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Speed up triangle rasterisation

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This commit is contained in:
Phil Bennett 2010-01-20 09:47:04 +00:00
parent 093637cc29
commit f6f342c06b
2 changed files with 38 additions and 13 deletions
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41
src/mame/video/micro3d.c
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@ -511,6 +511,8 @@ static void draw_triangles(micro3d_state *state, UINT32 attr)
int i; int i;
int triangles = 0; int triangles = 0;
int vertices = state->fifo_idx / 3; int vertices = state->fifo_idx / 3;
int min_y = 0x3ff;
int max_y = 0;
/* This satisifes the burst write test */ /* This satisifes the burst write test */
if (vertices == 0) if (vertices == 0)
@ -568,11 +570,12 @@ static void draw_triangles(micro3d_state *state, UINT32 attr)
clip_vertices = clip_triangle(state, vclip_list, vclip_list, clip_vertices, CLIP_Y_MIN); clip_vertices = clip_triangle(state, vclip_list, vclip_list, clip_vertices, CLIP_Y_MIN);
/* Rasterise */ /* Rasterise */
for (k = 2; k < clip_vertices; ++k) if (clip_vertices >= 3)
{ {
micro3d_vtx a = vclip_list[0]; micro3d_vtx a = vclip_list[0];
micro3d_vtx b = vclip_list[k - 1]; micro3d_vtx b = vclip_list[1];
micro3d_vtx c = vclip_list[k];
triangles = TRUE;
a.x += state->x_mid; a.x += state->x_mid;
a.y += state->y_mid; a.y += state->y_mid;
@ -580,19 +583,41 @@ static void draw_triangles(micro3d_state *state, UINT32 attr)
b.x += state->x_mid; b.x += state->x_mid;
b.y += state->y_mid; b.y += state->y_mid;
/* Keep track of the y-extents so we don't have to scan every line later */
if (a.y < min_y)
min_y = a.y;
if (a.y > max_y)
max_y = a.y;
if (b.y < min_y)
min_y = b.y;
if (b.y > max_y)
max_y = b.y;
/* Draw the first line of the triangle/fan */
draw_line(state, a.x, a.y, b.x, b.y);
for (k = 2; k < clip_vertices; ++k)
{
micro3d_vtx c = vclip_list[k];
c.x += state->x_mid; c.x += state->x_mid;
c.y += state->y_mid; c.y += state->y_mid;
/* TODO: Don't draw lines twice */ if (c.y < min_y)
draw_line(state, a.x, a.y, b.x, b.y); min_y = c.y;
if (c.y > max_y)
max_y = c.y;
draw_line(state, b.x, b.y, c.x, c.y); draw_line(state, b.x, b.y, c.x, c.y);
draw_line(state, a.x, a.y, c.x, c.y); draw_line(state, a.x, a.y, c.x, c.y);
triangles = TRUE; b = c;
}
} }
} }
if (triangles) if (triangles == TRUE)
rasterise_spans(state, 0, 399, attr); rasterise_spans(state, min_y, max_y, attr);
} }