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https://git.coom.tech/drummyfish/raycastlib.git
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Fix ceiling
This commit is contained in:
Miloslav Číž
parent
6c35be3177
commit
8cf9617abf
1 changed files with 103 additions and 362 deletions
291
raycastlib.h
291
raycastlib.h
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@ -766,25 +766,22 @@ Unit adjustDistance(Unit distance, Camera *camera, Ray *ray)
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void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
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{
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// last written Y position, can never go backwards
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int_maybe32_t fPosY = _camera.resolution.y;
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int_maybe32_t cPosY = -1;
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#if 1
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// world coordinates
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Unit fZ1World = _startFloorHeight;
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Unit cZ1World = _startCeilHeight;
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// last written Y position, can never go backwards
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int_maybe32_t fPosY = _camera.resolution.y;
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int_maybe32_t cPosY = -1;
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PixelInfo p;
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p.position.x = x;
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// world coordinates
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Unit fZ1World = _startFloorHeight;
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Unit cZ1World = _startCeilHeight;
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int_maybe32_t i;
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PixelInfo p;
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p.position.x = x;
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int_maybe32_t i;
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// we'll be simulatenously drawing the floor and the ceiling now
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for (uint_maybe32_t j = 0; j <= hitCount; ++j)
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{ // ^ = add extra iteration for horizon plane
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// we'll be simulatenously drawing the floor and the ceiling now
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for (uint_maybe32_t j = 0; j <= hitCount; ++j)
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{ // ^ = add extra iteration for horizon plane
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int8_t drawingHorizon = j == hitCount;
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HitResult hit;
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@ -849,11 +846,14 @@ for (uint_maybe32_t j = 0; j <= hitCount; ++j)
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drawHorizontal(f,cPosY + 1,_camera.resolution.y,>,-)
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// ^ purposfully allow outside screen bounds here
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if (_ceilFunction != 0 || drawingHorizon)
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{
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// draw ceiling until wall
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p.isFloor = 0;
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p.depth = (cPosY - _cHorizontalDepthStart) * _horizontalDepthStep;
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drawHorizontal(c,-1,fPosY - 1,<,+)
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// ^ purposfully allow outside screen bounds here
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}
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#undef drawHorizontal
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#undef VERTICAL_DEPTH_MULTIPLY
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@ -893,7 +893,7 @@ for (uint_maybe32_t j = 0; j <= hitCount; ++j)
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// draw ceiling wall
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if (cPosY < _camResYLimit) // still pixels left?
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if (_ceilFunction != 0 && cPosY < _camResYLimit) // still pixels left?
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{
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p.isFloor = 0;
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drawVertical(c,-1,fPosY - 1,<,+)
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@ -901,266 +901,7 @@ for (uint_maybe32_t j = 0; j <= hitCount; ++j)
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#undef drawVertical
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}
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/*
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if (fPosY > 0) // still pixels left undrawn?
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{
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// draw floor wall
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p.isWall = 1;
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p.depth = dist;
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p.isFloor = 1;
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limit = clamp(fZ2Screen,0,_camera.resolution.y);
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// ^ allow outside screen at bottom
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for (i = fPosY - 1; i >= limit; --i)
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{
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p.position.y = i;
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p.hit = hit;
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_pixelFunction(&p);
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}
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if (limit < fPosY)
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fPosY = limit;
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fZ1World = fZ2World; // move to the next level for the next iteration
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}
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*/
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}
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#else
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int_maybe32_t y = _camResYLimit; // screen y (for floor), will only go up
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int_maybe32_t y2 = 0; // screen y (for ceil), will only fo down
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Unit worldZPrev = _startFloorHeight;
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Unit worldZPrevCeil = _startCeilHeight;
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PixelInfo p;
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p.position.x = x;
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#define VERTICAL_DEPTH_MULTIPLY 2
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// we'll be simulatenously drawing the floor and the ceiling now
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for (uint_maybe32_t j = 0; j < hitCount; ++j)
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{
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HitResult hit = hits[j];
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Unit dist = adjustDistance(hit.distance,&_camera,&ray);
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Unit wallHeight = _floorFunction(hit.square.x,hit.square.y);
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Unit worldZ2 = wallHeight - _camera.height;
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int_maybe32_t z1Screen = _middleRow - perspectiveScale(
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(worldZPrev * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
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int_maybe32_t z2Screen = _middleRow - perspectiveScale(
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(worldZ2 * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
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int8_t skipFloorWall = ((z1Screen < 0 && z2Screen < 0) ||
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(z1Screen > _camResYLimit && z2Screen > _camResYLimit));
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int_maybe32_t z1ScreenNoClamp = z1Screen;
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z1Screen = clamp(z1Screen,0,_camResYLimit);
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z1Screen = z1Screen > y2 ? z1Screen : y2;
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int_maybe32_t wallScreenHeightNoClamp = z1ScreenNoClamp - z2Screen + 1;
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wallScreenHeightNoClamp = wallScreenHeightNoClamp == 0 ? 1 :
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wallScreenHeightNoClamp;
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z2Screen = clamp(z2Screen,0,_camResYLimit);
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z2Screen = z2Screen > y2 ? z2Screen : y2;
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int_maybe32_t zTop = z1Screen < z2Screen ? z1Screen : z2Screen;
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// make the same variables for ceiling
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Unit wallHeightCeil = 0;
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Unit worldZ2Ceil = 0;
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int_maybe32_t z1ScreenCeil = 0;
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int_maybe32_t z1ScreenCeilNoClamp = 0;
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int_maybe32_t z2ScreenCeil = 0;
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int_maybe32_t wallScreenHeightCeilNoClamp = 0;
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int_maybe32_t zBottomCeil = y2;
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int8_t skipCeilingWall = 1;
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if (_ceilFunction != 0)
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{
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wallHeightCeil = _ceilFunction != 0 ?
