/*
 * Mesa 3-D graphics library
 *
 * Copyright 2009, VMware, Inc.
 * All Rights Reserved.
 * Copyright (C) 2010 LunarG Inc.
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Keith Whitwell <keithw@vmware.com> Jakob Bornecrantz
 *    <wallbraker@gmail.com> Chia-I Wu <olv@lunarg.com>
 */

#include <xf86drm.h>
#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "util/u_format.h"
#include "util/u_debug.h"
#include "state_tracker/drm_driver.h"
#include "state_tracker/st_texture.h"
#include "state_tracker/st_context.h"
#include "main/texobj.h"

#include "dri_screen.h"
#include "dri_context.h"
#include "dri_drawable.h"
#include "dri2_buffer.h"

/**
 * DRI2 flush extension.
 */
static void
dri2_flush_drawable(__DRIdrawable *dPriv)
{
   dri_flush(dPriv->driContextPriv, dPriv, __DRI2_FLUSH_DRAWABLE, -1);
}

static void
dri2_invalidate_drawable(__DRIdrawable *dPriv)
{
   struct dri_drawable *drawable = dri_drawable(dPriv);

   dri2InvalidateDrawable(dPriv);
   drawable->dPriv->lastStamp = drawable->dPriv->dri2.stamp;

   p_atomic_inc(&drawable->base.stamp);
}

static const __DRI2flushExtension dri2FlushExtension = {
    { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
    dri2_flush_drawable,
    dri2_invalidate_drawable,
    dri_flush,
};

/**
 * Retrieve __DRIbuffer from the DRI loader.
 */
static __DRIbuffer *
dri2_drawable_get_buffers(struct dri_drawable *drawable,
                          const enum st_attachment_type *atts,
                          unsigned *count)
{
   __DRIdrawable *dri_drawable = drawable->dPriv;
   struct __DRIdri2LoaderExtensionRec *loader = drawable->sPriv->dri2.loader;
   boolean with_format;
   __DRIbuffer *buffers;
   int num_buffers;
   unsigned attachments[10];
   unsigned num_attachments, i;

   assert(loader);
   with_format = dri_with_format(drawable->sPriv);

   num_attachments = 0;

   /* for Xserver 1.6.0 (DRI2 version 1) we always need to ask for the front */
   if (!with_format)
      attachments[num_attachments++] = __DRI_BUFFER_FRONT_LEFT;

   for (i = 0; i < *count; i++) {
      enum pipe_format format;
      unsigned bind;
      int att, depth;

      dri_drawable_get_format(drawable, atts[i], &format, &bind);
      if (format == PIPE_FORMAT_NONE)
         continue;

      switch (atts[i]) {
      case ST_ATTACHMENT_FRONT_LEFT:
         /* already added */
         if (!with_format)
            continue;
         att = __DRI_BUFFER_FRONT_LEFT;
         break;
      case ST_ATTACHMENT_BACK_LEFT:
         att = __DRI_BUFFER_BACK_LEFT;
         break;
      case ST_ATTACHMENT_FRONT_RIGHT:
         att = __DRI_BUFFER_FRONT_RIGHT;
         break;
      case ST_ATTACHMENT_BACK_RIGHT:
         att = __DRI_BUFFER_BACK_RIGHT;
         break;
      default:
         continue;
      }

      /*
       * In this switch statement we must support all formats that
       * may occur as the stvis->color_format.
       */
      switch(format) {
      case PIPE_FORMAT_B8G8R8A8_UNORM:
	 depth = 32;
	 break;
      case PIPE_FORMAT_B8G8R8X8_UNORM:
	 depth = 24;
	 break;
      case PIPE_FORMAT_B5G6R5_UNORM:
	 depth = 16;
	 break;
      default:
	 depth = util_format_get_blocksizebits(format);
	 assert(!"Unexpected format in dri2_drawable_get_buffers()");
      }

      attachments[num_attachments++] = att;
      if (with_format) {
         attachments[num_attachments++] = depth;
      }
   }

   if (with_format) {
      num_attachments /= 2;
      buffers = loader->getBuffersWithFormat(dri_drawable,
            &dri_drawable->w, &dri_drawable->h,
            attachments, num_attachments,
            &num_buffers, dri_drawable->loaderPrivate);
   }
   else {
      buffers = loader->getBuffers(dri_drawable,
            &dri_drawable->w, &dri_drawable->h,
            attachments, num_attachments,
            &num_buffers, dri_drawable->loaderPrivate);
   }

