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Refactor a bit

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This commit is contained in:
Miloslav Číž 2019-06-25 17:00:34 +02:00
parent 8c406d8945
commit bb3d1fa5d6
1 changed files with 11 additions and 12 deletions
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23
small3dlib.h
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@ -2,8 +2,6 @@
#define SMALL3DLIB_H #define SMALL3DLIB_H
/* /*
WIP
Simple realtime 3D software rasterization renderer. It is fast, focused on Simple realtime 3D software rasterization renderer. It is fast, focused on
resource-limited computers, located in a single C header file, with no resource-limited computers, located in a single C header file, with no
dependencies, using only integer arithmetics. dependencies, using only integer arithmetics.
@ -1731,7 +1729,7 @@ void S3L_drawTriangle(
S3L_initPixelInfo(&p); S3L_initPixelInfo(&p);
p.modelIndex = modelIndex; p.modelIndex = modelIndex;
p.triangleIndex = triangleIndex; p.triangleIndex = triangleIndex;
p.triangleID = modelIndex << 16 | triangleIndex; p.triangleID = (modelIndex << 16) | triangleIndex;
#if !S3L_STRICT_NEAR_CULLING #if !S3L_STRICT_NEAR_CULLING
point0.z = point0.z >= S3L_NEAR ? point0.z : S3L_NEAR; point0.z = point0.z >= S3L_NEAR ? point0.z : S3L_NEAR;
@ -1747,7 +1745,7 @@ void S3L_drawTriangle(
S3L_Unit *barycentric1; // bar. coord that gets higher from R to L S3L_Unit *barycentric1; // bar. coord that gets higher from R to L
S3L_Unit *barycentric2; // bar. coord that gets higher from bottom up S3L_Unit *barycentric2; // bar. coord that gets higher from bottom up
// sort the points: // sort the vertices:
#define assignPoints(t,a,b)\ #define assignPoints(t,a,b)\
{\ {\
@ -1793,8 +1791,8 @@ void S3L_drawTriangle(
#endif #endif
p.triangleSize[0] = rPointSS->x - lPointSS->x; p.triangleSize[0] = rPointSS->x - lPointSS->x;
p.triangleSize[1] = (rPointSS->y > lPointSS->y ? rPointSS->y : lPointSS->y) p.triangleSize[1] =
- tPointSS->y; (rPointSS->y > lPointSS->y ? rPointSS->y : lPointSS->y) - tPointSS->y;
// now draw the triangle line by line: // now draw the triangle line by line:
@ -1821,7 +1819,7 @@ void S3L_drawTriangle(
/* We'll be using an algorithm similar to Bresenham line algorithm. The /* We'll be using an algorithm similar to Bresenham line algorithm. The
specifics of this algorithm are among others: specifics of this algorithm are among others:
- drawing possibly a NON-CONTINUOUS line - drawing possibly NON-CONTINUOUS line
- NOT tracing the line exactly, but rather rasterizing one the right - NOT tracing the line exactly, but rather rasterizing one the right
side of it, according to the pixel CENTERS, INCLUDING the pixel side of it, according to the pixel CENTERS, INCLUDING the pixel
centers centers
@ -1951,8 +1949,8 @@ void S3L_drawTriangle(
while (currentY < endY) /* draw the triangle from top to bottom -- the while (currentY < endY) /* draw the triangle from top to bottom -- the
bottom-most row is left out because, following bottom-most row is left out because, following
from the rasterization rules (see top of the from the rasterization rules (see start of the
source), it is to never be rasterized. */ file), it is to never be rasterized. */
{ {
if (currentY == splitY) // reached a vertical split of the triangle? if (currentY == splitY) // reached a vertical split of the triangle?
{ {
@ -1981,8 +1979,9 @@ void S3L_drawTriangle(
stepSide(l) stepSide(l)
if (currentY >= 0) /* clipping of pixels whose y < 0 (can't be easily done if (currentY >= 0) /* clipping of pixels whose y < 0 (can't be easily done
outside the loop) */ outside the loop because of the Bresenham-like
{ algorithm steps) */
{
p.y = currentY; p.y = currentY;
// draw the horizontal line // draw the horizontal line
@ -2582,4 +2581,4 @@ void S3L_drawScene(S3L_Scene scene)
#endif #endif
} }
#endif #endif // guard