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/*

 * Mesa 3-D graphics library

 *

 * 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:

 *    Chia-I Wu 

 */

#include "main/mtypes.h"

#include "main/context.h"

#include "main/texobj.h"

#include "main/teximage.h"

#include "main/texstate.h"

#include "main/framebuffer.h"

#include "main/fbobject.h"

#include "main/renderbuffer.h"

#include "main/version.h"

#include "st_texture.h"

#include "st_context.h"

#include "st_format.h"

#include "st_cb_fbo.h"

#include "st_cb_flush.h"

#include "st_manager.h"

#include "state_tracker/st_gl_api.h"

#include "pipe/p_context.h"

#include "pipe/p_screen.h"

#include "util/u_format.h"

#include "util/u_pointer.h"

#include "util/u_inlines.h"

#include "util/u_atomic.h"

#include "util/u_surface.h"

/**

 * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.

 * Return NULL if the struct gl_framebuffer is a user-created framebuffer.

 * We'll only return non-null for window system framebuffers.

 * Note that this function may fail.

 */

static INLINE struct st_framebuffer *

st_ws_framebuffer(struct gl_framebuffer *fb)

{

   /* FBO cannot be casted.  See st_new_framebuffer */

   if (fb && _mesa_is_winsys_fbo(fb))

      return (struct st_framebuffer *) fb;

   return NULL;

}

/**

 * Map an attachment to a buffer index.

 */

static INLINE gl_buffer_index

attachment_to_buffer_index(enum st_attachment_type statt)

{

   gl_buffer_index index;

   switch (statt) {

   case ST_ATTACHMENT_FRONT_LEFT:

      index = BUFFER_FRONT_LEFT;

      break;

   case ST_ATTACHMENT_BACK_LEFT:

      index = BUFFER_BACK_LEFT;

      break;

   case ST_ATTACHMENT_FRONT_RIGHT:

      index = BUFFER_FRONT_RIGHT;

      break;

   case ST_ATTACHMENT_BACK_RIGHT:

      index = BUFFER_BACK_RIGHT;

      break;

   case ST_ATTACHMENT_DEPTH_STENCIL:

      index = BUFFER_DEPTH;

      break;

   case ST_ATTACHMENT_ACCUM:

      index = BUFFER_ACCUM;

      break;

   case ST_ATTACHMENT_SAMPLE:

   default:

      index = BUFFER_COUNT;

      break;

   }

   return index;

}

/**

 * Map a buffer index to an attachment.

 */

static INLINE enum st_attachment_type

buffer_index_to_attachment(gl_buffer_index index)

{

   enum st_attachment_type statt;

   switch (index) {

   case BUFFER_FRONT_LEFT:

      statt = ST_ATTACHMENT_FRONT_LEFT;

      break;

   case BUFFER_BACK_LEFT:

      statt = ST_ATTACHMENT_BACK_LEFT;

      break;

   case BUFFER_FRONT_RIGHT:

      statt = ST_ATTACHMENT_FRONT_RIGHT;

      break;

   case BUFFER_BACK_RIGHT:

      statt = ST_ATTACHMENT_BACK_RIGHT;

      break;

   case BUFFER_DEPTH:

      statt = ST_ATTACHMENT_DEPTH_STENCIL;

      break;

   case BUFFER_ACCUM:

      statt = ST_ATTACHMENT_ACCUM;

      break;

   default:

      statt = ST_ATTACHMENT_INVALID;

      break;

   }

   return statt;

}

/**

 * Make sure a context picks up the latest cached state of the

 * drawables it binds to.

 */

static void

st_context_validate(struct st_context *st,

                    struct st_framebuffer *stdraw,

                    struct st_framebuffer *stread)

{

    if (stdraw && stdraw->stamp != st->draw_stamp) {

       st->dirty.st |= ST_NEW_FRAMEBUFFER;

       _mesa_resize_framebuffer(st->ctx, &stdraw->Base,

                                stdraw->Base.Width,

                                stdraw->Base.Height);

       st->draw_stamp = stdraw->stamp;

    }

    if (stread && stread->stamp != st->read_stamp) {

       if (stread != stdraw) {

          st->dirty.st |= ST_NEW_FRAMEBUFFER;

          _mesa_resize_framebuffer(st->ctx, &stread->Base,

                                   stread->Base.Width,

                                   stread->Base.Height);

       }

       st->read_stamp = stread->stamp;

    }

}

/**

 * Validate a framebuffer to make sure up-to-date pipe_textures are used.