   if (buffers)
      *count = num_buffers;

   return buffers;
}

/**
 * Process __DRIbuffer and convert them into pipe_resources.
 */
static void
dri2_drawable_process_buffers(struct dri_context *ctx,
                              struct dri_drawable *drawable,
                              __DRIbuffer *buffers, unsigned buffer_count,
                              const enum st_attachment_type *atts,
                              unsigned att_count)
{
   struct dri_screen *screen = dri_screen(drawable->sPriv);
   __DRIdrawable *dri_drawable = drawable->dPriv;
   struct pipe_resource templ;
   struct winsys_handle whandle;
   boolean alloc_depthstencil = FALSE;
   unsigned i, j, bind;

   if (drawable->old_num == buffer_count &&
       drawable->old_w == dri_drawable->w &&
       drawable->old_h == dri_drawable->h &&
       memcmp(drawable->old, buffers, sizeof(__DRIbuffer) * buffer_count) == 0)
      return;

   /* See if we need a depth-stencil buffer. */
   for (i = 0; i < att_count; i++) {
      if (atts[i] == ST_ATTACHMENT_DEPTH_STENCIL) {
         alloc_depthstencil = TRUE;
         break;
      }
   }

   /* Delete the resources we won't need. */
   for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
      /* Don't delete the depth-stencil buffer, we can reuse it. */
      if (i == ST_ATTACHMENT_DEPTH_STENCIL && alloc_depthstencil)
         continue;

      pipe_resource_reference(&drawable->textures[i], NULL);
   }

   if (drawable->stvis.samples > 1) {
      for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
         boolean del = TRUE;

         /* Don't delete MSAA resources for the attachments which are enabled,
          * we can reuse them. */
         for (j = 0; j < att_count; j++) {
            if (i == atts[j]) {
               del = FALSE;
               break;
            }
         }

         if (del) {
            pipe_resource_reference(&drawable->msaa_textures[i], NULL);
         }
      }
   }

   memset(&templ, 0, sizeof(templ));
   templ.target = screen->target;
   templ.last_level = 0;
   templ.width0 = dri_drawable->w;
   templ.height0 = dri_drawable->h;
   templ.depth0 = 1;
   templ.array_size = 1;

   memset(&whandle, 0, sizeof(whandle));

   /* Process DRI-provided buffers and get pipe_resources. */
   for (i = 0; i < buffer_count; i++) {
      __DRIbuffer *buf = &buffers[i];
      enum st_attachment_type statt;
      enum pipe_format format;

      switch (buf->attachment) {
      case __DRI_BUFFER_FRONT_LEFT:
         if (!screen->auto_fake_front) {
            continue; /* invalid attachment */
         }
         /* fallthrough */
      case __DRI_BUFFER_FAKE_FRONT_LEFT:
         statt = ST_ATTACHMENT_FRONT_LEFT;
         break;
      case __DRI_BUFFER_BACK_LEFT:
         statt = ST_ATTACHMENT_BACK_LEFT;
         break;
      default:
         continue; /* invalid attachment */
      }

      dri_drawable_get_format(drawable, statt, &format, &bind);
      if (format == PIPE_FORMAT_NONE)
         continue;

      templ.format = format;
      templ.bind = bind;
      whandle.type = DRM_API_HANDLE_TYPE_SHARED;
      whandle.handle = buf->name;
      whandle.stride = buf->pitch;

      drawable->textures[statt] =
         screen->base.screen->resource_from_handle(screen->base.screen,
               &templ, &whandle);
      assert(drawable->textures[statt]);
   }

   /* Allocate private MSAA colorbuffers. */
   if (drawable->stvis.samples > 1) {
      for (i = 0; i < att_count; i++) {
         enum st_attachment_type att = atts[i];

         if (att == ST_ATTACHMENT_DEPTH_STENCIL)
            continue;

         if (drawable->textures[att]) {
            templ.format = drawable->textures[att]->format;
            templ.bind = drawable->textures[att]->bind;
            templ.nr_samples = drawable->stvis.samples;

