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Fix bug

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This commit is contained in:
Miloslav Číž 2019-06-01 17:58:32 +02:00
parent 91e078b920
commit fbab60d893
2 changed files with 28 additions and 4 deletions
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12
small3dlib.h
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@ -1485,14 +1485,20 @@ void S3L_drawTriangle(
}
#if S3L_PERSPECTIVE_CORRECTION == 1
S3L_ScreenCoord i = lXClipped - lX; /* helper var to save one
substraction in the inner loop */
S3L_ScreenCoord i = lXClipped - lX - 1; /* helper var to save one
substraction in the inner
loop */
#endif
// draw the row -- inner loop:
for (S3L_ScreenCoord x = lXClipped; x < rXClipped; ++x)
{
#if S3L_PERSPECTIVE_CORRECTION == 1
++i; /* Has to be done here, because the following tests can skip the
the rest of the loop. */
#endif
#if S3L_STENCIL_BUFFER
if (!S3L_stencilTest(x,p.y))
continue;
@ -1531,8 +1537,6 @@ void S3L_drawTriangle(
(lOverZ - S3L_interpolateFrom0(lOverZ,i,rowLength))
* p.depth
) / S3L_FRACTIONS_PER_UNIT;
i++;
#else
*barycentric0 = S3L_getFastLerpValue(b0FLS);
*barycentric1 = S3L_getFastLerpValue(b1FLS);

20
testSDL.c
View file

@ -11,6 +11,7 @@
#define S3L_PERSPECTIVE_CORRECTION 1
#define S3L_Z_BUFFER 1
#define S3L_SORT 0
#define S3L_PIXEL_FUNCTION drawPixel
@ -32,6 +33,7 @@ S3L_Scene scene;
int8_t keys[256];
const uint8_t testTexture[] =
/*
{
2,2,2,0,0,0,2,2,2,2,0,0,0,2,2,2,
2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,
@ -50,6 +52,24 @@ const uint8_t testTexture[] =
2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,
2,2,2,0,0,0,2,2,2,2,0,0,0,2,2,2
};
*/
{
0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,
1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,
2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,
0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,
1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,
2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,
0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,
1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,
2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,
0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,
1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,
2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,
0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,
1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,
2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2
};
uint32_t pixels[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];