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_ceilFunction(hit.square.x,hit.square.y) : 0;
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worldZ2Ceil = wallHeightCeil - _camera.height;
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z1ScreenCeil = _middleRow - perspectiveScale(
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(worldZPrevCeil * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
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z2ScreenCeil = _middleRow - perspectiveScale(
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(worldZ2Ceil * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
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skipCeilingWall = ((z1ScreenCeil < 0 && z2ScreenCeil < 0) ||
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(z1ScreenCeil > _camResYLimit && z2ScreenCeil > _camResYLimit));
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z1ScreenCeilNoClamp = z1ScreenCeil;
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z1ScreenCeil = clamp(z1ScreenCeil,0,_camResYLimit);
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z1ScreenCeil = z1ScreenCeil < y ? z1ScreenCeil : y;
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wallScreenHeightCeilNoClamp =
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z2ScreenCeil - z1ScreenCeilNoClamp;
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wallScreenHeightCeilNoClamp = wallScreenHeightCeilNoClamp != 0 ?
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wallScreenHeightCeilNoClamp : 1;
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z2ScreenCeil = clamp(z2ScreenCeil,0,_camResYLimit);
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z2ScreenCeil = z2ScreenCeil < y ? z2ScreenCeil : y;
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zBottomCeil = z1ScreenCeil > z2ScreenCeil ?
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z1ScreenCeil : z2ScreenCeil;
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}
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if (zTop <= zBottomCeil)
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zBottomCeil = zTop; // walls on ceiling and floor met
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// draw floor until wall
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p.isWall = 0;
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p.isFloor = 1;
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p.isHorizon = 0;
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Unit floorCameraDiff = absVal(worldZPrev) * VERTICAL_DEPTH_MULTIPLY;
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for (int_maybe32_t i = y; i > z1Screen; --i)
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{
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p.position.y = i;
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p.depth = (_fHorizontalDepthStart - i) * _horizontalDepthStep + floorCameraDiff;
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_pixelFunction(&p);
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}
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if (z1Screen < y)
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y = z1Screen;
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// draw ceiling until wall
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p.isFloor = 0;
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if (_ceilFunction != 0)
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{
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Unit ceilCameraDiff = absVal(worldZPrevCeil) * VERTICAL_DEPTH_MULTIPLY;
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for (int_maybe32_t i = y2; i < z1ScreenCeil; ++i)
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{
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p.position.y = i;
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p.depth = (i - _cHorizontalDepthStart) * _horizontalDepthStep + ceilCameraDiff;
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_pixelFunction(&p);
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}
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if (z1ScreenCeil > y2)
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y2 = z1ScreenCeil;
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}
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// draw floor wall
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p.isWall = 1;
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p.depth = dist;
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p.isFloor = 1;
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int_maybe32_t iTo;
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if (!skipFloorWall)
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{
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iTo = y2 < zTop ? zTop : y2;
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for (int_maybe32_t i = y; i >= iTo; --i)
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{
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p.position.y = i;
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p.hit = hit;
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if (_computeTextureCoords)
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p.textureCoordY = UNITS_PER_SQUARE - 1 - ((z1ScreenNoClamp - i) *
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UNITS_PER_SQUARE) / wallScreenHeightNoClamp;
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_pixelFunction(&p);
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}
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}
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// draw ceiling wall
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p.isFloor = 0;
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if (!skipCeilingWall)
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{
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iTo = y > zBottomCeil ? zBottomCeil : y;
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for (int_maybe32_t i = y2; i < iTo; ++i)
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{
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p.position.y = i;
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p.hit = hit;
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if (_computeTextureCoords)
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p.textureCoordY = ((i - z1ScreenCeilNoClamp) *
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UNITS_PER_SQUARE) / wallScreenHeightCeilNoClamp;
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_pixelFunction(&p);
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}
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}
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y = y > zTop ? zTop : y;
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worldZPrev = worldZ2;
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y2 = y2 < zBottomCeil ? zBottomCeil : y2;
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worldZPrevCeil = worldZ2Ceil;
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if (y <= y2)
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break; // walls on ceiling and floor met
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}
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// draw floor until horizon
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p.isWall = 0;
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p.isFloor = 1;
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p.isHorizon = 1;
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Unit floorCameraDiff = absVal(worldZPrev) * VERTICAL_DEPTH_MULTIPLY;
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Unit horizon = (y2 < _middleRow || _ceilFunction == 0) ? _middleRow : y2;
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horizon = clamp(horizon,0,_camera.resolution.y);
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horizon += horizon > y2 ? 0 : 1; // bug workaround
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for (int_maybe32_t i = y; i >= horizon; --i)
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{
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p.position.y = i;
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p.depth = (_fHorizontalDepthStart - i) * _horizontalDepthStep + floorCameraDiff;
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_pixelFunction(&p);
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}
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y = horizon < y ? horizon : y;
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// draw ceiling until horizon
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p.isFloor = 0;
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Unit ceilCameraDiff =
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_ceilFunction != 0 ?
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absVal(worldZPrevCeil) * VERTICAL_DEPTH_MULTIPLY : UNITS_PER_SQUARE;
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for (int_maybe32_t i = y2; i < y; ++i)
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{
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p.position.y = i;
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p.depth = (i - _cHorizontalDepthStart) * _horizontalDepthStep + ceilCameraDiff;
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_pixelFunction(&p);
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}
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#undef VERTICAL_DEPTH_MULTIPLY
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#endif
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}
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void _columnFunctionSimple(HitResult *hits, uint16_t hitCount, uint16_t x,
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