            /* Try to reuse the resource.
             * (the other resource parameters should be constant)
             */
            if (!drawable->msaa_textures[att] ||
                drawable->msaa_textures[att]->width0 != templ.width0 ||
                drawable->msaa_textures[att]->height0 != templ.height0) {
               /* Allocate a new one. */
               pipe_resource_reference(&drawable->msaa_textures[att], NULL);

               drawable->msaa_textures[att] =
                  screen->base.screen->resource_create(screen->base.screen,
                                                       &templ);
               assert(drawable->msaa_textures[att]);

               /* If there are any MSAA resources, we should initialize them
                * such that they contain the same data as the single-sample
                * resources we just got from the X server.
                *
                * The reason for this is that the state tracker (and
                * therefore the app) can access the MSAA resources only.
                * The single-sample resources are not exposed
                * to the state tracker.
                *
                */
               dri_pipe_blit(ctx->st->pipe,
                             drawable->msaa_textures[att],
                             drawable->textures[att]);
            }
         }
         else {
            pipe_resource_reference(&drawable->msaa_textures[att], NULL);
         }
      }
   }

   /* Allocate a private depth-stencil buffer. */
   if (alloc_depthstencil) {
      enum st_attachment_type att = ST_ATTACHMENT_DEPTH_STENCIL;
      struct pipe_resource **zsbuf;
      enum pipe_format format;
      unsigned bind;

      dri_drawable_get_format(drawable, att, &format, &bind);

      if (format) {
         templ.format = format;
         templ.bind = bind;

         if (drawable->stvis.samples > 1) {
            templ.nr_samples = drawable->stvis.samples;
            zsbuf = &drawable->msaa_textures[att];
         }
         else {
            templ.nr_samples = 0;
            zsbuf = &drawable->textures[att];
         }

         /* Try to reuse the resource.
          * (the other resource parameters should be constant)
          */
         if (!*zsbuf ||
             (*zsbuf)->width0 != templ.width0 ||
             (*zsbuf)->height0 != templ.height0) {
            /* Allocate a new one. */
            pipe_resource_reference(zsbuf, NULL);
            *zsbuf = screen->base.screen->resource_create(screen->base.screen,
                                                          &templ);
            assert(*zsbuf);
         }
      }
      else {
         pipe_resource_reference(&drawable->msaa_textures[att], NULL);
         pipe_resource_reference(&drawable->textures[att], NULL);
      }
   }

   drawable->old_num = buffer_count;
   drawable->old_w = dri_drawable->w;
   drawable->old_h = dri_drawable->h;
   memcpy(drawable->old, buffers, sizeof(__DRIbuffer) * buffer_count);
}

static __DRIbuffer *
dri2_allocate_buffer(__DRIscreen *sPriv,
                     unsigned attachment, unsigned format,
                     int width, int height)
{
   struct dri_screen *screen = dri_screen(sPriv);
   struct dri2_buffer *buffer;
   struct pipe_resource templ;
   enum pipe_format pf;
   unsigned bind = 0;
   struct winsys_handle whandle;

   switch (attachment) {
      case __DRI_BUFFER_FRONT_LEFT:
      case __DRI_BUFFER_FAKE_FRONT_LEFT:
         bind = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;
         break;
      case __DRI_BUFFER_BACK_LEFT:
         bind = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;
         break;
      case __DRI_BUFFER_DEPTH:
      case __DRI_BUFFER_DEPTH_STENCIL:
      case __DRI_BUFFER_STENCIL:
            bind = PIPE_BIND_DEPTH_STENCIL; /* XXX sampler? */
         break;
   }

