.
//float lightR = (_scanlines[y].redStart + ((redColorDiff / diff) * offset)) / 180.0f;
//float lightG = (_scanlines[y].greenStart + ((greenColorDiff / diff) * offset)) / 180.0f;
//float lightB = (_scanlines[y].blueStart + ((blueColorDiff / diff) * offset)) / 180.0f;
// Using the UV coordinate work out which pixel in the texture to use to draw this pixel.
int pixelIndex = (int)vCoord * textureWidth + (int)uCoord;
if (pixelIndex >= textureWidth * textureWidth || pixelIndex < 0)
{
pixelIndex = (textureWidth * textureWidth) - 1;
}
int paletteOffset = texture[pixelIndex];
if (paletteOffset >= 255)
paletteOffset = 255;
Gdiplus::Color textureColor = palette[paletteOffset];
// Work out the pixel colour of the normalmap.
pixelIndex = (int)vCoord * textureWidth + (int)uCoord;
if (pixelIndex >= textureWidth * textureWidth || pixelIndex < 0)
{
pixelIndex = (textureWidth * textureWidth) - 1;
}
paletteOffset = normalTexture[pixelIndex];
if (paletteOffset >= 255)
paletteOffset = 255;
Gdiplus::Color normalTextureColor = normalPalette[paletteOffset];
// Calculate normal lighting for the pixel.
Vector3D heightMapVector = Vector3D(normalTextureColor.GetR() / 180.0f, normalTextureColor.GetG() / 180.0f, normalTextureColor.GetB() / 180.0f);
heightMapVector = Vector3D((heightMapVector.GetX() - 0.5f) * 2.0f, (heightMapVector.GetY() - 0.5f) * 2.0f, (heightMapVector.GetZ() - 0.5f) * 2.0f);
// Work out he pixels normal and position.
Vector3D pixelNormal = Vector3D(xNormal, yNormal, zNormal);//;Vector3D(heightMapVector.GetX(), heightMapVector.GetY(), heightMapVector.GetZ());
Vertex pixelPosition = Vertex(pixelX, pixelY, pixelZ, 1, Gdiplus::Color::White, Vector3D(0, 0, 0), 0);
heightMapVector = Vector3D((pixelNormal.GetX() * heightMapVector.GetX()) ,
(pixelNormal.GetY() * heightMapVector.GetY()) ,
(pixelNormal.GetZ() * heightMapVector.GetZ()) );
// Calculate the sum dot product of all lighting vectors for this pixel and divide by the number
// of lights.
float lightDot = 0.0f;
int count = 0;
for (unsigned int j = 0; j < pointLights.size(); j++)
{
PointLight* light = pointLights[j];
if (light->GetEnabled() == false)
continue;
// Work out vector to light source.
Vector3D lightVector = Vertex::GetVector(pixelPosition, light->GetPosition());
float distance = lightVector.GetLength();
lightVector.Normalize();
// Work out dot product.
lightDot += Vector3D::DotProduct(heightMapVector, lightVector);
count++;
}
for (unsigned int j = 0; j < directionalLights.size(); j++)
{
DirectionalLight* light = directionalLights[j];
if (light->GetEnabled() == false)
continue;
// Work out vector to light source.
Vector3D lightVector = Vertex::GetVector(pixelPosition, light->GetPosition());
float distance = lightVector.GetLength();
lightVector.Normalize();
// Work out dot product.
lightDot += Vector3D::DotProduct(heightMapVector, lightVector);
count++;
}
lightDot /= count;
// Adjust texture colour based on the lighting dot product.
Gdiplus::Color pixelColor = textureColor;
//pixelColor = model.CalculateLightingAmbientPerPixel(ambientLights, pixelPosition, pixelNormal, pixelColor);
//pixelColor = model.CalculateLightingDirectionalPerPixel(directionalLights, pixelPosition, pixelNormal, pixelColor);
//pixelColor = model.CalculateLightingPointPerPixel(pointLights, pixelPosition, pixelNormal, pixelColor);
float lightR = (_scanlines[y].redStart + ((redColorDiff / diff) * offset)) / 180.0f;
float lightG = (_scanlines[y].greenStart + ((greenColorDiff / diff) * offset)) / 180.0f;
float lightB = (_scanlines[y].blueStart + ((blueColorDiff / diff) * offset)) / 180.0f;
// Apply the lighting value to the texture colour and use the result to set the colour of the current pixel.
