dan/TIC-80-guile
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Merge pull request #539 from MonstersGoBoom/master

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textri clipping works .
This commit is contained in:
Vadim Grigoruk
2018-02-22 09:04:01 +03:00
committed by GitHub
parent ce83d422be 4e857f9683
commit 69f55b9f94
1 changed files with 69 additions and 50 deletions
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69
src/tic.c
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@@ -845,7 +845,7 @@ static void setSidePixel(s32 x, s32 y)
static void setSideTexPixel(s32 x, s32 y, float u, float v) static void setSideTexPixel(s32 x, s32 y, float u, float v)
{ {
s32 yy = (s32)y; s32 yy = y;
if (yy >= 0 && yy < TIC80_HEIGHT) if (yy >= 0 && yy < TIC80_HEIGHT)
{ {
if (x < SidesBuffer.Left[yy]) if (x < SidesBuffer.Left[yy])
@@ -967,11 +967,16 @@ static void ticTexLine(tic_mem* memory, TexVert *v0, TexVert *v1)
} }
float dy = bot->y - top->y; float dy = bot->y - top->y;
if ((s32)dy == 0) return; float step_x = (bot->x - top->x);
float step_u = (bot->u - top->u);
float step_v = (bot->v - top->v);
float step_x = (bot->x - top->x) / dy; if ((s32)dy != 0)
float step_u = (bot->u - top->u) / dy; {
float step_v = (bot->v - top->v) / dy; step_x /= dy;
step_u /= dy;
step_v /= dy;
}
float x = top->x; float x = top->x;
float y = top->y; float y = top->y;
@@ -993,7 +998,7 @@ static void ticTexLine(tic_mem* memory, TexVert *v0, TexVert *v1)
if(botY > TIC80_HEIGHT) if(botY > TIC80_HEIGHT)
botY = TIC80_HEIGHT; botY = TIC80_HEIGHT;
for (; y < botY; y++) for (; y <botY; ++y)
{ {
setSideTexPixel(x, y, u, v); setSideTexPixel(x, y, u, v);
x += step_x; x += step_x;
@@ -1009,9 +1014,9 @@ static void api_textri(tic_mem* memory, float x1, float y1, float x2, float y2,
const u8* ptr = memory->ram.tiles.data[0].data; const u8* ptr = memory->ram.tiles.data[0].data;
const u8* map = memory->ram.map.data; const u8* map = memory->ram.map.data;
V0.x = (float)x1; V0.y = (float)y1; V0.u = (float)u1; V0.v = (float)v1; V0.x = x1; V0.y = y1; V0.u = u1; V0.v = v1;
V1.x = (float)x2; V1.y = (float)y2; V1.u = (float)u2; V1.v = (float)v2; V1.x = x2; V1.y = y2; V1.u = u2; V1.v = v2;
V2.x = (float)x3; V2.y = (float)y3; V2.u = (float)u3; V2.v = (float)v3; V2.x = x3; V2.y = y3; V2.u = u3; V2.v = v3;
// calculate the slope of the surface // calculate the slope of the surface
// use floats here // use floats here
@@ -1028,54 +1033,69 @@ static void api_textri(tic_mem* memory, float x1, float y1, float x2, float y2,
// convert to fixed // convert to fixed
s32 dudxs = dudx * 65536.0f; s32 dudxs = dudx * 65536.0f;
s32 dvdxs = dvdx * 65536.0f; s32 dvdxs = dvdx * 65536.0f;
// fill the buffer
initSidesBuffer(); initSidesBuffer();
// parse each line and decide where in the buffer to store them ( left or right )
ticTexLine(memory, &V0, &V1); ticTexLine(memory, &V0, &V1);
ticTexLine(memory, &V1, &V2); ticTexLine(memory, &V1, &V2);
ticTexLine(memory, &V2, &V0); ticTexLine(memory, &V2, &V0);
{
for (s32 y = 0; y < TIC80_HEIGHT; y++) for (s32 y = 0; y < TIC80_HEIGHT; y++)
{ {
float width = SidesBuffer.Right[y] - SidesBuffer.Left[y]; // if it's backwards skip it
