/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* @file
*
* WGL_ARB_pixel_format extension implementation.
*
* @sa http://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt
*/
#include <windows.h>
#define WGL_WGLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/wglext.h>
#include "pipe/p_compiler.h"
#include "util/u_format.h"
#include "util/u_memory.h"
#include "stw_device.h"
#include "stw_pixelformat.h"
static boolean
stw_query_attrib(
int iPixelFormat,
int iLayerPlane,
int attrib,
int *pvalue )
{
uint count;
const struct stw_pixelformat_info *pfi;
count = stw_pixelformat_get_extended_count();
if (attrib == WGL_NUMBER_PIXEL_FORMATS_ARB) {
*pvalue = (int) count;
return TRUE;
}
pfi = stw_pixelformat_get_info( iPixelFormat );
if (!pfi) {
return FALSE;
}
switch (attrib) {
case WGL_DRAW_TO_WINDOW_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_DRAW_TO_WINDOW ? TRUE : FALSE;
return TRUE;
case WGL_DRAW_TO_BITMAP_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_DRAW_TO_BITMAP ? TRUE : FALSE;
return TRUE;
case WGL_NEED_PALETTE_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_NEED_PALETTE ? TRUE : FALSE;
return TRUE;
case WGL_NEED_SYSTEM_PALETTE_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_NEED_SYSTEM_PALETTE ? TRUE : FALSE;
return TRUE;
case WGL_SWAP_METHOD_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_SWAP_COPY ? WGL_SWAP_COPY_ARB : WGL_SWAP_UNDEFINED_ARB;
return TRUE;
case WGL_SWAP_LAYER_BUFFERS_ARB:
*pvalue = FALSE;
return TRUE;
case WGL_NUMBER_OVERLAYS_ARB:
*pvalue = 0;
return TRUE;
case WGL_NUMBER_UNDERLAYS_ARB:
*pvalue = 0;
return TRUE;
}
if (iLayerPlane != 0)
return FALSE;
switch (attrib) {
case WGL_ACCELERATION_ARB:
*pvalue = WGL_FULL_ACCELERATION_ARB;
break;
case WGL_TRANSPARENT_ARB:
*pvalue = FALSE;
break;
case WGL_TRANSPARENT_RED_VALUE_ARB:
case WGL_TRANSPARENT_GREEN_VALUE_ARB:
case WGL_TRANSPARENT_BLUE_VALUE_ARB:
case WGL_TRANSPARENT_ALPHA_VALUE_ARB:
case WGL_TRANSPARENT_INDEX_VALUE_ARB:
break;
case WGL_SHARE_DEPTH_ARB:
case WGL_SHARE_STENCIL_ARB:
case WGL_SHARE_ACCUM_ARB:
*pvalue = TRUE;
break;
case WGL_SUPPORT_GDI_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_SUPPORT_GDI ? TRUE : FALSE;
break;
case WGL_SUPPORT_OPENGL_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_SUPPORT_OPENGL ? TRUE : FALSE;
break;
case WGL_DOUBLE_BUFFER_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_DOUBLEBUFFER ? TRUE : FALSE;
break;
case WGL_STEREO_ARB:
*pvalue = pfi->pfd.dwFlags & PFD_STEREO ? TRUE : FALSE;
break;
case WGL_PIXEL_TYPE_ARB:
switch (pfi->pfd.iPixelType) {
case PFD_TYPE_RGBA:
if (util_format_is_float(pfi->stvis.color_format)) {
*pvalue = WGL_TYPE_RGBA_FLOAT_ARB;
}
else {
*pvalue = WGL_TYPE_RGBA_ARB;
}
break;
case PFD_TYPE_COLORINDEX:
*pvalue = WGL_TYPE_COLORINDEX_ARB;
break;
default:
return FALSE;
}
break;
case WGL_COLOR_BITS_ARB:
*pvalue = pfi->pfd.cColorBits;
break;
case WGL_RED_BITS_ARB:
*pvalue = pfi->pfd.cRedBits;
break;
case WGL_RED_SHIFT_ARB:
*pvalue = pfi->pfd.cRedShift;
break;
case WGL_GREEN_BITS_ARB:
*pvalue = pfi->pfd.cGreenBits;