int finalR = (int)max(0, min(255, (lightR * textureColor.GetR()) - ((lightR * textureColor.GetR()) * lightDot) ));
int finalG = (int)max(0, min(255, (lightG * textureColor.GetG()) - ((lightG * textureColor.GetG()) * lightDot) ));
int finalB = (int)max(0, min(255, (lightB * textureColor.GetB()) - ((lightB * textureColor.GetB()) * lightDot) ));
WritePixel(x, y, Gdiplus::Color(finalR, finalG, finalB));
}
}
// Dispose of dynamic objects.
delete[] _scanlines;
_polygonsRendered++;
}
// Fills a polygon using a texture and gouraud shading given 3 points and a color.
void Rasterizer::FillPolygonTextured(Vertex v1, Vertex v2, Vertex v3, Gdiplus::Color color, Model3D& model)
{
ScanLine* _scanlines = new ScanLine[_height];
BYTE* texture;
Gdiplus::Color* palette;
int textureWidth;
// Get the texture properties of the model.
model.GetTexture(&texture, &palette, &textureWidth);
// Set the scanlines to very high and very low values so
// they will be set on the first set of interpolation.
for (unsigned int i = 0; i < _height; i++)
{
_scanlines[i].xStart = 99999;
_scanlines[i].xEnd = -99999;
}
// Interpolates between each of the vertexs of the polygon and sets the start
// and end values for each of the scanlines it comes in contact with.
InterpolateScanline(_scanlines, v1, v2);
InterpolateScanline(_scanlines, v2, v3);
InterpolateScanline(_scanlines, v3, v1);
// Go through each scanline and each pixel in the scanline and
// sets its color.
for (unsigned int y = 0; y < _height; y++)
{
// Work out the color and UV differences between the start and end of the scanline.
float redColorDiff = (_scanlines[y].redEnd - _scanlines[y].redStart);
float greenColorDiff = (_scanlines[y].greenEnd - _scanlines[y].greenStart);
float blueColorDiff = (_scanlines[y].blueEnd - _scanlines[y].blueStart);
float uCoordDiff = _scanlines[y].uEnd - _scanlines[y].uStart;
float vCoordDiff = _scanlines[y].vEnd - _scanlines[y].vStart;
float zCoordDiff = _scanlines[y].zEnd - _scanlines[y].zStart;
float diff = (_scanlines[y].xEnd - _scanlines[y].xStart) + 1;
for (int x = (int)_scanlines[y].xStart; x <= (int)_scanlines[y].xEnd; x++)
{
if (x < 0 || x >= (int)_width)
continue;
int offset = (int)(x - _scanlines[y].xStart);
// Work out the UV coordinate of the current pixel.
float uCoord = _scanlines[y].uStart + ((uCoordDiff / diff) * offset);
float vCoord = _scanlines[y].vStart + ((vCoordDiff / diff) * offset);
float zCoord = _scanlines[y].zStart + ((zCoordDiff / diff) * offset);
uCoord /= zCoord;
vCoord /= zCoord;
// Work out the lighting colour of the current pixel.
float lightR = (_scanlines[y].redStart + ((redColorDiff / diff) * offset)) / 180.0f;
float lightG = (_scanlines[y].greenStart + ((greenColorDiff / diff) * offset)) / 180.0f;
float lightB = (_scanlines[y].blueStart + ((blueColorDiff / diff) * offset)) / 180.0f;
// Using the UV coordinate work out which pixel in the texture to use to draw this pixel.
int pixelIndex = (int)vCoord * textureWidth + (int)uCoord;
if (pixelIndex >= textureWidth * textureWidth || pixelIndex < 0)
{
pixelIndex = (textureWidth * textureWidth) - 1;
}
int paletteOffset = texture[pixelIndex];
if (paletteOffset >= 255)
paletteOffset = 255;
Gdiplus::Color textureColor = palette[paletteOffset];
// Apply the lighting value to the texture colour and use the result to set the colour of the current pixel.
int finalR = (int)max(0, min(255, textureColor.GetR() * lightR));
int finalG = (int)max(0, min(255, textureColor.GetG() * lightG));
int finalB = (int)max(0, min(255, textureColor.GetB() * lightB));
WritePixel(x, y, Gdiplus::Color(finalR, finalG, finalB));
}
}
// Dispose of dynamic objects.
delete[] _scanlines;
_polygonsRendered++;
}