 * The context is only used for creating pipe surfaces and for calling

 * _mesa_resize_framebuffer().

 * (That should probably be rethought, since those surfaces become

 * drawable state, not context state, and can be freed by another pipe

 * context).

 */

static void

st_framebuffer_validate(struct st_framebuffer *stfb,

                        struct st_context *st)

{

   struct pipe_resource *textures[ST_ATTACHMENT_COUNT];

   uint width, height;

   unsigned i;

   boolean changed = FALSE;

   int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);

   if (stfb->iface_stamp == new_stamp)

      return;

   /* validate the fb */

   do {

      if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,

				 stfb->num_statts, textures))

	 return;

      stfb->iface_stamp = new_stamp;

      new_stamp = p_atomic_read(&stfb->iface->stamp);

   } while(stfb->iface_stamp != new_stamp);

   width = stfb->Base.Width;

   height = stfb->Base.Height;

   for (i = 0; i < stfb->num_statts; i++) {

      struct st_renderbuffer *strb;

      struct pipe_surface *ps, surf_tmpl;

      gl_buffer_index idx;

      if (!textures[i])

         continue;

      idx = attachment_to_buffer_index(stfb->statts[i]);

      if (idx >= BUFFER_COUNT) {

         pipe_resource_reference(&textures[i], NULL);

         continue;

      }

      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);

      assert(strb);

      if (strb->texture == textures[i]) {

         pipe_resource_reference(&textures[i], NULL);

         continue;

      }

      u_surface_default_template(&surf_tmpl, textures[i]);

      ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);

      if (ps) {

         pipe_surface_reference(&strb->surface, ps);

         pipe_resource_reference(&strb->texture, ps->texture);

         /* ownership transfered */

         pipe_surface_reference(&ps, NULL);

         changed = TRUE;

         strb->Base.Width = strb->surface->width;

         strb->Base.Height = strb->surface->height;

         width = strb->Base.Width;

         height = strb->Base.Height;

      }

      pipe_resource_reference(&textures[i], NULL);

   }

   if (changed) {

      ++stfb->stamp;

      _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);

   }

}

/**

 * Update the attachments to validate by looping the existing renderbuffers.

 */

static void

st_framebuffer_update_attachments(struct st_framebuffer *stfb)

{

   gl_buffer_index idx;

   stfb->num_statts = 0;

   for (idx = 0; idx < BUFFER_COUNT; idx++) {

      struct st_renderbuffer *strb;

      enum st_attachment_type statt;

      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);

      if (!strb || strb->software)

         continue;

      statt = buffer_index_to_attachment(idx);

      if (statt != ST_ATTACHMENT_INVALID &&

          st_visual_have_buffers(stfb->iface->visual, 1 << statt))

         stfb->statts[stfb->num_statts++] = statt;

   }

   stfb->stamp++;

}

/**

 * Add a renderbuffer to the framebuffer.

 */

static boolean

st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,

                                gl_buffer_index idx)

{

   struct gl_renderbuffer *rb;

   enum pipe_format format;

   boolean sw;

   if (!stfb->iface)

      return FALSE;

   /* do not distinguish depth/stencil buffers */

   if (idx == BUFFER_STENCIL)

      idx = BUFFER_DEPTH;

   switch (idx) {

   case BUFFER_DEPTH:

      format = stfb->iface->visual->depth_stencil_format;

      sw = FALSE;

      break;

   case BUFFER_ACCUM:

      format = stfb->iface->visual->accum_format;

      sw = TRUE;

      break;

   default:

      format = stfb->iface->visual->color_format;

      sw = FALSE;

      break;

   }

   if (format == PIPE_FORMAT_NONE)

      return FALSE;

   rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);

   if (!rb)

      return FALSE;

   if (idx != BUFFER_DEPTH) {

      _mesa_add_renderbuffer(&stfb->Base, idx, rb);

   }

   else {

      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))

         _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);

      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))

         _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);

   }

   return TRUE;

}

/**

 * Intialize a struct gl_config from a visual.