break;
case WGL_GREEN_SHIFT_ARB:
*pvalue = pfi->pfd.cGreenShift;
break;
case WGL_BLUE_BITS_ARB:
*pvalue = pfi->pfd.cBlueBits;
break;
case WGL_BLUE_SHIFT_ARB:
*pvalue = pfi->pfd.cBlueShift;
break;
case WGL_ALPHA_BITS_ARB:
*pvalue = pfi->pfd.cAlphaBits;
break;
case WGL_ALPHA_SHIFT_ARB:
*pvalue = pfi->pfd.cAlphaShift;
break;
case WGL_ACCUM_BITS_ARB:
*pvalue = pfi->pfd.cAccumBits;
break;
case WGL_ACCUM_RED_BITS_ARB:
*pvalue = pfi->pfd.cAccumRedBits;
break;
case WGL_ACCUM_GREEN_BITS_ARB:
*pvalue = pfi->pfd.cAccumGreenBits;
break;
case WGL_ACCUM_BLUE_BITS_ARB:
*pvalue = pfi->pfd.cAccumBlueBits;
break;
case WGL_ACCUM_ALPHA_BITS_ARB:
*pvalue = pfi->pfd.cAccumAlphaBits;
break;
case WGL_DEPTH_BITS_ARB:
*pvalue = pfi->pfd.cDepthBits;
break;
case WGL_STENCIL_BITS_ARB:
*pvalue = pfi->pfd.cStencilBits;
break;
case WGL_AUX_BUFFERS_ARB:
*pvalue = pfi->pfd.cAuxBuffers;
break;
case WGL_SAMPLE_BUFFERS_ARB:
*pvalue = 1;
break;
case WGL_SAMPLES_ARB:
*pvalue = pfi->stvis.samples;
break;
/* WGL_ARB_pbuffer */
case WGL_MAX_PBUFFER_WIDTH_ARB:
case WGL_MAX_PBUFFER_HEIGHT_ARB:
*pvalue = stw_dev->max_2d_length;
break;
case WGL_MAX_PBUFFER_PIXELS_ARB:
*pvalue = stw_dev->max_2d_length * stw_dev->max_2d_length;
break;
case WGL_DRAW_TO_PBUFFER_ARB:
*pvalue = 1;
break;
default:
return FALSE;
}
return TRUE;
}
struct attrib_match_info
{
int attribute;
int weight;
BOOL exact;
};
static const struct attrib_match_info attrib_match[] = {
/* WGL_ARB_pixel_format */
{ WGL_DRAW_TO_WINDOW_ARB, 0, TRUE },
{ WGL_DRAW_TO_BITMAP_ARB, 0, TRUE },
{ WGL_ACCELERATION_ARB, 0, TRUE },
{ WGL_NEED_PALETTE_ARB, 0, TRUE },
{ WGL_NEED_SYSTEM_PALETTE_ARB, 0, TRUE },
{ WGL_SWAP_LAYER_BUFFERS_ARB, 0, TRUE },
{ WGL_SWAP_METHOD_ARB, 0, TRUE },
{ WGL_NUMBER_OVERLAYS_ARB, 4, FALSE },
{ WGL_NUMBER_UNDERLAYS_ARB, 4, FALSE },
/*{ WGL_SHARE_DEPTH_ARB, 0, TRUE },*/ /* no overlays -- ignore */
/*{ WGL_SHARE_STENCIL_ARB, 0, TRUE },*/ /* no overlays -- ignore */
/*{ WGL_SHARE_ACCUM_ARB, 0, TRUE },*/ /* no overlays -- ignore */
{ WGL_SUPPORT_GDI_ARB, 0, TRUE },
{ WGL_SUPPORT_OPENGL_ARB, 0, TRUE },
{ WGL_DOUBLE_BUFFER_ARB, 0, TRUE },
{ WGL_STEREO_ARB, 0, TRUE },
{ WGL_PIXEL_TYPE_ARB, 0, TRUE },
{ WGL_COLOR_BITS_ARB, 1, FALSE },
{ WGL_RED_BITS_ARB, 1, FALSE },
{ WGL_GREEN_BITS_ARB, 1, FALSE },
{ WGL_BLUE_BITS_ARB, 1, FALSE },
{ WGL_ALPHA_BITS_ARB, 1, FALSE },
{ WGL_ACCUM_BITS_ARB, 1, FALSE },
{ WGL_ACCUM_RED_BITS_ARB, 1, FALSE },
{ WGL_ACCUM_GREEN_BITS_ARB, 1, FALSE },
{ WGL_ACCUM_BLUE_BITS_ARB, 1, FALSE },
{ WGL_ACCUM_ALPHA_BITS_ARB, 1, FALSE },
{ WGL_DEPTH_BITS_ARB, 1, FALSE },
{ WGL_STENCIL_BITS_ARB, 1, FALSE },
{ WGL_AUX_BUFFERS_ARB, 2, FALSE },
/* WGL_ARB_multisample */
{ WGL_SAMPLE_BUFFERS_ARB, 2, FALSE },
{ WGL_SAMPLES_ARB, 2, FALSE }
};
struct stw_pixelformat_score
{
int points;
uint index;
};
static BOOL
score_pixelformats(
struct stw_pixelformat_score *scores,
uint count,
int attribute,
int expected_value )
{
uint i;
const struct attrib_match_info *ami = NULL;
uint index;
/* Find out if a given attribute should be considered for score calculation.
