diff options
Diffstat (limited to 'xorg-server/hw/kdrive/src/kaapict.c')
| -rw-r--r-- | xorg-server/hw/kdrive/src/kaapict.c | 719 |
1 files changed, 719 insertions, 0 deletions
diff --git a/xorg-server/hw/kdrive/src/kaapict.c b/xorg-server/hw/kdrive/src/kaapict.c new file mode 100644 index 000000000..501b6b9c4 --- /dev/null +++ b/xorg-server/hw/kdrive/src/kaapict.c @@ -0,0 +1,719 @@ +/* + * Copyright © 2001 Keith Packard + * + * Partly based on code that is Copyright © The XFree86 Project Inc. + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of Keith Packard not be used in + * advertising or publicity pertaining to distribution of the software without + * specific, written prior permission. Keith Packard makes no + * representations about the suitability of this software for any purpose. It + * is provided "as is" without express or implied warranty. + * + * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#ifdef HAVE_CONFIG_H +#include <kdrive-config.h> +#endif +#include "kdrive.h" +#include "kaa.h" + +#ifdef RENDER +#include "mipict.h" + +#define KAA_DEBUG_FALLBACKS 0 + +#if KAA_DEBUG_FALLBACKS +static void kaaCompositeFallbackPictDesc(PicturePtr pict, char *string, int n) +{ + char format[20]; + char size[20]; + char loc; + int temp; + + if (!pict) { + snprintf(string, n, "None"); + return; + } + + switch (pict->format) + { + case PICT_a8r8g8b8: + snprintf(format, 20, "ARGB8888"); + break; + case PICT_r5g6b5: + snprintf(format, 20, "RGB565 "); + break; + case PICT_x1r5g5b5: + snprintf(format, 20, "RGB555 "); + break; + case PICT_a8: + snprintf(format, 20, "A8 "); + break; + case PICT_a1: + snprintf(format, 20, "A1 "); + break; + default: + snprintf(format, 20, "0x%x", (int)pict->format); + break; + } + + loc = kaaGetOffscreenPixmap(pict->pDrawable, &temp, &temp) ? 's' : 'm'; + + snprintf(size, 20, "%dx%d%s", pict->pDrawable->width, + pict->pDrawable->height, pict->repeat ? + " R" : ""); + + snprintf(string, n, "0x%lx:%c fmt %s (%s)", (long)pict, loc, format, size); +} + +static void +kaaPrintCompositeFallback(CARD8 op, + PicturePtr pSrc, + PicturePtr pMask, + PicturePtr pDst) +{ + char sop[20]; + char srcdesc[40], maskdesc[40], dstdesc[40]; + + switch(op) + { + case PictOpSrc: + sprintf(sop, "Src"); + break; + case PictOpOver: + sprintf(sop, "Over"); + break; + default: + sprintf(sop, "0x%x", (int)op); + break; + } + + kaaCompositeFallbackPictDesc(pSrc, srcdesc, 40); + kaaCompositeFallbackPictDesc(pMask, maskdesc, 40); + kaaCompositeFallbackPictDesc(pDst, dstdesc, 40); + + ErrorF("Composite fallback: op %s, \n" + " src %s, \n" + " mask %s, \n" + " dst %s, \n", + sop, srcdesc, maskdesc, dstdesc); +} + +static void +kaaPrintTrapezoidFallback(PicturePtr pDst) +{ + char dstdesc[40]; + + kaaCompositeFallbackPictDesc(pDst, dstdesc, 40); + + ErrorF("Trapezoid fallback: dst %s, %c/%s\n", + dstdesc, + (pDst->polyMode == PolyModePrecise) ? 