 */

static void

st_visual_to_context_mode(const struct st_visual *visual,

                          struct gl_config *mode)

{

   memset(mode, 0, sizeof(*mode));

   if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))

      mode->doubleBufferMode = GL_TRUE;

   if (st_visual_have_buffers(visual,

            ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))

      mode->stereoMode = GL_TRUE;

   if (visual->color_format != PIPE_FORMAT_NONE) {

      mode->rgbMode = GL_TRUE;

      mode->redBits =

         util_format_get_component_bits(visual->color_format,

               UTIL_FORMAT_COLORSPACE_RGB, 0);

      mode->greenBits =

         util_format_get_component_bits(visual->color_format,

               UTIL_FORMAT_COLORSPACE_RGB, 1);

      mode->blueBits =

         util_format_get_component_bits(visual->color_format,

               UTIL_FORMAT_COLORSPACE_RGB, 2);

      mode->alphaBits =

         util_format_get_component_bits(visual->color_format,

               UTIL_FORMAT_COLORSPACE_RGB, 3);

      mode->rgbBits = mode->redBits +

         mode->greenBits + mode->blueBits + mode->alphaBits;

   }

   if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {

      mode->depthBits =

         util_format_get_component_bits(visual->depth_stencil_format,

               UTIL_FORMAT_COLORSPACE_ZS, 0);

      mode->stencilBits =

         util_format_get_component_bits(visual->depth_stencil_format,

               UTIL_FORMAT_COLORSPACE_ZS, 1);

      mode->haveDepthBuffer = mode->depthBits > 0;

      mode->haveStencilBuffer = mode->stencilBits > 0;

   }

   if (visual->accum_format != PIPE_FORMAT_NONE) {

      mode->haveAccumBuffer = GL_TRUE;

      mode->accumRedBits =

         util_format_get_component_bits(visual->accum_format,

               UTIL_FORMAT_COLORSPACE_RGB, 0);

      mode->accumGreenBits =

         util_format_get_component_bits(visual->accum_format,

               UTIL_FORMAT_COLORSPACE_RGB, 1);

      mode->accumBlueBits =

         util_format_get_component_bits(visual->accum_format,

               UTIL_FORMAT_COLORSPACE_RGB, 2);

      mode->accumAlphaBits =

         util_format_get_component_bits(visual->accum_format,

               UTIL_FORMAT_COLORSPACE_RGB, 3);

   }

   if (visual->samples > 1) {

      mode->sampleBuffers = 1;

      mode->samples = visual->samples;

   }

}

/**

 * Create a framebuffer from a manager interface.

 */

static struct st_framebuffer *

st_framebuffer_create(struct st_framebuffer_iface *stfbi)

{

   struct st_framebuffer *stfb;

   struct gl_config mode;

   gl_buffer_index idx;

   if (!stfbi)

      return NULL;

   stfb = CALLOC_STRUCT(st_framebuffer);

   if (!stfb)

      return NULL;

   st_visual_to_context_mode(stfbi->visual, &mode);

   _mesa_initialize_window_framebuffer(&stfb->Base, &mode);

   stfb->iface = stfbi;

   stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;

   /* add the color buffer */

   idx = stfb->Base._ColorDrawBufferIndexes[0];

   if (!st_framebuffer_add_renderbuffer(stfb, idx)) {

      free(stfb);

      return NULL;

   }

   st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);

   st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);

   stfb->stamp = 0;

   st_framebuffer_update_attachments(stfb);

   return stfb;

}

/**

 * Reference a framebuffer.

