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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Authors:
* George Sapountzis <gsap7@yahoo.gr>
*/
#include "swrast_priv.h"
#define YFLIP(_xrb, Y) ((_xrb)->Base.Height - (Y) - 1)
/*
* Dithering support takes the "computation" extreme in the "computation vs.
* storage" trade-off. This approach is very simple to implement and any
* computational overhead should be acceptable. XMesa uses table lookups for
* around 8KB of storage overhead per visual.
*/
#define DITHER 1
static const GLubyte kernel[16] = {
0*16, 8*16, 2*16, 10*16,
12*16, 4*16, 14*16, 6*16,
3*16, 11*16, 1*16, 9*16,
15*16, 7*16, 13*16, 5*16,
};
#if DITHER
#define DITHER_COMP(X, Y) kernel[((X) & 0x3) | (((Y) & 0x3) << 2)]
#define DITHER_CLAMP(X) (((X) < CHAN_MAX) ? (X) : CHAN_MAX)
#else
#define DITHER_COMP(X, Y) 0
#define DITHER_CLAMP(X) (X)
#endif
/*
* Pixel macros shared across front/back buffer span functions.
*/
/* 32-bit BGRA */
#define STORE_PIXEL_A8R8G8B8(DST, X, Y, VALUE) \
DST[3] = VALUE[ACOMP]; \
DST[2] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[0] = VALUE[BCOMP]
#define STORE_PIXEL_RGB_A8R8G8B8(DST, X, Y, VALUE) \
DST[3] = 0xff; \
DST[2] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[0] = VALUE[BCOMP]
#define FETCH_PIXEL_A8R8G8B8(DST, SRC) \
DST[ACOMP] = SRC[3]; \
DST[RCOMP] = SRC[2]; \
DST[GCOMP] = SRC[1]; \
DST[BCOMP] = SRC[0]
/* 16-bit BGR */
#define STORE_PIXEL_R5G6B5(DST, X, Y, VALUE) \
do { \
int d = DITHER_COMP(X, Y) >> 6; \
GLushort *p = (GLushort *)DST; \
*p = ( ((DITHER_CLAMP((VALUE[RCOMP]) + d) & 0xf8) << 8) | \
((DITHER_CLAMP((VALUE[GCOMP]) + d) & 0xfc) << 3) | \
((DITHER_CLAMP((VALUE[BCOMP]) + d) & 0xf8) >> 3) ); \
} while(0)
#define FETCH_PIXEL_R5G6B5(DST, SRC) \
do { \
GLushort p = *(GLushort *)SRC; \
DST[ACOMP] = 0xff; \
DST[RCOMP] = ((p >> 8) & 0xf8) * 255 / 0xf8; \
DST[GCOMP] = ((p >> 3) & 0xfc) * 255 / 0xfc; \
DST[BCOMP] = ((p << 3) & 0xf8) * 255 / 0xf8; \
} while(0)
/* 8-bit BGR */
#define STORE_PIXEL_R3G3B2(DST, X, Y, VALUE) \
do { \
int d = DITHER_COMP(X, Y) >> 3; \
GLubyte *p = (GLubyte *)DST; \
*p = ( ((DITHER_CLAMP((VALUE[RCOMP]) + d) & 0xe0) >> 5) | \
((DITHER_CLAMP((VALUE[GCOMP]) + d) & 0xe0) >> 2) | \
((DITHER_CLAMP((VALUE[BCOMP]) + d) & 0xc0) >> 0) ); \
} while(0)
#define FETCH_PIXEL_R3G3B2(DST, SRC) \
do { \
GLubyte p = *(GLubyte *)SRC; \
DST[ACOMP] = 0xff; \
DST[RCOMP] = ((p << 5) & 0xe0) * 255 / 0xe0; \
DST[GCOMP] = ((p << 2) & 0xe0) * 255 / 0xe0; \
DST[BCOMP] = ((p << 0) & 0xc0) * 255 / 0xc0; \
} while(0)
/*
* Generate code for back-buffer span functions.
