text_buffer *text_buffer_alloc(UINT32 bytes, UINT32 lines)
{
text_buffer *text;
/* allocate memory for the text buffer object */
text = global_alloc_nothrow(text_buffer);
if (!text)
return nullptr;
/* allocate memory for the buffer itself */
text->buffer = global_alloc_array_nothrow(char, bytes);
if (!text->buffer)
{
global_free(text);
return nullptr;
}
/* allocate memory for the lines array */
text->lineoffs = global_alloc_array_nothrow(INT32, lines);
if (!text->lineoffs)
{
global_free_array(text->buffer);
global_free(text);
return nullptr;
}
/* initialize the buffer description */
text->bufsize = bytes;
text->linesize = lines;
text_buffer_clear(text);
return text;
}
int renderer_dd::ddraw_create_surfaces()
{
HRESULT result;
// make a description of the primary surface
memset(&primarydesc, 0, sizeof(primarydesc));
primarydesc.dwSize = sizeof(primarydesc);
primarydesc.dwFlags = DDSD_CAPS;
primarydesc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
// for triple-buffered full screen mode, allocate flipping surfaces
if (window().fullscreen() && video_config.triplebuf)
{
primarydesc.dwFlags |= DDSD_BACKBUFFERCOUNT;
primarydesc.ddsCaps.dwCaps |= DDSCAPS_FLIP | DDSCAPS_COMPLEX;
primarydesc.dwBackBufferCount = 2;
}
// create the primary surface and report errors
result = create_surface(&primarydesc, &primary, "primary");
if (result != DD_OK) goto error;
// full screen mode: get the back surface
back = NULL;
if (window().fullscreen() && video_config.triplebuf)
{
DDSCAPS2 caps = { DDSCAPS_BACKBUFFER };
result = IDirectDrawSurface7_GetAttachedSurface(primary, &caps, &back);
if (result != DD_OK)
{
osd_printf_verbose("DirectDraw: Error %08X getting attached back surface\n", (int)result);
goto error;
}
}
// now make a description of our blit surface, based on the primary surface
if (blitwidth == 0 || blitheight == 0)
compute_blit_surface_size();
blitdesc = primarydesc;
blitdesc.dwFlags = DDSD_WIDTH | DDSD_HEIGHT | DDSD_PIXELFORMAT | DDSD_CAPS;
blitdesc.dwWidth = blitwidth;
blitdesc.dwHeight = blitheight;
blitdesc.ddsCaps.dwCaps = DDSCAPS_VIDEOMEMORY;
// then create the blit surface, fall back to system memory if video mem doesn't work
result = create_surface(&blitdesc, &blit, "blit");
if (result != DD_OK)
{
blitdesc.ddsCaps.dwCaps = DDSCAPS_SYSTEMMEMORY;
result = create_surface(&blitdesc, &blit, "blit");
}
if (result != DD_OK) goto error;
// create a memory buffer for offscreen drawing
if (membuffersize < blitwidth * blitheight * 4)
{
membuffersize = blitwidth * blitheight * 4;
global_free_array(membuffer);
membuffer = global_alloc_array_nothrow(UINT8, membuffersize);
}
if (membuffer == NULL)
goto error;
// create a clipper for windowed mode
if (!window().fullscreen() && create_clipper())
goto error;
// full screen mode: set the gamma
if (window().fullscreen())
{
// only set the gamma if it's not 1.0f
windows_options &options = downcast<windows_options &>(window().machine().options());
float brightness = options.full_screen_brightness();
float contrast = options.full_screen_contrast();
float fgamma = options.full_screen_gamma();
if (brightness != 1.0f || contrast != 1.0f || fgamma != 1.0f)
{
// see if we can get a GammaControl object
result = IDirectDrawSurface_QueryInterface(primary, WRAP_REFIID(IID_IDirectDrawGammaControl), (void **)&gamma);
if (result != DD_OK)
{
osd_printf_warning("DirectDraw: Warning - device does not support full screen gamma correction.\n");
this->gamma = NULL;
}
// proceed if we can
if (this->gamma != NULL)
{
DDGAMMARAMP ramp;
int i;
// create a standard ramp and set it
for (i = 0; i < 256; i++)
ramp.red[i] = ramp.green[i] = ramp.blue[i] = apply_brightness_contrast_gamma(i, brightness, contrast, fgamma) << 8;
// attempt to set it
result = IDirectDrawGammaControl_SetGammaRamp(this->gamma, 0, &ramp);
if (result != DD_OK)
osd_printf_verbose("DirectDraw: Error %08X attempting to set gamma correction.\n", (int)result);
}
}
}
// force some updates
update_outer_rects();
return 0;
error:
ddraw_delete_surfaces();
return 1;
}