 */

static void

st_framebuffer_reference(struct st_framebuffer **ptr,

                         struct st_framebuffer *stfb)

{

   struct gl_framebuffer *fb = &stfb->Base;

   _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);

}

static void

st_context_flush(struct st_context_iface *stctxi, unsigned flags,

                 struct pipe_fence_handle **fence)

{

   struct st_context *st = (struct st_context *) stctxi;

   unsigned pipe_flags = 0;

   if (flags & ST_FLUSH_END_OF_FRAME) {

      pipe_flags |= PIPE_FLUSH_END_OF_FRAME;

   }

   st_flush(st, fence, pipe_flags);

   if (flags & ST_FLUSH_FRONT)

      st_manager_flush_frontbuffer(st);

}

static boolean

st_context_teximage(struct st_context_iface *stctxi,

                    enum st_texture_type tex_type,

                    int level, enum pipe_format pipe_format,

                    struct pipe_resource *tex, boolean mipmap)

{

   struct st_context *st = (struct st_context *) stctxi;

   struct gl_context *ctx = st->ctx;

   struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);

   struct gl_texture_object *texObj;

   struct gl_texture_image *texImage;

   struct st_texture_object *stObj;

   struct st_texture_image *stImage;

   GLenum internalFormat;

   GLuint width, height, depth;

   GLenum target;

   switch (tex_type) {

   case ST_TEXTURE_1D:

      target = GL_TEXTURE_1D;

      break;

   case ST_TEXTURE_2D:

      target = GL_TEXTURE_2D;

      break;

   case ST_TEXTURE_3D:

      target = GL_TEXTURE_3D;

      break;

   case ST_TEXTURE_RECT:

      target = GL_TEXTURE_RECTANGLE_ARB;

      break;

   default:

      return FALSE;

   }

   texObj = _mesa_select_tex_object(ctx, texUnit, target);

   _mesa_lock_texture(ctx, texObj);

   stObj = st_texture_object(texObj);

   /* switch to surface based */

   if (!stObj->surface_based) {

      _mesa_clear_texture_object(ctx, texObj);

      stObj->surface_based = GL_TRUE;

   }

   texImage = _mesa_get_tex_image(ctx, texObj, target, level);

   stImage = st_texture_image(texImage);

   if (tex) {

      gl_format texFormat = st_pipe_format_to_mesa_format(pipe_format);

      if (util_format_has_alpha(tex->format))

         internalFormat = GL_RGBA;

      else

         internalFormat = GL_RGB;

      _mesa_init_teximage_fields(ctx, texImage,

                                 tex->width0, tex->height0, 1, 0,

                                 internalFormat, texFormat);

      width = tex->width0;

      height = tex->height0;

      depth = tex->depth0;

      /* grow the image size until we hit level = 0 */

      while (level > 0) {

         if (width != 1)

            width <<= 1;

         if (height != 1)

            height <<= 1;

         if (depth != 1)

            depth <<= 1;

         level--;

      }

   }

   else {

      _mesa_clear_texture_image(ctx, texImage);

      width = height = depth = 0;

   }

   pipe_resource_reference(&stImage->pt, tex);

   stObj->width0 = width;

   stObj->height0 = height;

   stObj->depth0 = depth;

   stObj->surface_format = pipe_format;

   _mesa_dirty_texobj(ctx, texObj, GL_TRUE);

   _mesa_unlock_texture(ctx, texObj);

   return TRUE;

}

static void

st_context_copy(struct st_context_iface *stctxi,

                struct st_context_iface *stsrci, unsigned mask)

{

   struct st_context *st = (struct st_context *) stctxi;

   struct st_context *src = (struct st_context *) stsrci;

   _mesa_copy_context(src->ctx, st->ctx, mask);

}

static boolean

st_context_share(struct st_context_iface *stctxi,

                 struct st_context_iface *stsrci)

{

   struct st_context *st = (struct st_context *) stctxi;

   struct st_context *src = (struct st_context *) stsrci;

   return _mesa_share_state(st->ctx, src->ctx);

}

static void

st_context_destroy(struct st_context_iface *stctxi)

{

   struct st_context *st = (struct st_context *) stctxi;

   st_destroy_context(st);