   /* because we get the handle and stride */
   bind |= PIPE_BIND_SHARED;

   switch (format) {
      case 32:
         pf = PIPE_FORMAT_B8G8R8A8_UNORM;
         break;
      case 24:
         pf = PIPE_FORMAT_B8G8R8X8_UNORM;
         break;
      case 16:
         pf = PIPE_FORMAT_Z16_UNORM;
         break;
      default:
         return NULL;
   }

   buffer = CALLOC_STRUCT(dri2_buffer);
   if (!buffer)
      return NULL;

   memset(&templ, 0, sizeof(templ));
   templ.bind = bind;
   templ.format = pf;
   templ.target = PIPE_TEXTURE_2D;
   templ.last_level = 0;
   templ.width0 = width;
   templ.height0 = height;
   templ.depth0 = 1;
   templ.array_size = 1;

   buffer->resource =
      screen->base.screen->resource_create(screen->base.screen, &templ);
   if (!buffer->resource) {
      FREE(buffer);
      return NULL;
   }

   memset(&whandle, 0, sizeof(whandle));
   whandle.type = DRM_API_HANDLE_TYPE_SHARED;
   screen->base.screen->resource_get_handle(screen->base.screen,
         buffer->resource, &whandle);

   buffer->base.attachment = attachment;
   buffer->base.name = whandle.handle;
   buffer->base.cpp = util_format_get_blocksize(pf);
   buffer->base.pitch = whandle.stride;

   return &buffer->base;
}

static void
dri2_release_buffer(__DRIscreen *sPriv, __DRIbuffer *bPriv)
{
   struct dri2_buffer *buffer = dri2_buffer(bPriv);

   pipe_resource_reference(&buffer->resource, NULL);
   FREE(buffer);
}

/*
 * Backend functions for st_framebuffer interface.
 */

static void
dri2_allocate_textures(struct dri_context *ctx,
                       struct dri_drawable *drawable,
                       const enum st_attachment_type *statts,
                       unsigned statts_count)
{
   __DRIbuffer *buffers;
   unsigned num_buffers = statts_count;

   buffers = dri2_drawable_get_buffers(drawable, statts, &num_buffers);
   if (buffers)
      dri2_drawable_process_buffers(ctx, drawable, buffers, num_buffers,
                                    statts, statts_count);
}

static void
dri2_flush_frontbuffer(struct dri_context *ctx,
                       struct dri_drawable *drawable,
                       enum st_attachment_type statt)
{
   __DRIdrawable *dri_drawable = drawable->dPriv;
   struct __DRIdri2LoaderExtensionRec *loader = drawable->sPriv->dri2.loader;
   struct pipe_context *pipe = ctx->st->pipe;

   if (statt != ST_ATTACHMENT_FRONT_LEFT)
      return;

   if (drawable->stvis.samples > 1) {
      /* Resolve the front buffer. */
      dri_pipe_blit(ctx->st->pipe,
                    drawable->textures[ST_ATTACHMENT_FRONT_LEFT],
                    drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT]);
   }

   if (drawable->textures[ST_ATTACHMENT_FRONT_LEFT]) {
      pipe->flush_resource(pipe, drawable->textures[ST_ATTACHMENT_FRONT_LEFT]);
   }

   pipe->flush(pipe, NULL, 0);

   if (loader->flushFrontBuffer) {
      loader->flushFrontBuffer(dri_drawable, dri_drawable->loaderPrivate);
   }
}

static void
dri2_update_tex_buffer(struct dri_drawable *drawable,
                       struct dri_context *ctx,
                       struct pipe_resource *res)
{
   /* no-op */
}

static __DRIimage *
dri2_lookup_egl_image(struct dri_screen *screen, void *handle)
{
   __DRIimageLookupExtension *loader = screen->sPriv->dri2.image;
   __DRIimage *img;

   if (!loader->lookupEGLImage)
      return NULL;

   img = loader->lookupEGLImage(screen->sPriv,
				handle, screen->sPriv->loaderPrivate);

   return img;
}

static __DRIimage *
dri2_create_image_from_winsys(__DRIscreen *_screen,
                              int width, int height, int format,
                              struct winsys_handle *whandle, int pitch,
                              void *loaderPrivate)
{
   struct dri_screen *screen = dri_screen(_screen);
   __DRIimage *img;
   struct pipe_resource templ;
   unsigned tex_usage;
   enum pipe_format pf;

   tex_usage = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;

   switch (format) {
   case __DRI_IMAGE_FORMAT_RGB565:
      pf = PIPE_FORMAT_B5G6R5_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_XRGB8888:
      pf = PIPE_FORMAT_B8G8R8X8_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_ARGB8888:
      pf = PIPE_FORMAT_B8G8R8A8_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_ABGR8888:
      pf = PIPE_FORMAT_R8G8B8A8_UNORM;
      break;
   default:
      pf = PIPE_FORMAT_NONE;
      break;
   }
   if (pf == PIPE_FORMAT_NONE)
      return NULL;

