/**
* Choose the pixel format for the given visual.
* This will tell the gallium driver how to pack pixel data into
* drawing surfaces.
*/
static GLuint
choose_pixel_format(XMesaVisual v)
{
boolean native_byte_order = (host_byte_order() ==
ImageByteOrder(v->display));
if ( GET_REDMASK(v) == 0x0000ff
&& GET_GREENMASK(v) == 0x00ff00
&& GET_BLUEMASK(v) == 0xff0000
&& v->BitsPerPixel == 32) {
if (native_byte_order) {
/* no byteswapping needed */
return PIPE_FORMAT_R8G8B8A8_UNORM;
}
else {
return PIPE_FORMAT_A8B8G8R8_UNORM;
}
}
else if ( GET_REDMASK(v) == 0xff0000
&& GET_GREENMASK(v) == 0x00ff00
&& GET_BLUEMASK(v) == 0x0000ff
&& v->BitsPerPixel == 32) {
if (native_byte_order) {
/* no byteswapping needed */
return PIPE_FORMAT_B8G8R8A8_UNORM;
}
else {
return PIPE_FORMAT_A8R8G8B8_UNORM;
}
}
else if ( GET_REDMASK(v) == 0x0000ff00
&& GET_GREENMASK(v) == 0x00ff0000
&& GET_BLUEMASK(v) == 0xff000000
&& v->BitsPerPixel == 32) {
if (native_byte_order) {
/* no byteswapping needed */
return PIPE_FORMAT_A8R8G8B8_UNORM;
}
else {
return PIPE_FORMAT_B8G8R8A8_UNORM;
}
}
else if ( GET_REDMASK(v) == 0xf800
&& GET_GREENMASK(v) == 0x07e0
&& GET_BLUEMASK(v) == 0x001f
&& native_byte_order
&& v->BitsPerPixel == 16) {
/* 5-6-5 RGB */
return PIPE_FORMAT_B5G6R5_UNORM;
}
return PIPE_FORMAT_NONE;
}
/* Implements glColorMask() */
static void
color_mask(GLcontext *ctx,
GLboolean rmask, GLboolean gmask, GLboolean bmask, GLboolean amask)
{
const XMesaContext xmesa = XMESA_CONTEXT(ctx);
XMesaBuffer xmbuf;
const int xclass = xmesa->xm_visual->mesa_visual.visualType;
(void) amask;
if (ctx->DrawBuffer->Name != 0)
return;
xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
unsigned long m;
if (rmask && gmask && bmask) {
m = ((unsigned long)~0L);
}
else {
m = 0;
if (rmask) m |= GET_REDMASK(xmesa->xm_visual);
if (gmask) m |= GET_GREENMASK(xmesa->xm_visual);
if (bmask) m |= GET_BLUEMASK(xmesa->xm_visual);
}
XMesaSetPlaneMask( xmesa->display, xmbuf->cleargc, m );
XMesaSetPlaneMask( xmesa->display, xmbuf->gc, m );
}
}
/*
* Create a new X/Mesa visual.
* Input: display - X11 display
* visinfo - an XVisualInfo pointer
* rgb_flag - GL_TRUE = RGB mode,
* GL_FALSE = color index mode
* alpha_flag - alpha buffer requested?
* db_flag - GL_TRUE = double-buffered,
* GL_FALSE = single buffered
* stereo_flag - stereo visual?
* ximage_flag - GL_TRUE = use an XImage for back buffer,
* GL_FALSE = use an off-screen pixmap for back buffer
* depth_size - requested bits/depth values, or zero
* stencil_size - requested bits/stencil values, or zero
* accum_red_size - requested bits/red accum values, or zero
* accum_green_size - requested bits/green accum values, or zero
* accum_blue_size - requested bits/blue accum values, or zero
* accum_alpha_size - requested bits/alpha accum values, or zero
* num_samples - number of samples/pixel if multisampling, or zero
* level - visual level, usually 0
* visualCaveat - ala the GLX extension, usually GLX_NONE
* Return; a new XMesaVisual or 0 if error.