*/
for (i = 0; i < sizeof( attrib_match ) / sizeof( attrib_match[0] ); i++) {
if (attrib_match[i].attribute == attribute) {
ami = &attrib_match[i];
break;
}
}
if (ami == NULL)
return TRUE;
/* Iterate all pixelformats, query the requested attribute and calculate
* score points.
*/
for (index = 0; index < count; index++) {
int actual_value;
if (!stw_query_attrib( index + 1, 0, attribute, &actual_value ))
return FALSE;
if (ami->exact) {
/* For an exact match criteria, if the actual and expected values differ,
* the score is set to 0 points, effectively removing the pixelformat
* from a list of matching pixelformats.
*/
if (actual_value != expected_value)
scores[index].points = 0;
}
else {
/* For a minimum match criteria, if the actual value is smaller than the expected
* value, the pixelformat is rejected (score set to 0). However, if the actual
* value is bigger, the pixelformat is given a penalty to favour pixelformats that
* more closely match the expected values.
*/
if (actual_value < expected_value)
scores[index].points = 0;
else if (actual_value > expected_value)
scores[index].points -= (actual_value - expected_value) * ami->weight;
}
}
return TRUE;
}
WINGDIAPI BOOL APIENTRY
wglChoosePixelFormatARB(
HDC hdc,
const int *piAttribIList,
const FLOAT *pfAttribFList,
UINT nMaxFormats,
int *piFormats,
UINT *nNumFormats )
{
uint count;
struct stw_pixelformat_score *scores;
uint i;
*nNumFormats = 0;
/* Allocate and initialize pixelformat score table -- better matches
* have higher scores. Start with a high score and take out penalty
* points for a mismatch when the match does not have to be exact.
* Set a score to 0 if there is a mismatch for an exact match criteria.
*/
count = stw_pixelformat_get_extended_count();
scores = (struct stw_pixelformat_score *) MALLOC( count * sizeof( struct stw_pixelformat_score ) );
if (scores == NULL)
return FALSE;
for (i = 0; i < count; i++) {
scores[i].points = 0x7fffffff;
scores[i].index = i;
}
/* Given the attribute list calculate a score for each pixelformat.
*/
if (piAttribIList != NULL) {
while (*piAttribIList != 0) {
if (!score_pixelformats( scores, count, piAttribIList[0], piAttribIList[1] )) {
FREE( scores );
return FALSE;
}
piAttribIList += 2;
}
}
if (pfAttribFList != NULL) {
while (*pfAttribFList != 0) {
if (!score_pixelformats( scores, count, (int) pfAttribFList[0], (int) pfAttribFList[1] )) {
FREE( scores );
return FALSE;
}
pfAttribFList += 2;
}
}
/* Bubble-sort the resulting scores. Pixelformats with higher scores go first.
* TODO: Find out if there are any patent issues with it.
*/
if (count > 1) {
uint n = count;
boolean swapped;
do {
swapped = FALSE;
for (i = 1; i < n; i++) {
if (scores[i - 1].points < scores[i].points) {
struct stw_pixelformat_score score = scores[i - 1];
scores[i - 1] = scores[i];
scores[i] = score;
swapped = TRUE;
}
}
n--;
}
while (swapped);
}
/* Return a list of pixelformats that are the best match.
* Reject pixelformats with non-positive scores.
*/
for (i = 0; i < count; i++) {
if (scores[i].points > 0) {
if (*nNumFormats < nMaxFormats)
piFormats[*nNumFormats] = scores[i].index + 1;
(*nNumFormats)++;
}
}
FREE( scores );
return TRUE;
}
WINGDIAPI BOOL APIENTRY
wglGetPixelFormatAttribfvARB(
HDC hdc,
int iPixelFormat,
int iLayerPlane,
UINT nAttributes,
const int *piAttributes,
FLOAT *pfValues )
{
UINT i;
(void) hdc;
for (i = 0; i < nAttributes; i++) {
int value;
if (!stw_query_attrib( iPixelFormat, iLayerPlane, piAttributes[i], &value ))
return FALSE;
pfValues[i] = (FLOAT) value;
}
return TRUE;
}
WINGDIAPI BOOL APIENTRY
wglGetPixelFormatAttribivARB(
HDC hdc,
int iPixelFormat,
int iLayerPlane,
UINT nAttributes,
const int *piAttributes,
int *piValues )
{
UINT i;
(void) hdc;
for (i = 0; i < nAttributes; i++) {
if (!stw_query_attrib( iPixelFormat, iLayerPlane, piAttributes[i], &piValues[i] ))
return FALSE;
}
return TRUE;
}