mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
928085d5fb
Adapt PR #14's biased 32.32 triangle edge DDA and half-open bottom/right coverage across the software raster paths, with a focused pure edge-math regression test. Source: https://github.com/mstan/psxrecomp/pull/14 Source-commit: https://github.com/mstan/psxrecomp/commit/91a654f61dff18806f3eea43f72a30cb34430695 Co-authored-by: Kareem Olim <kareemolim@gmail.com>
29 lines
965 B
C
29 lines
965 B
C
#include "../src/gpu_sw_edges.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
static int failures;
|
|
#define CHECK(condition, message) do { \
|
|
if (!(condition)) { fprintf(stderr, "FAIL: %s\n", message); failures++; } \
|
|
} while (0)
|
|
|
|
int main(void) {
|
|
int long_x = 0, short_x = 0;
|
|
|
|
/* A right triangle's final scanline is y2-1; y2 itself is excluded by the
|
|
* caller. Pin the DDA values used to produce the half-open X span. */
|
|
psx_triangle_edges_at_y(0, 0, 8, 0, 0, 8, 0, &long_x, &short_x);
|
|
CHECK(long_x == 0 && short_x == 8, "top scanline spans [0,8)");
|
|
psx_triangle_edges_at_y(0, 0, 8, 0, 0, 8, 7, &long_x, &short_x);
|
|
CHECK(long_x == 0 && short_x == 1, "last scanline spans one pixel");
|
|
|
|
CHECK(psx_edge_step(8, 8) == (1LL << 32),
|
|
"positive unit slope has exact 32.32 step");
|
|
CHECK(psx_edge_step(-8, 8) == -(1LL << 32),
|
|
"negative unit slope has exact 32.32 step");
|
|
|
|
if (failures) return 1;
|
|
puts("ALL PASS");
|
|
return 0;
|
|
}
|