s32 width = SidesBuffer.Right[y] - SidesBuffer.Left[y];
// if it's off top or bottom , skip this line
if ((y < machine->state.clip.t) || (y > machine->state.clip.b))
width = 0;
if (width > 0) if (width > 0)
{ {
s32 u = SidesBuffer.ULeft[y]; s32 u = SidesBuffer.ULeft[y];
s32 v = SidesBuffer.VLeft[y]; s32 v = SidesBuffer.VLeft[y];
s32 left = SidesBuffer.Left[y];
for (s32 x = (s32)SidesBuffer.Left[y]; x <= (s32)SidesBuffer.Right[y]; ++x) s32 right = SidesBuffer.Right[y];
{ // check right edge, and clamp it
if ((x >= 0) && (x < TIC80_WIDTH)) if (right > machine->state.clip.r)
right = machine->state.clip.r;
// check left edge and offset UV's if we are off the left
if (left < machine->state.clip.l)
{ {
s32 dist = machine->state.clip.l - SidesBuffer.Left[y];
u += dudxs * dist;
v += dvdxs * dist;
left = machine->state.clip.l;
}
// are we drawing from the map . ok then at least check before the inner loop
if (use_map == true) if (use_map == true)
{ {
enum {MapWidth = TIC_MAP_WIDTH * TIC_SPRITESIZE, MapHeight = TIC_MAP_HEIGHT * TIC_SPRITESIZE}; for (s32 x = left; x <= right; ++x)
{
enum { MapWidth = TIC_MAP_WIDTH * TIC_SPRITESIZE, MapHeight = TIC_MAP_HEIGHT * TIC_SPRITESIZE };
s32 iu = (u >> 16) % MapWidth; s32 iu = (u >> 16) % MapWidth;
s32 iv = (v >> 16) % MapHeight; s32 iv = (v >> 16) % MapHeight;
while (iu < 0) iu += MapWidth; while (iu < 0) iu += MapWidth;
while (iv < 0) iv += MapHeight; while (iv < 0) iv += MapHeight;
u8 tile = map[(iv >> 3) * TIC_MAP_WIDTH + (iu >> 3)];
u8 tile = map[(iv>>3) * TIC_MAP_WIDTH + (iu>>3)];
const u8 *buffer = &ptr[tile << 5]; const u8 *buffer = &ptr[tile << 5];
u8 color = tic_tool_peek4(buffer, (iu & 7) + ((iv & 7) << 3)); u8 color = tic_tool_peek4(buffer, (iu & 7) + ((iv & 7) << 3));
if (color != chroma) if (color != chroma)
setPixel(machine, x, y, color); setPixel(machine, x, y, color);
u += dudxs;
v += dvdxs;
}
} }
else else
{
// direct from tile ram
for (s32 x = left; x <= right; ++x)
{ {
enum{SheetWidth = TIC_SPRITESHEET_SIZE, SheetHeight = TIC_SPRITESHEET_SIZE * TIC_SPRITE_BANKS}; enum{SheetWidth = TIC_SPRITESHEET_SIZE, SheetHeight = TIC_SPRITESHEET_SIZE * TIC_SPRITE_BANKS};
s32 iu = (u>>16) & (SheetWidth - 1); s32 iu = (u>>16) & (SheetWidth - 1);
s32 iv = (v>>16) & (SheetHeight - 1); s32 iv = (v>>16) & (SheetHeight - 1);
const u8 *buffer = &ptr[((iu >> 3) + ((iv >> 3) << 4)) << 5]; const u8 *buffer = &ptr[((iu >> 3) + ((iv >> 3) << 4)) << 5];
u8 color = tic_tool_peek4(buffer, (iu & 7) + ((iv & 7) << 3)); u8 color = tic_tool_peek4(buffer, (iu & 7) + ((iv & 7) << 3));
if (color != chroma) if (color != chroma)
setPixel(machine, x, y, color); setPixel(machine, x, y, color);
}
}
u += dudxs; u += dudxs;
v += dvdxs; v += dvdxs;
} }
@@ -1085,7 +1105,6 @@ static void api_textri(tic_mem* memory, float x1, float y1, float x2, float y2,
} }
static void api_sprite(tic_mem* memory, const tic_tiles* src, s32 index, s32 x, s32 y, u8* colors, s32 count) static void api_sprite(tic_mem* memory, const tic_tiles* src, s32 index, s32 x, s32 y, u8* colors, s32 count)
{ {
drawSprite(memory, src, index, x, y, colors, count, 1, tic_no_flip, tic_no_rotate); drawSprite(memory, src, index, x, y, colors, count, 1, tic_no_flip, tic_no_rotate);