*/
PUBLIC
XMesaVisual XMesaCreateVisual( Display *display,
XVisualInfo * visinfo,
GLboolean rgb_flag,
GLboolean alpha_flag,
GLboolean db_flag,
GLboolean stereo_flag,
GLboolean ximage_flag,
GLint depth_size,
GLint stencil_size,
GLint accum_red_size,
GLint accum_green_size,
GLint accum_blue_size,
GLint accum_alpha_size,
GLint num_samples,
GLint level,
GLint visualCaveat )
{
XMesaDisplay xmdpy = xmesa_init_display(display);
XMesaVisual v;
GLint red_bits, green_bits, blue_bits, alpha_bits;
if (!xmdpy)
return NULL;
/* For debugging only */
if (_mesa_getenv("MESA_XSYNC")) {
/* This makes debugging X easier.
* In your debugger, set a breakpoint on _XError to stop when an
* X protocol error is generated.
*/
XSynchronize( display, 1 );
}
v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
if (!v) {
return NULL;
}
v->display = display;
/* Save a copy of the XVisualInfo struct because the user may Xfree()
* the struct but we may need some of the information contained in it
* at a later time.
*/
v->visinfo = (XVisualInfo *) malloc(sizeof(*visinfo));
if (!v->visinfo) {
free(v);
return NULL;
}
memcpy(v->visinfo, visinfo, sizeof(*visinfo));
v->ximage_flag = ximage_flag;
v->mesa_visual.redMask = visinfo->red_mask;
v->mesa_visual.greenMask = visinfo->green_mask;
v->mesa_visual.blueMask = visinfo->blue_mask;
v->visualID = visinfo->visualid;
v->screen = visinfo->screen;
#if !(defined(__cplusplus) || defined(c_plusplus))
v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
#else
v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
#endif
v->mesa_visual.visualRating = visualCaveat;
if (alpha_flag)
v->mesa_visual.alphaBits = 8;
(void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
{
const int xclass = v->visualType;
if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
red_bits = _mesa_bitcount(GET_REDMASK(v));
green_bits = _mesa_bitcount(GET_GREENMASK(v));
blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
}
else {
/* this is an approximation */
int depth;
depth = v->visinfo->depth;
red_bits = depth / 3;
depth -= red_bits;
green_bits = depth / 2;
depth -= green_bits;
blue_bits = depth;
alpha_bits = 0;
assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
}
alpha_bits = v->mesa_visual.alphaBits;
}
/* initialize visual */
{
struct gl_config *vis = &v->mesa_visual;
vis->rgbMode = GL_TRUE;
vis->doubleBufferMode = db_flag;
vis->stereoMode = stereo_flag;
vis->redBits = red_bits;
vis->greenBits = green_bits;
vis->blueBits = blue_bits;
vis->alphaBits = alpha_bits;
vis->rgbBits = red_bits + green_bits + blue_bits;
vis->indexBits = 0;
vis->depthBits = depth_size;
vis->stencilBits = stencil_size;
vis->accumRedBits = accum_red_size;
vis->accumGreenBits = accum_green_size;
vis->accumBlueBits = accum_blue_size;
vis->accumAlphaBits = accum_alpha_size;
vis->haveAccumBuffer = accum_red_size > 0;
vis->haveDepthBuffer = depth_size > 0;
vis->haveStencilBuffer = stencil_size > 0;
vis->numAuxBuffers = 0;
vis->level = 0;
vis->sampleBuffers = 0;
vis->samples = 0;
}
v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
if (db_flag)
v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
if (stereo_flag) {
v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
if (db_flag)
v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
}
v->stvis.color_format = choose_pixel_format(v);
if (v->stvis.color_format == PIPE_FORMAT_NONE) {
free(v->visinfo);
free(v);
return NULL;
}
v->stvis.depth_stencil_format =
choose_depth_stencil_format(xmdpy, depth_size, stencil_size);
v->stvis.accum_format = (accum_red_size +
accum_green_size + accum_blue_size + accum_alpha_size) ?
PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
v->stvis.samples = num_samples;
v->stvis.render_buffer = ST_ATTACHMENT_INVALID;
/* XXX minor hack */
v->mesa_visual.level = level;
return v;
}
/*
* Create a new X/Mesa visual.
* Input: display - X11 display
* visinfo - an XVisualInfo pointer
* rgb_flag - GL_TRUE = RGB mode,
* GL_FALSE = color index mode
* alpha_flag - alpha buffer requested?
* db_flag - GL_TRUE = double-buffered,
* GL_FALSE = single buffered
* stereo_flag - stereo visual?
* ximage_flag - GL_TRUE = use an XImage for back buffer,
* GL_FALSE = use an off-screen pixmap for back buffer
* depth_size - requested bits/depth values, or zero
* stencil_size - requested bits/stencil values, or zero
* accum_red_size - requested bits/red accum values, or zero
* accum_green_size - requested bits/green accum values, or zero
* accum_blue_size - requested bits/blue accum values, or zero
* accum_alpha_size - requested bits/alpha accum values, or zero
* num_samples - number of samples/pixel if multisampling, or zero
* level - visual level, usually 0
* visualCaveat - ala the GLX extension, usually GLX_NONE
* Return; a new XMesaVisual or 0 if error.
*/
PUBLIC
XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
XMesaVisualInfo visinfo,
GLboolean rgb_flag,
GLboolean alpha_flag,
GLboolean db_flag,
GLboolean stereo_flag,
GLboolean ximage_flag,
GLint depth_size,
GLint stencil_size,
GLint accum_red_size,
GLint accum_green_size,
GLint accum_blue_size,
GLint accum_alpha_size,
GLint num_samples,
GLint level,
GLint visualCaveat )
{
char *gamma;
XMesaVisual v;
GLint red_bits, green_bits, blue_bits, alpha_bits;
/* For debugging only */
if (_mesa_getenv("MESA_XSYNC")) {
/* This makes debugging X easier.
* In your debugger, set a breakpoint on _XError to stop when an
* X protocol error is generated.
*/
XSynchronize( display, 1 );
}
/* Color-index rendering not supported. */
if (!rgb_flag)
return NULL;
v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
if (!v) {
return NULL;
}
v->display = display;
/* Save a copy of the XVisualInfo struct because the user may Xfree()
* the struct but we may need some of the information contained in it
* at a later time.
*/
v->visinfo = (XVisualInfo *) malloc(sizeof(*visinfo));
if(!v->visinfo) {
free(v);
return NULL;
}
memcpy(v->visinfo, visinfo, sizeof(*visinfo));
/* check for MESA_GAMMA environment variable */
gamma = _mesa_getenv("MESA_GAMMA");
if (gamma) {
v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
if (v->RedGamma<=0.0) v->RedGamma = 1.0;
if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
}
else {
v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
}
v->ximage_flag = ximage_flag;
v->mesa_visual.redMask = visinfo->red_mask;
v->mesa_visual.greenMask = visinfo->green_mask;
v->mesa_visual.blueMask = visinfo->blue_mask;
v->visualID = visinfo->visualid;
v->screen = visinfo->screen;
#if !(defined(__cplusplus) || defined(c_plusplus))
v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
#else
v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
#endif
v->mesa_visual.visualRating = visualCaveat;
if (alpha_flag)
v->mesa_visual.alphaBits = 8;
(void) initialize_visual_and_buffer( v, NULL, 0, 0 );
{
const int xclass = v->visualType;
if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
red_bits = _mesa_bitcount(GET_REDMASK(v));
green_bits = _mesa_bitcount(GET_GREENMASK(v));
blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
}
else {
/* this is an approximation */
int depth;
depth = GET_VISUAL_DEPTH(v);
red_bits = depth / 3;
depth -= red_bits;
green_bits = depth / 2;
depth -= green_bits;
blue_bits = depth;
alpha_bits = 0;
assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
}
alpha_bits = v->mesa_visual.alphaBits;
}
if (!_mesa_initialize_visual(&v->mesa_visual,
db_flag, stereo_flag,
red_bits, green_bits,
blue_bits, alpha_bits,
depth_size,
stencil_size,
accum_red_size, accum_green_size,
accum_blue_size, accum_alpha_size,
0)) {
FREE(v);
return NULL;
}
/* XXX minor hack */
v->mesa_visual.level = level;
return v;
}
/**
* Setup RGB rendering for a window with a True/DirectColor visual.