'p' : 'i', + (pDst->polyEdge == PolyEdgeSharp) ? "a" : "aa"); +} +#endif + +static Bool +kaaGetPixelFromRGBA(CARD32 *pixel, + CARD16 red, + CARD16 green, + CARD16 blue, + CARD16 alpha, + CARD32 format) +{ + int rbits, bbits, gbits, abits; + int rshift, bshift, gshift, ashift; + + *pixel = 0; + + if (!PICT_FORMAT_COLOR(format)) + return FALSE; + + rbits = PICT_FORMAT_R(format); + gbits = PICT_FORMAT_G(format); + bbits = PICT_FORMAT_B(format); + abits = PICT_FORMAT_A(format); + + if (PICT_FORMAT_TYPE(format) == PICT_TYPE_ARGB) { + bshift = 0; + gshift = bbits; + rshift = gshift + gbits; + ashift = rshift + rbits; + } else { /* PICT_TYPE_ABGR */ + rshift = 0; + gshift = rbits; + bshift = gshift + gbits; + ashift = bshift + bbits; + } + + *pixel |= ( blue >> (16 - bbits)) << bshift; + *pixel |= ( red >> (16 - rbits)) << rshift; + *pixel |= (green >> (16 - gbits)) << gshift; + *pixel |= (alpha >> (16 - abits)) << ashift; + + return TRUE; +} + + +static Bool +kaaGetRGBAFromPixel(CARD32 pixel, + CARD16 *red, + CARD16 *green, + CARD16 *blue, + CARD16 *alpha, + CARD32 format) +{ + int rbits, bbits, gbits, abits; + int rshift, bshift, gshift, ashift; + + if (!PICT_FORMAT_COLOR(format)) + return FALSE; + + rbits = PICT_FORMAT_R(format); + gbits = PICT_FORMAT_G(format); + bbits = PICT_FORMAT_B(format); + abits = PICT_FORMAT_A(format); + + if (PICT_FORMAT_TYPE(format) == PICT_TYPE_ARGB) { + bshift = 0; + gshift = bbits; + rshift = gshift + gbits; + ashift = rshift + rbits; + } else { /* PICT_TYPE_ABGR */ + rshift = 0; + gshift = rbits; + bshift = gshift + gbits; + ashift = bshift + bbits; + } + + *red = ((pixel >> rshift ) & ((1 << rbits) - 1)) << (16 - rbits); + while (rbits < 16) { + *red |= *red >> rbits; + rbits <<= 1; + } + + *green = ((pixel >> gshift ) & ((1 << gbits) - 1)) << (16 - gbits); + while (gbits < 16) { + *green |= *green >> gbits; + gbits <<= 1; + } + + *blue = ((pixel >> bshift ) & ((1 << bbits) - 1)) << (16 - bbits); + while (bbits < 16) { + *blue |= *blue >> bbits; + bbits <<= 1; + } + + if (abits) { + *alpha = ((pixel >> ashift ) & ((1 << abits) - 1)) << (16 - abits); + while (abits < 16) { + *alpha |= *alpha >> abits; + abits <<= 1; + } + } else + *alpha = 0xffff; + + return TRUE; +} + +static int +kaaTryDriverSolidFill(PicturePtr pSrc, + PicturePtr pDst, + INT16 xSrc, + INT16 ySrc, + INT16 xDst, + INT16 yDst, + CARD16 width, + CARD16 height) +{ + KaaScreenPriv (pDst->pDrawable->pScreen); + RegionRec region; + BoxPtr pbox; + int nbox; + int dst_off_x, dst_off_y; + PixmapPtr pSrcPix, pDstPix; + CARD32 pixel; + CARD16 red, green, blue, alpha; + + xDst += pDst->pDrawable->x; + yDst += pDst->pDrawable->y; + xSrc += pSrc->pDrawable->x; + ySrc += pSrc->pDrawable->y; + + if (!miComputeCompositeRegion (®ion, pSrc, NULL, pDst, + xSrc, ySrc, 0, 0, xDst, yDst, + width, height)) + return 1; + + if (pSrc->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseMemory ((PixmapPtr) pSrc->pDrawable); + if (pDst->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pDst->pDrawable); + + pDstPix = kaaGetOffscreenPixmap (pDst->pDrawable, &dst_off_x, &dst_off_y); + if (!pDstPix) { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 0; + } + + if (pSrc->pDrawable->type == DRAWABLE_WINDOW) + pSrcPix = (*pSrc->pDrawable->pScreen->GetWindowPixmap)( + (WindowPtr) (pSrc->pDrawable)); + else + pSrcPix = (PixmapPtr) (pSrc->pDrawable); + + /* If source is offscreen, we need to sync the accelerator + * before accessing it. We'd prefer for it to be in memory. + */ + if (kaaPixmapIsOffscreen(pSrcPix)) { + kaaWaitSync(pDst->pDrawable->pScreen); + } + + pixel = *(CARD32 *)(pSrcPix->devPrivate.ptr); + if (!kaaGetRGBAFromPixel(pixel, &red, &green, &blue, &alpha, + pSrc->format)) + { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return -1; + } + kaaGetPixelFromRGBA(&pixel, red, green, blue, alpha, + pDst->format); + + if (!(*pKaaScr->info->PrepareSolid) (pDstPix, GXcopy, 0xffffffff, pixel)) + { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return -1; + } + + nbox = REGION_NUM_RECTS(®ion); + pbox = REGION_RECTS(®ion); + while (nbox--) + { + (*pKaaScr->info->Solid) (pbox->x1 + dst_off_x, + pbox->y1 + dst_off_y, + pbox->x2 + dst_off_x, + pbox->y2 + dst_off_y); + pbox++; + } + + (*pKaaScr->info->DoneSolid) (); + kaaMarkSync (pDst->pDrawable->pScreen); + kaaDrawableDirty (pDst->pDrawable); + + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 1; +} + +static int +kaaTryDriverBlend(CARD8 op, + PicturePtr pSrc, + PicturePtr pDst, + INT16 xSrc, + INT16 ySrc, + INT16 xDst, + INT16 yDst, + CARD16 width, + CARD16 height) +{ + KaaScreenPriv (pDst->pDrawable->pScreen); + RegionRec region; + BoxPtr pbox; + int nbox; + int src_off_x, src_off_y, dst_off_x, dst_off_y; + PixmapPtr pSrcPix, pDstPix; + struct _Pixmap srcScratch; + + xDst += pDst->pDrawable->x; + yDst += pDst->pDrawable->y; + + xSrc += pSrc->pDrawable->x; + ySrc += pSrc->pDrawable->y; + + if (!miComputeCompositeRegion (®ion, pSrc, NULL, pDst, + xSrc, ySrc, 0, 0, xDst, yDst, + width, height)) + return 1; + + + if (pSrc->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pSrc->pDrawable); + if (pDst->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pDst->pDrawable); + + pSrcPix = kaaGetOffscreenPixmap (pSrc->pDrawable, &src_off_x, &src_off_y); + pDstPix = kaaGetOffscreenPixmap (pDst->pDrawable, &dst_off_x, &dst_off_y); + + if (!pDstPix) { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 0; + } + + if (!pSrcPix && pKaaScr->info->UploadToScratch) { + if ((*pKaaScr->info->UploadToScratch) ((PixmapPtr) pSrc->pDrawable, + &srcScratch)) + pSrcPix = &srcScratch; + } + + if (!pSrcPix) { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 0; + } + + if (!