williamjcm/raycastlib
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Add texturing

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This commit is contained in:
Miloslav Číž 2018-09-03 14:23:11 +02:00
parent 3173d76c5d
commit 4172f44731
1 changed files with 35 additions and 13 deletions
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38
raycastlib.h
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@ -77,8 +77,7 @@ typedef struct
Vector2D position; ///< Exact collision position in Units. Vector2D position; ///< Exact collision position in Units.
Unit distance; /**< Euclidean distance to the hit position, or -1 if Unit distance; /**< Euclidean distance to the hit position, or -1 if
no collision happened. */ no collision happened. */
Unit textureCoord; /**< Normalized (0 to UNITS_PER_SQUARE - 1) texture Unit textureCoord; /// Normalized (0 to UNITS_PER_SQUARE - 1) tex coord.
coordinate. */
uint8_t direction; ///< Direction of hit. uint8_t direction; ///< Direction of hit.
} HitResult; } HitResult;
@ -97,6 +96,7 @@ typedef struct
int8_t isWall; ///< Whether the pixel is a wall or a floor(/ceiling). int8_t isWall; ///< Whether the pixel is a wall or a floor(/ceiling).
Unit depth; ///< Corrected depth. Unit depth; ///< Corrected depth.
HitResult hit; ///< Corresponding ray hit. HitResult hit; ///< Corresponding ray hit.
Unit textureCoordY; ///< Normalized (0 to UNITS_PER_SQUARE - 1) tex coord.
} PixelInfo; } PixelInfo;
typedef struct typedef struct
@ -441,13 +441,25 @@ void castRayMultiHit(Ray ray, ArrayFunction arrayFunc, HitResult *hitResults,
h.distance = dist(initialPos,currentPos); h.distance = dist(initialPos,currentPos);
if (no.y > 0) if (no.y > 0)
{
h.direction = 0; h.direction = 0;
h.textureCoord = co.x;
}
else if (no.x > 0) else if (no.x > 0)
{
h.direction = 1; h.direction = 1;
h.textureCoord = co.y;
}
else if (no.y < 0) else if (no.y < 0)
{
h.direction = 2; h.direction = 2;
h.textureCoord = co.x;
}
else else
{
h.direction = 3; h.direction = 3;
h.textureCoord = co.y;
}
hitResults[*hitResultsLen] = h; hitResults[*hitResultsLen] = h;
@ -569,29 +581,37 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
Unit worldZ2Ceil = (UNITS_PER_SQUARE * 5 - wallHeight) - _camera.height; Unit worldZ2Ceil = (UNITS_PER_SQUARE * 5 - wallHeight) - _camera.height;
Unit z1Screen = _middleRow - perspectiveScale( int_maybe32_t z1Screen = _middleRow - perspectiveScale(
(worldZPrev * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1); (worldZPrev * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1);
int_maybe32_t z1ScreenNoClamp = z1Screen;
z1Screen = clamp(z1Screen,0,_camResYLimit); z1Screen = clamp(z1Screen,0,_camResYLimit);
Unit z1ScreenCeil = _middleRow - perspectiveScale( int_maybe32_t z1ScreenCeil = _middleRow - perspectiveScale(
(worldZPrevCeil * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1); (worldZPrevCeil * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1);
int_maybe32_t z1ScreenCeilNoClamp = z1ScreenCeil;
z1ScreenCeil = clamp(z1ScreenCeil,0,_camResYLimit); z1ScreenCeil = clamp(z1ScreenCeil,0,_camResYLimit);
Unit z2Screen = _middleRow - perspectiveScale( int_maybe32_t z2Screen = _middleRow - perspectiveScale(
(worldZ2 * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1); (worldZ2 * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1);
int_maybe32_t wallScreenHeightNoClamp = z2Screen - z1ScreenNoClamp;
z2Screen = clamp(z2Screen,0,_camResYLimit); z2Screen = clamp(z2Screen,0,_camResYLimit);
Unit z2ScreenCeil = _middleRow - perspectiveScale( int_maybe32_t z2ScreenCeil = _middleRow - perspectiveScale(
(worldZ2Ceil * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1); (worldZ2Ceil * _camera.resolution.y) / UNITS_PER_SQUARE,dist,1);
int_maybe32_t wallScreenHeightCeilNoClamp = z2ScreenCeil - z1ScreenCeilNoClamp;
z2ScreenCeil = clamp(z2ScreenCeil,0,_camResYLimit); z2ScreenCeil = clamp(z2ScreenCeil,0,_camResYLimit);
Unit zTop = z1Screen < z2Screen ? z1Screen : z2Screen; int_maybe32_t zTop = z1Screen < z2Screen ? z1Screen : z2Screen;
Unit zBottomCeil = z1ScreenCeil > z2ScreenCeil ? int_maybe32_t zBottomCeil = z1ScreenCeil > z2ScreenCeil ?
z1ScreenCeil : z2ScreenCeil; z1ScreenCeil : z2ScreenCeil;
if (zTop <= zBottomCeil) if (zTop <= zBottomCeil)
@ -630,6 +650,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
{ {
p.position.y = i; p.position.y = i;
p.hit = hit; p.hit = hit;
p.textureCoordY = ((i - z1ScreenNoClamp) * UNITS_PER_SQUARE) / wallScreenHeightNoClamp;
_pixelFunction(p); _pixelFunction(p);
} }
@ -640,6 +661,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
{ {
p.position.y = i; p.position.y = i;
p.hit = hit; p.hit = hit;
p.textureCoordY = ((i - z1ScreenCeilNoClamp) * UNITS_PER_SQUARE) / wallScreenHeightCeilNoClamp;
_pixelFunction(p); _pixelFunction(p);
} }