}

static struct st_context_iface *

st_api_create_context(struct st_api *stapi, struct st_manager *smapi,

                      const struct st_context_attribs *attribs,

                      enum st_context_error *error,

                      struct st_context_iface *shared_stctxi)

{

   struct st_context *shared_ctx = (struct st_context *) shared_stctxi;

   struct st_context *st;

   struct pipe_context *pipe;

   struct gl_config mode;

   gl_api api;

   if (!(stapi->profile_mask & (1 << attribs->profile)))

      return NULL;

   switch (attribs->profile) {

   case ST_PROFILE_DEFAULT:

      api = API_OPENGL_COMPAT;

      break;

   case ST_PROFILE_OPENGL_ES1:

      api = API_OPENGLES;

      break;

   case ST_PROFILE_OPENGL_ES2:

      api = API_OPENGLES2;

      break;

   case ST_PROFILE_OPENGL_CORE:

      api = API_OPENGL_CORE;

      break;

   default:

      *error = ST_CONTEXT_ERROR_BAD_API;

      return NULL;

      break;

   }

   pipe = smapi->screen->context_create(smapi->screen, NULL);

   if (!pipe) {

      *error = ST_CONTEXT_ERROR_NO_MEMORY;

      return NULL;

   }

   st_visual_to_context_mode(&attribs->visual, &mode);

   st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);

   if (!st) {

      *error = ST_CONTEXT_ERROR_NO_MEMORY;

      pipe->destroy(pipe);

      return NULL;

   }

   if (attribs->flags & ST_CONTEXT_FLAG_DEBUG)

      st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;

   if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)

      st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;

#if 0

   /* need to perform version check */

   if (attribs->major > 1 || attribs->minor > 0) {

      /* Is the actual version less than the requested version?

       */

      if (st->ctx->Version < attribs->major * 10 + attribs->minor) {

	 *error = ST_CONTEXT_ERROR_BAD_VERSION;

         st_destroy_context(st);

         return NULL;

      }

   }

#endif

   st->invalidate_on_gl_viewport =

      smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);

   st->iface.destroy = st_context_destroy;

   st->iface.flush = st_context_flush;

   st->iface.teximage = st_context_teximage;

   st->iface.copy = st_context_copy;

   st->iface.share = st_context_share;

   st->iface.st_context_private = (void *) smapi;

   st->iface.cso_context = st->cso_context;

   st->iface.pipe = st->pipe;

   *error = ST_CONTEXT_SUCCESS;

   return &st->iface;

}

static struct st_context_iface *

st_api_get_current(struct st_api *stapi)

{

   GET_CURRENT_CONTEXT(ctx);

   struct st_context *st = (ctx) ? ctx->st : NULL;

   return (st) ? &st->iface : NULL;

}

static struct st_framebuffer *

st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,

                               struct st_framebuffer_iface *stfbi)

{

   struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;

   /* dummy framebuffers cant be used as st_framebuffer */

   if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&

       cur->iface == stfbi) {

      /* reuse the current stfb */

      st_framebuffer_reference(&stfb, cur);

   }

   else {

      /* create a new one */

      stfb = st_framebuffer_create(stfbi);

   }

   return stfb;

}

static boolean

st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,

                    struct st_framebuffer_iface *stdrawi,

                    struct st_framebuffer_iface *streadi)

{

   struct st_context *st = (struct st_context *) stctxi;

   struct st_framebuffer *stdraw, *stread;

   boolean ret;

   _glapi_check_multithread();

   if (st) {

      /* reuse or create the draw fb */

      stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,

                                              stdrawi);

      if (streadi != stdrawi) {

         /* do the same for the read fb */

         stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,

                                                 streadi);

      }

      else {

         stread = NULL;

         /* reuse the draw fb for the read fb */

         if (stdraw)

            st_framebuffer_reference(&stread, stdraw);

      }

      if (stdraw && stread) {

         st_framebuffer_validate(stdraw, st);

         if (stread != stdraw)

            st_framebuffer_validate(stread, st);

         ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);

         st->draw_stamp = stdraw->stamp - 1;

         st->read_stamp = stread->stamp - 1;

         st_context_validate(st, stdraw, stread);