   img = CALLOC_STRUCT(__DRIimageRec);
   if (!img)
      return NULL;

   memset(&templ, 0, sizeof(templ));
   templ.bind = tex_usage;
   templ.format = pf;
   templ.target = screen->target;
   templ.last_level = 0;
   templ.width0 = width;
   templ.height0 = height;
   templ.depth0 = 1;
   templ.array_size = 1;

   whandle->stride = pitch * util_format_get_blocksize(pf);

   img->texture = screen->base.screen->resource_from_handle(screen->base.screen,
         &templ, whandle);
   if (!img->texture) {
      FREE(img);
      return NULL;
   }

   img->level = 0;
   img->layer = 0;
   img->dri_format = format;
   img->loader_private = loaderPrivate;

   return img;
}

static __DRIimage *
dri2_create_image_from_name(__DRIscreen *_screen,
                            int width, int height, int format,
                            int name, int pitch, void *loaderPrivate)
{
   struct winsys_handle whandle;

   memset(&whandle, 0, sizeof(whandle));
   whandle.type = DRM_API_HANDLE_TYPE_SHARED;
   whandle.handle = name;

   return dri2_create_image_from_winsys(_screen, width, height, format,
                                        &whandle, pitch, loaderPrivate);
}

static __DRIimage *
dri2_create_image_from_fd(__DRIscreen *_screen,
                          int width, int height, int format,
                          int fd, int pitch, void *loaderPrivate)
{
   struct winsys_handle whandle;

   if (fd < 0)
      return NULL;

   memset(&whandle, 0, sizeof(whandle));
   whandle.type = DRM_API_HANDLE_TYPE_FD;
   whandle.handle = (unsigned)fd;

   return dri2_create_image_from_winsys(_screen, width, height, format,
                                        &whandle, pitch, loaderPrivate);
}

static __DRIimage *
dri2_create_image_from_renderbuffer(__DRIcontext *context,
				    int renderbuffer, void *loaderPrivate)
{
   struct dri_context *ctx = dri_context(context);

   if (!ctx->st->get_resource_for_egl_image)
      return NULL;

   /* TODO */
   return NULL;
}

static __DRIimage *
dri2_create_image(__DRIscreen *_screen,
                   int width, int height, int format,
                   unsigned int use, void *loaderPrivate)
{
   struct dri_screen *screen = dri_screen(_screen);
   __DRIimage *img;
   struct pipe_resource templ;
   unsigned tex_usage;
   enum pipe_format pf;

   tex_usage = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;
   if (use & __DRI_IMAGE_USE_SCANOUT)
      tex_usage |= PIPE_BIND_SCANOUT;
   if (use & __DRI_IMAGE_USE_SHARE)
      tex_usage |= PIPE_BIND_SHARED;
   if (use & __DRI_IMAGE_USE_LINEAR)
      tex_usage |= PIPE_BIND_LINEAR;
   if (use & __DRI_IMAGE_USE_CURSOR) {
      if (width != 64 || height != 64)
         return NULL;
      tex_usage |= PIPE_BIND_CURSOR;
   }

   switch (format) {
   case __DRI_IMAGE_FORMAT_RGB565:
      pf = PIPE_FORMAT_B5G6R5_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_XRGB8888:
      pf = PIPE_FORMAT_B8G8R8X8_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_ARGB8888:
      pf = PIPE_FORMAT_B8G8R8A8_UNORM;
      break;
   case __DRI_IMAGE_FORMAT_ABGR8888:
      pf = PIPE_FORMAT_R8G8B8A8_UNORM;
      break;
   default:
      pf = PIPE_FORMAT_NONE;
      break;
   }
   if (pf == PIPE_FORMAT_NONE)
      return NULL;

   img = CALLOC_STRUCT(__DRIimageRec);
   if (!img)
      return NULL;

   memset(&templ, 0, sizeof(templ));
   templ.bind = tex_usage;
   templ.format = pf;
   templ.target = PIPE_TEXTURE_2D;
   templ.last_level = 0;
   templ.width0 = width;
   templ.height0 = height;
   templ.depth0 = 1;
   templ.array_size = 1;

