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Miloslav Číž 2019-05-05 02:42:16 +02:00
parent 0bbd8105b0
commit 0a27bbe2b5
2 changed files with 56 additions and 6 deletions
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4
s3l.h
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@ -89,6 +89,10 @@
- Adjacent triangles don't have any overlapping pixels, nor gaps between. - Adjacent triangles don't have any overlapping pixels, nor gaps between.
- Triangles of points that lie on a single line are NOT rasterized. - Triangles of points that lie on a single line are NOT rasterized.
- A single "long" triangle CAN be rasterized as non-continuous. - A single "long" triangle CAN be rasterized as non-continuous.
- Transforming (e.g. mirroring, rotating by 90 degrees etc.) a result of
rasterizing triangle A is NOT generally equal to applying the same
transformation to triangle A first and then rasterizing it. Even the number
of rasterized pixels is usually different.
- If specifying a triangle with integer coordinates, then: - If specifying a triangle with integer coordinates, then:
- a Bottom-most corner (or side) of a triangle is never rasterized (because - a Bottom-most corner (or side) of a triangle is never rasterized (because
it is connected to a right side). it is connected to a right side).

58
test.c
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@ -75,6 +75,14 @@ uint16_t testRasterization()
uint16_t numErrors = 0; uint16_t numErrors = 0;
uint8_t pixelsEmpty[TEST_BUFFER_W * TEST_BUFFER_H];
memset(pixelsEmpty,0,TEST_BUFFER_W * TEST_BUFFER_H);
numErrors += testTriangleRasterization(5,3, 3,3, 9,3, pixelsEmpty);
numErrors += testTriangleRasterization(9,4, 9,0, 9,9, pixelsEmpty);
numErrors += testTriangleRasterization(3,3, 6,6, 7,7, pixelsEmpty);
numErrors += testTriangleRasterization(5,5, 3,7, 9,1, pixelsEmpty);
uint8_t pixels1[TEST_BUFFER_W * TEST_BUFFER_H] = uint8_t pixels1[TEST_BUFFER_W * TEST_BUFFER_H] =
{ {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F // 0 1 2 3 4 5 6 7 8 9 A B C D E F
@ -167,13 +175,51 @@ uint16_t testRasterization()
numErrors += testTriangleRasterization(4,8, 4,2, 0,0, pixels4); numErrors += testTriangleRasterization(4,8, 4,2, 0,0, pixels4);
uint8_t pixelsEmpty[TEST_BUFFER_W * TEST_BUFFER_H]; uint8_t pixels5[TEST_BUFFER_W * TEST_BUFFER_H] =
memset(pixelsEmpty,0,TEST_BUFFER_W * TEST_BUFFER_H); {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 0
0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1
0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0, // 2
0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0, // 3
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 4
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 5
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 6
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 7
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 8
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 9
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // A
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // B
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // C
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // D
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // E
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 // F
};
numErrors += testTriangleRasterization(5,3, 3,3, 9,3, pixelsEmpty); numErrors += testTriangleRasterization(6,2, 2,4, 0,0, pixels5);
numErrors += testTriangleRasterization(9,4, 9,0, 9,9, pixelsEmpty);
numErrors += testTriangleRasterization(3,3, 6,6, 7,7, pixelsEmpty); uint8_t pixels6[TEST_BUFFER_W * TEST_BUFFER_H] =
numErrors += testTriangleRasterization(5,5, 3,7, 9,1, pixelsEmpty); {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 0
0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0, // 1
1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0, // 2
0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0, // 3
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 4
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 5
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 6
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 7
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 8
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 9
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // A
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // B
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // C
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // D
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // E
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 // F
};
numErrors += testTriangleRasterization(0,2, 6,0, 4,4, pixels6);
printf("total rasterization errors: %d\n",numErrors); printf("total rasterization errors: %d\n",numErrors);
} }