(*pKaaScr->info->PrepareBlend) (op, pSrc, pDst, pSrcPix, + pDstPix)) + { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return -1; + } + + nbox = REGION_NUM_RECTS(®ion); + pbox = REGION_RECTS(®ion); + + xSrc -= xDst; + ySrc -= yDst; + + while (nbox--) + { + (*pKaaScr->info->Blend) (pbox->x1 + xSrc + src_off_x, + pbox->y1 + ySrc + src_off_y, + pbox->x1 + dst_off_x, + pbox->y1 + dst_off_y, + pbox->x2 - pbox->x1, + pbox->y2 - pbox->y1); + pbox++; + } + + (*pKaaScr->info->DoneBlend) (); + kaaMarkSync (pDst->pDrawable->pScreen); + kaaDrawableDirty (pDst->pDrawable); + + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 1; +} + +static int +kaaTryDriverComposite(CARD8 op, + PicturePtr pSrc, + PicturePtr pMask, + PicturePtr pDst, + INT16 xSrc, + INT16 ySrc, + INT16 xMask, + INT16 yMask, + INT16 xDst, + INT16 yDst, + CARD16 width, + CARD16 height) +{ + KaaScreenPriv (pDst->pDrawable->pScreen); + RegionRec region; + BoxPtr pbox; + int nbox; + int src_off_x, src_off_y, mask_off_x, mask_off_y, dst_off_x, dst_off_y; + PixmapPtr pSrcPix, pMaskPix = NULL, pDstPix; + struct _Pixmap scratch; + + xDst += pDst->pDrawable->x; + yDst += pDst->pDrawable->y; + + if (pMask) { + xMask += pMask->pDrawable->x; + yMask += pMask->pDrawable->y; + } + + xSrc += pSrc->pDrawable->x; + ySrc += pSrc->pDrawable->y; + + if (!miComputeCompositeRegion (®ion, pSrc, pMask, pDst, + xSrc, ySrc, xMask, yMask, xDst, yDst, + width, height)) + return 1; + + if (pKaaScr->info->CheckComposite && + !(*pKaaScr->info->CheckComposite) (op, pSrc, pMask, pDst)) + { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return -1; + } + + if (pSrc->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pSrc->pDrawable); + if (pMask && pMask->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pMask->pDrawable); + if (pDst->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseScreen ((PixmapPtr) pDst->pDrawable); + + pSrcPix = kaaGetOffscreenPixmap (pSrc->pDrawable, &src_off_x, &src_off_y); + if (pMask) + pMaskPix = kaaGetOffscreenPixmap (pMask->pDrawable, &mask_off_x, + &mask_off_y); + pDstPix = kaaGetOffscreenPixmap (pDst->pDrawable, &dst_off_x, &dst_off_y); + + if (!pDstPix) { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 0; + } + + if (!pSrcPix && (!pMask || pMaskPix) && pKaaScr->info->UploadToScratch) { + if (pSrc->pDrawable->type == DRAWABLE_WINDOW) + pSrcPix = (*pSrc->pDrawable->pScreen->GetWindowPixmap) ( + (WindowPtr) pSrc->pDrawable); + else + pSrcPix = (PixmapPtr) pSrc->pDrawable; + if ((*pKaaScr->info->UploadToScratch) (pSrcPix, &scratch)) + pSrcPix = &scratch; + } else if (pSrcPix && pMask && !pMaskPix && pKaaScr->info->UploadToScratch) { + if (pMask->pDrawable->type == DRAWABLE_WINDOW) + pMaskPix = (*pMask->pDrawable->pScreen->GetWindowPixmap) ( + (WindowPtr) pMask->pDrawable); + else + pMaskPix = (PixmapPtr) pMask->pDrawable; + if ((*pKaaScr->info->UploadToScratch) (pMaskPix, &scratch)) + pMaskPix = &scratch; + } + + if (!pSrcPix || (pMask && !pMaskPix)) { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 0; + } + + if (!