   img->texture = screen->base.screen->resource_create(screen->base.screen, &templ);
   if (!img->texture) {
      FREE(img);
      return NULL;
   }

   img->level = 0;
   img->layer = 0;
   img->dri_format = format;
   img->dri_components = 0;

   img->loader_private = loaderPrivate;
   return img;
}

static GLboolean
dri2_query_image(__DRIimage *image, int attrib, int *value)
{
   struct winsys_handle whandle;
   memset(&whandle, 0, sizeof(whandle));

   switch (attrib) {
   case __DRI_IMAGE_ATTRIB_STRIDE:
      whandle.type = DRM_API_HANDLE_TYPE_KMS;
      image->texture->screen->resource_get_handle(image->texture->screen,
            image->texture, &whandle);
      *value = whandle.stride;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_HANDLE:
      whandle.type = DRM_API_HANDLE_TYPE_KMS;
      image->texture->screen->resource_get_handle(image->texture->screen,
         image->texture, &whandle);
      *value = whandle.handle;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_NAME:
      whandle.type = DRM_API_HANDLE_TYPE_SHARED;
      image->texture->screen->resource_get_handle(image->texture->screen,
         image->texture, &whandle);
      *value = whandle.handle;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_FD:
      whandle.type= DRM_API_HANDLE_TYPE_FD;
      image->texture->screen->resource_get_handle(image->texture->screen,
         image->texture, &whandle);
      *value = whandle.handle;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_FORMAT:
      *value = image->dri_format;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_WIDTH:
      *value = image->texture->width0;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_HEIGHT:
      *value = image->texture->height0;
      return GL_TRUE;
   case __DRI_IMAGE_ATTRIB_COMPONENTS:
      if (image->dri_components == 0)
         return GL_FALSE;
      *value = image->dri_components;
      return GL_TRUE;
   default:
      return GL_FALSE;
   }
}

static __DRIimage *
dri2_dup_image(__DRIimage *image, void *loaderPrivate)
{
   __DRIimage *img;

   img = CALLOC_STRUCT(__DRIimageRec);
   if (!img)
      return NULL;

   img->texture = NULL;
   pipe_resource_reference(&img->texture, image->texture);
   img->level = image->level;
   img->layer = image->layer;
   /* This should be 0 for sub images, but dup is also used for base images. */
   img->dri_components = image->dri_components;
   img->loader_private = loaderPrivate;

   return img;
}

static GLboolean
dri2_validate_usage(__DRIimage *image, unsigned int use)
{
   /*
    * Gallium drivers are bad at adding usages to the resources
    * once opened again in another process, which is the main use
    * case for this, so we have to lie.
    */
   if (image != NULL)
      return GL_TRUE;
   else
      return GL_FALSE;
}

static __DRIimage *
dri2_from_names(__DRIscreen *screen, int width, int height, int format,
                int *names, int num_names, int *strides, int *offsets,
                void *loaderPrivate)
{
   __DRIimage *img;
   int stride, dri_components;

   if (num_names != 1)
      return NULL;
   if (offsets[0] != 0)
      return NULL;

   switch(format) {
   case __DRI_IMAGE_FOURCC_RGB565:
      format = __DRI_IMAGE_FORMAT_RGB565;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   case __DRI_IMAGE_FOURCC_ARGB8888:
      format = __DRI_IMAGE_FORMAT_ARGB8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGBA;
      break;
   case __DRI_IMAGE_FOURCC_XRGB8888:
      format = __DRI_IMAGE_FORMAT_XRGB8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   case __DRI_IMAGE_FOURCC_ABGR8888:
      format = __DRI_IMAGE_FORMAT_ABGR8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGBA;
      break;
   case __DRI_IMAGE_FOURCC_XBGR8888:
      format = __DRI_IMAGE_FORMAT_XBGR8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   default:
      return NULL;
   }

   /* Strides are in bytes not pixels. */
   stride = strides[0] /4;

   img = dri2_create_image_from_name(screen, width, height, format,
                                     names[0], stride, loaderPrivate);
   if (img == NULL)
      return NULL;

   img->dri_components = dri_components;
   return img;
}

static __DRIimage *
dri2_from_planar(__DRIimage *image, int plane, void *loaderPrivate)
{
   __DRIimage *img;

   if (plane != 0)
      return NULL;

   if (image->dri_components == 0)
      return NULL;

   img = dri2_dup_image(image, loaderPrivate);
   if (img == NULL)
      return NULL;

