path: root/src/gallium/state_trackers/dri2/dri_screen.c

/**************************************************************************
 *
 * Copyright 2009, VMware, Inc.
 * 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 VMWARE 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.
 *
 **************************************************************************/
/*
 * Author: Keith Whitwell <keithw@vmware.com>
 * Author: Jakob Bornecrantz <wallbraker@gmail.com>
 */

#include "utils.h"
#include "vblank.h"
#include "xmlpool.h"

#include "dri_screen.h"
#include "dri_context.h"
#include "dri_drawable.h"

#include "pipe/p_context.h"
#include "pipe/p_screen.h"
#include "pipe/p_inlines.h"
#include "state_tracker/drm_api.h"
#include "state_tracker/st_public.h"
#include "state_tracker/st_cb_fbo.h"


PUBLIC const char __driConfigOptions[] =
   DRI_CONF_BEGIN DRI_CONF_SECTION_PERFORMANCE
    DRI_CONF_FTHROTTLE_MODE(DRI_CONF_FTHROTTLE_IRQS)
    DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_0)
   DRI_CONF_SECTION_END DRI_CONF_SECTION_QUALITY
    /*DRI_CONF_FORCE_S3TC_ENABLE(false)*/
    DRI_CONF_ALLOW_LARGE_TEXTURES(1)
   DRI_CONF_SECTION_END DRI_CONF_END;


const uint __driNConfigOptions = 3;


static const __DRIextension *dri_screen_extensions[] = {
    &driReadDrawableExtension,
    &driCopySubBufferExtension.base,
    &driSwapControlExtension.base,
    &driFrameTrackingExtension.base,
    &driMediaStreamCounterExtension.base,
    NULL
};


static void
dri_get_drm_minor(struct dri_screen *screen)
{
   /* TODO get the real minor */
   screen->minor = 0;
}


static void
dri_get_device_id(struct dri_screen *screen)
{
   char path[512];
   FILE *file;

   /*
    * There must be a better way to get the deviceID.
    * XXX this only works on Linux.
    */
   snprintf(path, sizeof(path), "/sys/class/drm/card%d/device/device", screen->minor);
   file = fopen(path, "r");
   if (!file) {
      return;
   }

   fgets(path, sizeof(path), file);
   sscanf(path, "%x", &screen->deviceID);
   fclose(file);
}


static const __DRIconfig **
dri_fill_in_modes(__DRIscreenPrivate *psp,
                  unsigned pixel_bits, unsigned depth_bits,
                  unsigned stencil_bits, GLboolean have_back_buffer)
{
   __DRIconfig **configs;
   __GLcontextModes *m;
   unsigned num_modes;
   uint8_t depth_bits_array[3];
   uint8_t stencil_bits_array[3];
   uint8_t msaa_samples_array[1];
   unsigned depth_buffer_factor;
   unsigned back_buffer_factor;
   unsigned msaa_samples_factor;
   GLenum fb_format;
   GLenum fb_type;
   int i;

   static const GLenum back_buffer_modes[] = {
      GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
   };

   /* TODO probe the hardware of what is supports */
   depth_bits_array[0] = 0;
   depth_bits_array[1] = 24;
   depth_bits_array[2] = 24;

   stencil_bits_array[0] = 0;   /* no depth or stencil */
   stencil_bits_array[1] = 0;   /* z24x8 */
   stencil_bits_array[2] = 8;   /* z24s8 */

   msaa_samples_array[0] = 0;

   depth_buffer_factor = 3;
   back_buffer_factor = 3;
   msaa_samples_factor = 1;

   num_modes = depth_buffer_factor * back_buffer_factor * msaa_samples_factor * 4;

   if (pixel_bits == 16) {
      fb_format = GL_RGB;
      fb_type = GL_UNSIGNED_SHORT_5_6_5;
   }
   else {
      fb_format = GL_BGRA;
      fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
   }

   configs = driCreateConfigs(fb_format, fb_type,
			      depth_bits_array,
                              stencil_bits_array, depth_buffer_factor,
                              back_buffer_modes, back_buffer_factor,
                              msaa_samples_array, msaa_samples_factor);
   if (configs == NULL) {
      debug_printf("%s: driCreateConfigs failed\n", __FUNCTION__);
      return NULL;
   }

   for (i = 0; configs[i]; i++) {
      m = &configs[i]->modes;
      if ((m->stencilBits != 0) && (m->stencilBits != stencil_bits)) {
         m->visualRating = GLX_SLOW_CONFIG;
      }
   }

   return (const const __DRIconfig **) configs;
}


/**
 * Get information about previous buffer swaps.
 */
int
dri_get_swap_info(__DRIdrawablePrivate * dPriv,
                  __DRIswapInfo * sInfo)
{
   if (dPriv == NULL ||
       dPriv->driverPrivate == NULL ||
       sInfo == NULL)
      return -1;
   else
      return 0;
}


/**
 * NULL stub for old dri loaders
 */
const __DRIconfig **
dri_init_screen(__DRIscreenPrivate *sPriv)
{
   return NULL;
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 *
 * Returns the __GLcontextModes supported by this driver.
 */
const __DRIconfig **
dri_init_screen2(__DRIscreenPrivate *sPriv)
{
   struct dri_screen *screen;

   /* Set up dispatch table to cope with all known extensions */
   dri_init_extensions(NULL);

   screen = CALLOC_STRUCT(dri_screen);
   if (!screen)
      goto fail;

   screen->sPriv = sPriv;
   screen->fd = sPriv->fd;
   dri_get_drm_minor(screen);
   dri_get_device_id(screen);
   sPriv->private = (void *) screen;
   sPriv->extensions = dri_screen_extensions;


   screen->pipe_screen = drm_api_hooks.create_screen(screen->fd, screen->deviceID);
   if (!screen->pipe_screen) {
      debug_printf("%s: failed to create pipe_screen\n", __FUNCTION__);
      goto fail;
   }

   /* We need to hook in here */
   screen->pipe_screen->flush_frontbuffer = dri_flush_frontbuffer;

   driParseOptionInfo(&screen->optionCache,
                      __driConfigOptions,
                      __driNConfigOptions);

   return dri_fill_in_modes(sPriv,
                            4 * 8,
                            24,
                            8,
                            1);
fail:
   return NULL;
}


void
dri_destroy_screen(__DRIscreenPrivate * sPriv)
{
   struct dri_screen *screen = dri_screen(sPriv);

   screen->pipe_screen->destroy(screen->pipe_screen);
   FREE(screen);
   sPriv->private = NULL;
}


PUBLIC const struct __DriverAPIRec driDriverAPI = {
   .InitScreen          = dri_init_screen, /* not supported but exported */
   .DestroyScreen       = dri_destroy_screen,
   .CreateContext       = dri_create_context,
   .DestroyContext      = dri_destroy_context,
   .CreateBuffer        = dri_create_buffer,
   .DestroyBuffer       = dri_destroy_buffer,
   .SwapBuffers         = dri_swap_buffers, /* not supported but exported */
   .MakeCurrent         = dri_make_current,
   .UnbindContext       = dri_unbind_context,
   .GetSwapInfo         = dri_get_swap_info,
   .GetDrawableMSC      = driDrawableGetMSC32,
   .WaitForMSC          = driWaitForMSC32,
   .CopySubBuffer       = dri_copy_sub_buffer, /* not supported but exported */
   .InitScreen2         = dri_init_screen2,
};

/* vim: set sw=3 ts=8 sts=3 expandtab: */