*/
/* 32-bit BGRA */
#define NAME(FUNC) FUNC##_A8R8G8B8
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)xrb->Base.Data + YFLIP(xrb, Y) * xrb->pitch + (X) * 4;
#define INC_PIXEL_PTR(P) P += 4
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_A8R8G8B8(DST, X, Y, VALUE)
#define STORE_PIXEL_RGB(DST, X, Y, VALUE) \
STORE_PIXEL_RGB_A8R8G8B8(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_A8R8G8B8(DST, SRC)
#include "swrast/s_spantemp.h"
/* 16-bit BGR */
#define NAME(FUNC) FUNC##_R5G6B5
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)xrb->Base.Data + YFLIP(xrb, Y) * xrb->pitch + (X) * 2;
#define INC_PIXEL_PTR(P) P += 2
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_R5G6B5(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_R5G6B5(DST, SRC)
#include "swrast/s_spantemp.h"
/* 8-bit BGR */
#define NAME(FUNC) FUNC##_R3G3B2
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)xrb->Base.Data + YFLIP(xrb, Y) * xrb->pitch + (X) * 1;
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_R3G3B2(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_R3G3B2(DST, SRC)
#include "swrast/s_spantemp.h"
/* 8-bit color index */
#define NAME(FUNC) FUNC##_CI8
#define CI_MODE
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)xrb->Base.Data + YFLIP(xrb, Y) * xrb->pitch + (X);
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
*DST = VALUE[0]
#define FETCH_PIXEL(DST, SRC) \
DST = SRC[0]
#include "swrast/s_spantemp.h"
/*
* Generate code for front-buffer span functions.
*/
/* 32-bit BGRA */
#define NAME(FUNC) FUNC##_A8R8G8B8_front
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)row;
#define INC_PIXEL_PTR(P) P += 4
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_A8R8G8B8(DST, X, Y, VALUE)
#define STORE_PIXEL_RGB(DST, X, Y, VALUE) \
STORE_PIXEL_RGB_A8R8G8B8(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_A8R8G8B8(DST, SRC)
#include "swrast_spantemp.h"
/* 16-bit BGR */
#define NAME(FUNC) FUNC##_R5G6B5_front
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)row;
#define INC_PIXEL_PTR(P) P += 2
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_R5G6B5(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_R5G6B5(DST, SRC)
#include "swrast_spantemp.h"
/* 8-bit BGR */
#define NAME(FUNC) FUNC##_R3G3B2_front
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)row;
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
STORE_PIXEL_R3G3B2(DST, X, Y, VALUE)
#define FETCH_PIXEL(DST, SRC) \
FETCH_PIXEL_R3G3B2(DST, SRC)
#include "swrast_spantemp.h"
/* 8-bit color index */
#define NAME(FUNC) FUNC##_CI8_front
#define CI_MODE
#define RB_TYPE GLubyte
#define SPAN_VARS \
struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = (GLubyte *)row;
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
*DST = VALUE[0]
#define FETCH_PIXEL(DST, SRC) \
DST = SRC[0]
#include "swrast_spantemp.h"
/*
* Back-buffers are malloced memory and always private.