   /* set this to 0 for sub images. */
   img->dri_components = 0;
   return img;
}

static __DRIimage *
dri2_create_from_texture(__DRIcontext *context, int target, unsigned texture,
                         int depth, int level, unsigned *error,
                         void *loaderPrivate)
{
   __DRIimage *img;
   struct gl_context *ctx = ((struct st_context *)dri_context(context)->st)->ctx;
   struct gl_texture_object *obj;
   struct pipe_resource *tex;
   GLuint face = 0;

   obj = _mesa_lookup_texture(ctx, texture);
   if (!obj || obj->Target != target) {
      *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
      return NULL;
   }

   tex = st_get_texobj_resource(obj);
   if (!tex) {
      *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
      return NULL;
   }

   if (target == GL_TEXTURE_CUBE_MAP)
      face = depth;

   _mesa_test_texobj_completeness(ctx, obj);
   if (!obj->_BaseComplete || (level > 0 && !obj->_MipmapComplete)) {
      *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
      return NULL;
   }

   if (level < obj->BaseLevel || level > obj->_MaxLevel) {
      *error = __DRI_IMAGE_ERROR_BAD_MATCH;
      return NULL;
   }

   if (target == GL_TEXTURE_3D && obj->Image[face][level]->Depth < depth) {
      *error = __DRI_IMAGE_ERROR_BAD_MATCH;
      return NULL;
   }

   img = CALLOC_STRUCT(__DRIimageRec);
   if (!img) {
      *error = __DRI_IMAGE_ERROR_BAD_ALLOC;
      return NULL;
   }

   img->level = level;
   img->layer = depth;
   img->dri_format = driGLFormatToImageFormat(obj->Image[face][level]->TexFormat);

   img->loader_private = loaderPrivate;

   if (img->dri_format == __DRI_IMAGE_FORMAT_NONE) {
      *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
      free(img);
      return NULL;
   }

   pipe_resource_reference(&img->texture, tex);

   *error = __DRI_IMAGE_ERROR_SUCCESS;
   return img;
}

static __DRIimage *
dri2_from_fds(__DRIscreen *screen, int width, int height, int fourcc,
              int *fds, int num_fds, int *strides, int *offsets,
              void *loaderPrivate)
{
   __DRIimage *img;
   int format, stride, dri_components;

   if (num_fds != 1)
      return NULL;
   if (offsets[0] != 0)
      return NULL;

   switch(fourcc) {
   case __DRI_IMAGE_FOURCC_RGB565:
      format = __DRI_IMAGE_FORMAT_RGB565;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   case __DRI_IMAGE_FOURCC_ARGB8888:
      format = __DRI_IMAGE_FORMAT_ARGB8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGBA;
      break;
   case __DRI_IMAGE_FOURCC_XRGB8888:
      format = __DRI_IMAGE_FORMAT_XRGB8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   case __DRI_IMAGE_FOURCC_ABGR8888:
      format = __DRI_IMAGE_FORMAT_ABGR8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGBA;
      break;
   case __DRI_IMAGE_FOURCC_XBGR8888:
      format = __DRI_IMAGE_FORMAT_XBGR8888;
      dri_components = __DRI_IMAGE_COMPONENTS_RGB;
      break;
   default:
      return NULL;
   }

   /* Strides are in bytes not pixels. */
   stride = strides[0] /4;

   img = dri2_create_image_from_fd(screen, width, height, format,
                                   fds[0], stride, loaderPrivate);
   if (img == NULL)
      return NULL;

   img->dri_components = dri_components;
   return img;
}

static void
dri2_destroy_image(__DRIimage *img)
{
   pipe_resource_reference(&img->texture, NULL);
   FREE(img);
}

static struct __DRIimageExtensionRec dri2ImageExtension = {
    { __DRI_IMAGE, 6 },
    dri2_create_image_from_name,
    dri2_create_image_from_renderbuffer,
    dri2_destroy_image,
    dri2_create_image,
    dri2_query_image,
    dri2_dup_image,
    dri2_validate_usage,
    dri2_from_names,
    dri2_from_planar,
    dri2_create_from_texture,
};