*/
static void
setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
{
unsigned long rmask, gmask, bmask;
(void) buffer;
(void) cmap;
/* Compute red multiplier (mask) and bit shift */
v->rshift = 0;
rmask = GET_REDMASK(v);
while ((rmask & 1)==0) {
v->rshift++;
rmask = rmask >> 1;
}
/* Compute green multiplier (mask) and bit shift */
v->gshift = 0;
gmask = GET_GREENMASK(v);
while ((gmask & 1)==0) {
v->gshift++;
gmask = gmask >> 1;
}
/* Compute blue multiplier (mask) and bit shift */
v->bshift = 0;
bmask = GET_BLUEMASK(v);
while ((bmask & 1)==0) {
v->bshift++;
bmask = bmask >> 1;
}
/*
* Compute component-to-pixel lookup tables and dithering kernel
*/
{
static 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,
};
GLint rBits = _mesa_bitcount(rmask);
GLint gBits = _mesa_bitcount(gmask);
GLint bBits = _mesa_bitcount(bmask);
GLint maxBits;
GLuint i;
/* convert pixel components in [0,_mask] to RGB values in [0,255] */
for (i=0; i<=rmask; i++)
v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
for (i=0; i<=gmask; i++)
v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
for (i=0; i<=bmask; i++)
v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
/* convert RGB values from [0,255] to pixel components */
for (i=0;i<256;i++) {
GLint r = gamma_adjust(v->RedGamma, i, 255);
GLint g = gamma_adjust(v->GreenGamma, i, 255);
GLint b = gamma_adjust(v->BlueGamma, i, 255);
v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
}
/* overflow protection */
for (i=256;i<512;i++) {
v->RtoPixel[i] = v->RtoPixel[255];
v->GtoPixel[i] = v->GtoPixel[255];
v->BtoPixel[i] = v->BtoPixel[255];
}
/* setup dithering kernel */
maxBits = rBits;
if (gBits > maxBits) maxBits = gBits;
if (bBits > maxBits) maxBits = bBits;
for (i=0;i<16;i++) {
v->Kernel[i] = kernel[i] >> maxBits;
}
v->undithered_pf = PF_Truecolor;
v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
}
/*
* Now check for TrueColor visuals which we can optimize.
*/
if ( GET_REDMASK(v) ==0x0000ff
&& GET_GREENMASK(v)==0x00ff00
&& GET_BLUEMASK(v) ==0xff0000
&& CHECK_BYTE_ORDER(v)
&& v->BitsPerPixel==32
&& v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
/* common 32 bpp config used on SGI, Sun */
v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
}
else if (GET_REDMASK(v) == 0xff0000
&& GET_GREENMASK(v)== 0x00ff00
&& GET_BLUEMASK(v) == 0x0000ff
&& CHECK_BYTE_ORDER(v)
&& v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
if (v->BitsPerPixel==32) {
/* if 32 bpp, and visual indicates 8 bpp alpha channel */
if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
else
v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
}
else if (v->BitsPerPixel == 24) {
v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
}
}
else if (GET_REDMASK(v) ==0xf800
&& GET_GREENMASK(v)==0x07e0
&& GET_BLUEMASK(v) ==0x001f
&& CHECK_BYTE_ORDER(v)
&& v->BitsPerPixel==16
&& v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
/* 5-6-5 RGB */
v->undithered_pf = PF_5R6G5B;
v->dithered_pf = PF_Dither_5R6G5B;
}
}