      }

      else {

         struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();

         ret = _mesa_make_current(st->ctx, incomplete, incomplete);

      }

      st_framebuffer_reference(&stdraw, NULL);

      st_framebuffer_reference(&stread, NULL);

   }

   else {

      ret = _mesa_make_current(NULL, NULL, NULL);

   }

   return ret;

}

static st_proc_t

st_api_get_proc_address(struct st_api *stapi, const char *procname)

{

   return (st_proc_t) _glapi_get_proc_address(procname);

}

static void

st_api_destroy(struct st_api *stapi)

{

}

/**

 * Flush the front buffer if the current context renders to the front buffer.

 */

void

st_manager_flush_frontbuffer(struct st_context *st)

{

   struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);

   struct st_renderbuffer *strb = NULL;

   if (stfb)

      strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);

   if (!strb)

      return;

   /* never a dummy fb */

   assert(&stfb->Base != _mesa_get_incomplete_framebuffer());

   stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);

}

/**

 * Return the surface of an EGLImage.

 * FIXME: I think this should operate on resources, not surfaces

 */

struct pipe_surface *

st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)

{

   struct st_manager *smapi =

      (struct st_manager *) st->iface.st_context_private;

   struct st_egl_image stimg;

   struct pipe_surface *ps, surf_tmpl;

   if (!smapi || !smapi->get_egl_image)

      return NULL;

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

   if (!smapi->get_egl_image(smapi, eglimg, &stimg))

      return NULL;

   u_surface_default_template(&surf_tmpl, stimg.texture);

   surf_tmpl.u.tex.level = stimg.level;

   surf_tmpl.u.tex.first_layer = stimg.layer;

   surf_tmpl.u.tex.last_layer = stimg.layer;

   ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);

   pipe_resource_reference(&stimg.texture, NULL);

   return ps;

}

/**

 * Re-validate the framebuffers.

 */

void

st_manager_validate_framebuffers(struct st_context *st)

{

   struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);

   struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);

   if (stdraw)

      st_framebuffer_validate(stdraw, st);

   if (stread && stread != stdraw)

      st_framebuffer_validate(stread, st);

   st_context_validate(st, stdraw, stread);

}

/**

 * Add a color renderbuffer on demand.

 */

boolean

st_manager_add_color_renderbuffer(struct st_context *st,

                                  struct gl_framebuffer *fb,

                                  gl_buffer_index idx)

{

   struct st_framebuffer *stfb = st_ws_framebuffer(fb);

   /* FBO */

   if (!stfb)

      return FALSE;

   if (stfb->Base.Attachment[idx].Renderbuffer)

      return TRUE;

   switch (idx) {

   case BUFFER_FRONT_LEFT:

   case BUFFER_BACK_LEFT:

   case BUFFER_FRONT_RIGHT:

   case BUFFER_BACK_RIGHT:

      break;

   default:

      return FALSE;

      break;

   }

   if (!st_framebuffer_add_renderbuffer(stfb, idx))

      return FALSE;

   st_framebuffer_update_attachments(stfb);

   /*

    * Force a call to the state tracker manager to validate the

    * new renderbuffer. It might be that there is a window system

    * renderbuffer available.

    */

   if(stfb->iface)

      stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;

   st_invalidate_state(st->ctx, _NEW_BUFFERS);

   return TRUE;

}

static const struct st_api st_gl_api = {

   "Mesa " PACKAGE_VERSION,

   ST_API_OPENGL,

   ST_PROFILE_DEFAULT_MASK |

   ST_PROFILE_OPENGL_CORE_MASK |

   ST_PROFILE_OPENGL_ES1_MASK |

   ST_PROFILE_OPENGL_ES2_MASK |

   0,

   ST_API_FEATURE_MS_VISUALS_MASK,

   st_api_destroy,

   st_api_get_proc_address,

   st_api_create_context,

   st_api_make_current,

   st_api_get_current,

};

struct st_api *

st_gl_api_create(void)

{

   return (struct st_api *) &st_gl_api;

}