(*pKaaScr->info->PrepareComposite) (op, pSrc, pMask, pDst, pSrcPix, + pMaskPix, pDstPix)) + { + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return -1; + } + + nbox = REGION_NUM_RECTS(®ion); + pbox = REGION_RECTS(®ion); + + xMask -= xDst; + yMask -= yDst; + + xSrc -= xDst; + ySrc -= yDst; + + while (nbox--) + { + (*pKaaScr->info->Composite) (pbox->x1 + xSrc + src_off_x, + pbox->y1 + ySrc + src_off_y, + pbox->x1 + xMask + mask_off_x, + pbox->y1 + yMask + mask_off_y, + pbox->x1 + dst_off_x, + pbox->y1 + dst_off_y, + pbox->x2 - pbox->x1, + pbox->y2 - pbox->y1); + pbox++; + } + + (*pKaaScr->info->DoneComposite) (); + kaaMarkSync (pDst->pDrawable->pScreen); + kaaDrawableDirty (pDst->pDrawable); + + REGION_UNINIT(pDst->pDrawable->pScreen, ®ion); + return 1; +} + + +void +kaaComposite(CARD8 op, + PicturePtr pSrc, + PicturePtr pMask, + PicturePtr pDst, + INT16 xSrc, + INT16 ySrc, + INT16 xMask, + INT16 yMask, + INT16 xDst, + INT16 yDst, + CARD16 width, + CARD16 height) +{ + KdScreenPriv (pDst->pDrawable->pScreen); + KaaScreenPriv (pDst->pDrawable->pScreen); + int ret = -1; + + if (!pMask && pSrc->pDrawable) + { + if (op == PictOpSrc) + { + if (pScreenPriv->enabled && pSrc->pDrawable && pSrc->pDrawable->width == 1 && + pSrc->pDrawable->height == 1 && pSrc->repeat) + { + ret = kaaTryDriverSolidFill(pSrc, pDst, xSrc, ySrc, xDst, yDst, + width, height); + if (ret == 1) + return; + } + else if (!pSrc->repeat && !pSrc->transform && + pSrc->format == pDst->format) + { + RegionRec region; + + xDst += pDst->pDrawable->x; + yDst += pDst->pDrawable->y; + xSrc += pSrc->pDrawable->x; + ySrc += pSrc->pDrawable->y; + + if (!miComputeCompositeRegion (®ion, pSrc, pMask, pDst, + xSrc, ySrc, xMask, yMask, xDst, + yDst, width, height)) + return; + + + kaaCopyNtoN (pSrc->pDrawable, pDst->pDrawable, 0, + REGION_RECTS(®ion), REGION_NUM_RECTS(®ion), + xSrc - xDst, ySrc - yDst, + FALSE, FALSE, 0, 0); + return; + } + } + + if (pScreenPriv->enabled && pKaaScr->info->PrepareBlend && + !pSrc->alphaMap && !pDst->alphaMap) + { + ret = kaaTryDriverBlend(op, pSrc, pDst, xSrc, ySrc, xDst, yDst, + width, height); + if (ret == 1) + return; + } + } + + if (pSrc->pDrawable && (!pMask || pMask->pDrawable) && + pScreenPriv->enabled && pKaaScr->info->PrepareComposite && + !pSrc->alphaMap && (!pMask || !pMask->alphaMap) && !pDst->alphaMap) + { + ret = kaaTryDriverComposite(op, pSrc, pMask, pDst, xSrc, ySrc, xMask, + yMask, xDst, yDst, width, height); + if (ret == 1) + return; + } + + if (ret != 0) { + /* failure to accelerate was not due to pixmaps being in the wrong + * locations. + */ + if (pSrc->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseMemory ((PixmapPtr) pSrc->pDrawable); + if (pMask && pMask->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseMemory ((PixmapPtr) pMask->pDrawable); + if (pDst->pDrawable->type == DRAWABLE_PIXMAP) + kaaPixmapUseMemory ((PixmapPtr) pDst->pDrawable); + } + +#if KAA_DEBUG_FALLBACKS + kaaPrintCompositeFallback (op, pSrc, pMask, pDst); +#endif + + KdCheckComposite (op, pSrc, pMask, pDst, xSrc, ySrc, + xMask, yMask, xDst, yDst, width, height); +} +#endif + +static xFixed +miLineFixedX (xLineFixed *l, xFixed y, Bool ceil) +{ + xFixed dx = l->p2.x - l->p1.x; + xFixed_32_32 ex = (xFixed_32_32) (y - l->p1.y) * dx; + xFixed dy = l->p2.y - l->p1.y; + if (ceil) + ex += (dy - 1); + return l->p1.x + (xFixed) (ex / dy); +} + +/* Need to decide just how much to trim, to maintain translation independence + * when converted to floating point. + */ +#define XFIXED_TO_FLOAT(x) (((float)((x) & 0xffffff00)) / 65536.0) + +/* This is just to allow us to work on the hardware side of the problem while + * waiting for cairo to get a new tesselator. We may not be able to support + * RasterizeTrapezoid at all due to the abutting edges requirement, but it might + * be technically legal if we widened the trap by some epsilon, so that alpha + * values at abutting edges were a little too big and capped at one, rather than + * a little too small and looked bad. + */ +void kaaRasterizeTrapezoid(PicturePtr pDst, + xTrapezoid *trap, + int xoff, + int yoff) +{ + KdScreenPriv (pDst->pDrawable->pScreen); + KaaScreenPriv (pDst->pDrawable->pScreen); + KaaTrapezoid ktrap; + PixmapPtr pPix; + xFixed x1, x2; + + if (!pScreenPriv->enabled || + !pKaaScr->info->PrepareTrapezoids || + pDst->pDrawable->type != DRAWABLE_PIXMAP || + pDst->alphaMap || pDst->format != PICT_a8) + { + KdCheckRasterizeTrapezoid (pDst, trap, xoff, yoff); +#if KAA_DEBUG_FALLBACKS + kaaPrintTrapezoidFallback (pDst); +#endif + return; + } + pPix = (PixmapPtr)pDst->pDrawable; + + kaaPixmapUseScreen (pPix); + + if (!kaaPixmapIsOffscreen (pPix) || + !(*pKaaScr->info->PrepareTrapezoids) (pDst, pPix)) + { +#if KAA_DEBUG_FALLBACKS + kaaPrintTrapezoidFallback (pDst); +#endif + KdCheckRasterizeTrapezoid (pDst, trap, xoff, yoff); + return; + } + + ktrap.ty = XFIXED_TO_FLOAT(trap->top) + yoff; + x1 = miLineFixedX (&trap->left, trap->top, FALSE); + x2 = miLineFixedX (&trap->right, trap->top, TRUE); + ktrap.tl = XFIXED_TO_FLOAT(x1) + xoff; + ktrap.tr = XFIXED_TO_FLOAT(x2) + xoff; + ktrap.by = XFIXED_TO_FLOAT(trap->bottom) + yoff; + x1 = miLineFixedX (&trap->left, trap->bottom, FALSE); + x2 = miLineFixedX (&trap->right, trap->bottom, TRUE); + ktrap.bl = XFIXED_TO_FLOAT(x1) + xoff; + ktrap.br = XFIXED_TO_FLOAT(x2) + xoff; + + (*pKaaScr->info->Trapezoids) (&ktrap, 1); + (*pKaaScr->info->DoneTrapezoids) (); +} + +void +kaaInitTrapOffsets(int grid_order, float *x_offsets, float *y_offsets, + float x_offset, float y_offset) +{ + int i = 0; + float x, y, x_count, y_count; + + x_count = (1 << (grid_order / 2)) + 1; + y_count = (1 << (grid_order / 2)) - 1; + + x_offset += 1.0 / x_count / 2.0; + y_offset += 1.0 / y_count / 2.0; + + for (x = 0; x < x_count; x++) { + for (y = 0; y < y_count; y++) { + x_offsets[i] = x / x_count + x_offset; + y_offsets[i] = y / y_count + y_offset; + i++; + } + } +} + |