*
* BACK_PIXMAP (not supported)
* BACK_XIMAGE
*/
void
swrast_set_span_funcs_back(struct swrast_renderbuffer *xrb,
GLuint pixel_format)
{
switch (pixel_format) {
case PF_A8R8G8B8:
xrb->Base.GetRow = get_row_A8R8G8B8;
xrb->Base.GetValues = get_values_A8R8G8B8;
xrb->Base.PutRow = put_row_A8R8G8B8;
xrb->Base.PutRowRGB = put_row_rgb_A8R8G8B8;
xrb->Base.PutMonoRow = put_mono_row_A8R8G8B8;
xrb->Base.PutValues = put_values_A8R8G8B8;
xrb->Base.PutMonoValues = put_mono_values_A8R8G8B8;
break;
case PF_R5G6B5:
xrb->Base.GetRow = get_row_R5G6B5;
xrb->Base.GetValues = get_values_R5G6B5;
xrb->Base.PutRow = put_row_R5G6B5;
xrb->Base.PutRowRGB = put_row_rgb_R5G6B5;
xrb->Base.PutMonoRow = put_mono_row_R5G6B5;
xrb->Base.PutValues = put_values_R5G6B5;
xrb->Base.PutMonoValues = put_mono_values_R5G6B5;
break;
case PF_R3G3B2:
xrb->Base.GetRow = get_row_R3G3B2;
xrb->Base.GetValues = get_values_R3G3B2;
xrb->Base.PutRow = put_row_R3G3B2;
xrb->Base.PutRowRGB = put_row_rgb_R3G3B2;
xrb->Base.PutMonoRow = put_mono_row_R3G3B2;
xrb->Base.PutValues = put_values_R3G3B2;
xrb->Base.PutMonoValues = put_mono_values_R3G3B2;
break;
case PF_CI8:
xrb->Base.GetRow = get_row_CI8;
xrb->Base.GetValues = get_values_CI8;
xrb->Base.PutRow = put_row_CI8;
xrb->Base.PutMonoRow = put_mono_row_CI8;
xrb->Base.PutValues = put_values_CI8;
xrb->Base.PutMonoValues = put_mono_values_CI8;
break;
default:
assert(0);
return;
}
}
/*
* Front-buffers are provided by the loader, the xorg loader uses pixmaps.
*
* WINDOW, An X window
* GLXWINDOW, GLX window
* PIXMAP, GLX pixmap
* PBUFFER GLX Pbuffer
*/
void
swrast_set_span_funcs_front(struct swrast_renderbuffer *xrb,
GLuint pixel_format)
{
switch (pixel_format) {
case PF_A8R8G8B8:
xrb->Base.GetRow = get_row_A8R8G8B8_front;
xrb->Base.GetValues = get_values_A8R8G8B8_front;
xrb->Base.PutRow = put_row_A8R8G8B8_front;
xrb->Base.PutRowRGB = put_row_rgb_A8R8G8B8_front;
xrb->Base.PutMonoRow = put_mono_row_A8R8G8B8_front;
xrb->Base.PutValues = put_values_A8R8G8B8_front;
xrb->Base.PutMonoValues = put_mono_values_A8R8G8B8_front;
break;
case PF_R5G6B5:
xrb->Base.GetRow = get_row_R5G6B5_front;
xrb->Base.GetValues = get_values_R5G6B5_front;
xrb->Base.PutRow = put_row_R5G6B5_front;
xrb->Base.PutRowRGB = put_row_rgb_R5G6B5_front;
xrb->Base.PutMonoRow = put_mono_row_R5G6B5_front;
xrb->Base.PutValues = put_values_R5G6B5_front;
xrb->Base.PutMonoValues = put_mono_values_R5G6B5_front;
break;
case PF_R3G3B2:
xrb->Base.GetRow = get_row_R3G3B2_front;
xrb->Base.GetValues = get_values_R3G3B2_front;
xrb->Base.PutRow = put_row_R3G3B2_front;
xrb->Base.PutRowRGB = put_row_rgb_R3G3B2_front;
xrb->Base.PutMonoRow = put_mono_row_R3G3B2_front;
xrb->Base.PutValues = put_values_R3G3B2_front;
xrb->Base.PutMonoValues = put_mono_values_R3G3B2_front;
break;
case PF_CI8:
xrb->Base.GetRow = get_row_CI8_front;
xrb->Base.GetValues = get_values_CI8_front;
xrb->Base.PutRow = put_row_CI8_front;
xrb->Base.PutMonoRow = put_mono_row_CI8_front;
xrb->Base.PutValues = put_values_CI8_front;
xrb->Base.PutMonoValues = put_mono_values_CI8_front;
break;
default:
assert(0);
return;
}
}
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