/*
 * Backend function init_screen.
 */

static const __DRIextension *dri_screen_extensions[] = {
   &driTexBufferExtension.base,
   &dri2FlushExtension.base,
   &dri2ImageExtension.base,
   &dri2ConfigQueryExtension.base,
   &dri2ThrottleExtension.base,
   NULL
};

/**
 * This is the driver specific part of the createNewScreen entry point.
 *
 * Returns the struct gl_config supported by this driver.
 */
static const __DRIconfig **
dri2_init_screen(__DRIscreen * sPriv)
{
   const __DRIconfig **configs;
   struct dri_screen *screen;
   struct pipe_screen *pscreen;
   const struct drm_conf_ret *throttle_ret = NULL;
   const struct drm_conf_ret *dmabuf_ret = NULL;

   screen = CALLOC_STRUCT(dri_screen);
   if (!screen)
      return NULL;

   screen->sPriv = sPriv;
   screen->fd = sPriv->fd;

   sPriv->driverPrivate = (void *)screen;

   pscreen = driver_descriptor.create_screen(screen->fd);
   if (driver_descriptor.configuration) {
      throttle_ret = driver_descriptor.configuration(DRM_CONF_THROTTLE);
      dmabuf_ret = driver_descriptor.configuration(DRM_CONF_SHARE_FD);
   }

   if (throttle_ret && throttle_ret->val.val_int != -1) {
      screen->throttling_enabled = TRUE;
      screen->default_throttle_frames = throttle_ret->val.val_int;
   }

#ifdef DRM_CAP_PRIME /* Old libdrm? */
   if (dmabuf_ret && dmabuf_ret->val.val_bool) {
      uint64_t cap;

      if (drmGetCap(sPriv->fd, DRM_CAP_PRIME, &cap) == 0 &&
          (cap & DRM_PRIME_CAP_IMPORT)) {

         dri2ImageExtension.base.version = 7;
         dri2ImageExtension.createImageFromFds = dri2_from_fds;
      }
   }
#endif /* DRM_CAP_PRIME */

   sPriv->extensions = dri_screen_extensions;

   /* dri_init_screen_helper checks pscreen for us */

   configs = dri_init_screen_helper(screen, pscreen);
   if (!configs)
      goto fail;

   screen->auto_fake_front = dri_with_format(sPriv);
   screen->broken_invalidate = !sPriv->dri2.useInvalidate;
   screen->lookup_egl_image = dri2_lookup_egl_image;

   return configs;
fail:
   dri_destroy_screen_helper(screen);
   FREE(screen);
   return NULL;
}

static boolean
dri2_create_buffer(__DRIscreen * sPriv,
                   __DRIdrawable * dPriv,
                   const struct gl_config * visual, boolean isPixmap)
{
   struct dri_drawable *drawable = NULL;

   if (!dri_create_buffer(sPriv, dPriv, visual, isPixmap))
      return FALSE;

   drawable = dPriv->driverPrivate;

   drawable->allocate_textures = dri2_allocate_textures;
   drawable->flush_frontbuffer = dri2_flush_frontbuffer;
   drawable->update_tex_buffer = dri2_update_tex_buffer;

   return TRUE;
}

/**
 * DRI driver virtual function table.
 *
 * DRI versions differ in their implementation of init_screen and swap_buffers.
 */
const struct __DriverAPIRec driDriverAPI = {
   .InitScreen = dri2_init_screen,
   .DestroyScreen = dri_destroy_screen,
   .CreateContext = dri_create_context,
   .DestroyContext = dri_destroy_context,
   .CreateBuffer = dri2_create_buffer,
   .DestroyBuffer = dri_destroy_buffer,
   .MakeCurrent = dri_make_current,
   .UnbindContext = dri_unbind_context,

   .AllocateBuffer = dri2_allocate_buffer,
   .ReleaseBuffer  = dri2_release_buffer,
};

/* This is the table of extensions that the loader will dlsym() for. */
PUBLIC const __DRIextension *__driDriverExtensions[] = {
    &driCoreExtension.base,
    &driDRI2Extension.base,
    &gallium_config_options.base,
    NULL
};

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