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Speed up drawTile. 

Clip the tile in all orientations.
Speed up blitting for scale=1.
This commit is contained in:
František Jahoda 2017-11-27 21:32:27 +01:00
parent fce433d272
commit 0bc1022b67
1 changed files with 43 additions and 27 deletions
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70
src/tic.c
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@ -20,6 +20,7 @@
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
@ -244,39 +245,54 @@ static void drawRectBorder(tic_machine* machine, s32 x, s32 y, s32 width, s32 he
drawVLine(machine, x + width - 1, y, height, color);
}
#define DRAW_TILE_BODY(index_expr) ({\
y += sy; \
for(s32 py=sy; py < ey; py++, y++) \
{ \
s32 xx = x + sx; \
for(s32 px=sx; px < ex; px++, xx++) \
{ \
u8 color = mapping[tic_tool_peek4(buffer, index_expr)]; \
if(color != 255) tic_tool_poke4(machine->memory.ram.vram.screen.data, y * TIC80_WIDTH + xx, color); \
} \
} \
})
static void drawTile(tic_machine* machine, const tic_tile* buffer, s32 x, s32 y, u8* colors, s32 count, s32 scale, tic_flip flip, tic_rotate rotate)
{
static u8 transparent[TIC_PALETTE_SIZE];
memset(transparent, 0, sizeof(transparent));
for (s32 i = 0; i < count; i++) transparent[colors[i]] = 1;
static u8 mapping[TIC_PALETTE_SIZE];
for (s32 i = 0; i < TIC_PALETTE_SIZE; i++) mapping[i] = tic_tool_peek4(machine->memory.ram.vram.mapping, i);
for (s32 i = 0; i < count; i++) mapping[colors[i]] = 255;
flip &= 0b11;
rotate &= 0b11;
u32 orientation = flip & 0b11;
if (flip == 0 && rotate == 0 && scale == 1) {
if(rotate == tic_90_rotate) orientation ^= 0b001;
else if(rotate == tic_180_rotate) orientation ^= 0b011;
else if(rotate == tic_270_rotate) orientation ^= 0b010;
if (rotate == tic_90_rotate || rotate == tic_270_rotate) orientation |= 0b100;
if (scale == 1) {
// the most common path
s32 i = 0;
for(s32 py=0; py < TIC_SPRITESIZE; py++, y++)
{
s32 xx = x;
for(s32 px=0; px < TIC_SPRITESIZE; px++, xx++)
{
u8 color = tic_tool_peek4(buffer, i++);
if(!transparent[color]) setPixel(machine, xx, y, color);
}
s32 sx, sy, ex, ey;
sx = machine->state.clip.l - x; if (sx < 0) sx = 0;
sy = machine->state.clip.t - y; if (sy < 0) sy = 0;
ex = machine->state.clip.r - x; if (ex > TIC_SPRITESIZE) ex = TIC_SPRITESIZE;
ey = machine->state.clip.b - y; if (ey > TIC_SPRITESIZE) ey = TIC_SPRITESIZE;
switch (orientation) {
case 0b100: DRAW_TILE_BODY(px * TIC_SPRITESIZE + py); break;
case 0b110: DRAW_TILE_BODY(px * TIC_SPRITESIZE + TIC_SPRITESIZE - py - 1); break;
case 0b101: DRAW_TILE_BODY((TIC_SPRITESIZE - px - 1) * TIC_SPRITESIZE + py); break;
case 0b111: DRAW_TILE_BODY((TIC_SPRITESIZE - px) * TIC_SPRITESIZE - py - 1); break;
case 0b000: DRAW_TILE_BODY(py * TIC_SPRITESIZE + px); break;
case 0b010: DRAW_TILE_BODY((TIC_SPRITESIZE - py - 1) * TIC_SPRITESIZE + px); break;
case 0b001: DRAW_TILE_BODY(py * TIC_SPRITESIZE + TIC_SPRITESIZE - px - 1); break;
case 0b011: DRAW_TILE_BODY((TIC_SPRITESIZE - py) * TIC_SPRITESIZE - px - 1); break;
default: assert(!"Unknown value of orientation in drawTile");
}
return;
}
s32 a = flip & tic_horz_flip ? -1 : 1;
s32 b = flip & tic_vert_flip ? -1 : 1;
if(rotate == tic_90_rotate) a = -a;
else if(rotate == tic_180_rotate) a = -a, b = -b;
else if(rotate == tic_270_rotate) b = -b;
bool swap_axis = (rotate == tic_90_rotate || rotate == tic_270_rotate);
for(s32 py=0; py < TIC_SPRITESIZE; py++, y+=scale)
{
s32 xx = x;
@ -284,15 +300,15 @@ static void drawTile(tic_machine* machine, const tic_tile* buffer, s32 x, s32 y,
{
s32 i;
s32 ix, iy;
ix = a == 1 ? px : TIC_SPRITESIZE - px - 1;
iy = b == 1 ? py : TIC_SPRITESIZE - py - 1;
if(swap_axis) {
ix = orientation & 0b001 ? TIC_SPRITESIZE - px - 1: px;
iy = orientation & 0b010 ? TIC_SPRITESIZE - py - 1: py;
if(orientation & 0b100) {
i = ix * TIC_SPRITESIZE + iy;
} else {
i = iy * TIC_SPRITESIZE + ix;
}
u8 color = tic_tool_peek4(buffer, i);
if(!transparent[color]) {
if(mapping[color] != 255) {
if (scale == 1) {
setPixel(machine, xx, y, color);
} else {