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/*

 * Mesa 3-D graphics library

 * Version:  7.9

 *

 * 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 "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"

#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"

/**

 * 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 */

   return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : 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;

}

/**

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

 */

static void

st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)

{

   struct pipe_context *pipe = st->pipe;

   struct pipe_resource *textures[ST_ATTACHMENT_COUNT];

   uint width, height;

   unsigned i;

   boolean changed = FALSE;

   if (!p_atomic_read(&stfb->revalidate))

      return;

   /* validate the fb */

   if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))

      return;

   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;

      }

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

      u_surface_default_template(&surf_tmpl, textures[i],

                                 PIPE_BIND_RENDER_TARGET);

      ps = pipe->create_surface(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) {

      st->dirty.st |= ST_NEW_FRAMEBUFFER;

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

      assert(stfb->Base.Width == width);

      assert(stfb->Base.Height == height);

   }

   p_atomic_set(&stfb->revalidate, FALSE);

}

/**

 * 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;

   }

   p_atomic_set(&stfb->revalidate, TRUE);

}

/**

 * 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;

   int samples;

   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;

   samples = stfb->iface->visual->samples;

   if (!samples)

      samples = st_get_msaa();

   rb = st_new_renderbuffer_fb(format, 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) {

      mode->sampleBuffers = 1;

      mode->samples = visual->samples;

   }

}

/**

 * Determine the default draw or read buffer from a visual.

 */

static void

st_visual_to_default_buffer(const struct st_visual *visual,

                            GLenum *buffer, GLint *index)

{

   enum st_attachment_type statt;

   GLenum buf;

   gl_buffer_index idx;

   statt = visual->render_buffer;

   /* do nothing if an invalid render buffer is specified */

   if (statt == ST_ATTACHMENT_INVALID ||

       !st_visual_have_buffers(visual, 1 << statt))

      return;

   switch (statt) {

   case ST_ATTACHMENT_FRONT_LEFT:

      buf = GL_FRONT_LEFT;

      idx = BUFFER_FRONT_LEFT;

      break;

   case ST_ATTACHMENT_BACK_LEFT:

      buf = GL_BACK_LEFT;

      idx = BUFFER_BACK_LEFT;

      break;

   case ST_ATTACHMENT_FRONT_RIGHT:

      buf = GL_FRONT_RIGHT;

      idx = BUFFER_FRONT_RIGHT;

      break;

   case ST_ATTACHMENT_BACK_RIGHT:

      buf = GL_BACK_RIGHT;

      idx = BUFFER_BACK_RIGHT;

      break;

   default:

      buf = GL_NONE;

      idx = BUFFER_COUNT;

      break;

   }

   if (buf != GL_NONE) {

      if (buffer)

         *buffer = buf;

      if (index)

         *index = idx;

   }

}

/**

 * 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;

   stfb = CALLOC_STRUCT(st_framebuffer);

   if (!stfb)

      return NULL;

   /* for FBO-only context */

   if (!stfbi) {

      struct gl_framebuffer *base = _mesa_get_incomplete_framebuffer();

      stfb->Base = *base;

      return stfb;

   }

   st_visual_to_context_mode(stfbi->visual, &mode);

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

   /* modify the draw/read buffers of the fb */

   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],

         &stfb->Base._ColorDrawBufferIndexes[0]);

   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,

         &stfb->Base._ColorReadBufferIndex);

   stfb->iface = stfbi;

   /* 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);

   st_framebuffer_update_attachments(stfb);

   stfb->Base.Initialized = GL_TRUE;

   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_notify_invalid_framebuffer(struct st_context_iface *stctxi,

                                      struct st_framebuffer_iface *stfbi)

{

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

   struct st_framebuffer *stfb;

   /* either draw or read winsys fb */

   stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);

   if (!stfb || stfb->iface != stfbi)

      stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);

   if (stfb && stfb->iface == stfbi) {

      p_atomic_set(&stfb->revalidate, TRUE);

   }

   else {

      /* This function is probably getting called when we've detected a

       * change in a window's size but the currently bound context is

       * not bound to that window.

       * If the st_framebuffer_iface structure had a pointer to the

       * corresponding st_framebuffer we'd be able to handle this.

       */

   }

}

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;

   st_flush(st, flags, fence);

   if (flags & PIPE_FLUSH_RENDER_CACHE)

      st_manager_flush_frontbuffer(st);

}

static boolean

st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,

                    int level, enum pipe_format internal_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;

   switch (target) {

   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;

      break;

   }

   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;

      /*

       * XXX When internal_format and tex->format differ, st_finalize_texture

       * needs to allocate a new texture with internal_format and copy the

       * texture here into the new one.  It will result in surface_copy being

       * called on surfaces whose formats differ.

       *

       * To avoid that, internal_format is (wrongly) ignored here.  A sane fix

       * is to use a sampler view.

       */

      if (!st_sampler_compat_formats(tex->format, internal_format))

	 internal_format = tex->format;

      if (util_format_get_component_bits(internal_format,

               UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)

         internalFormat = GL_RGBA;

      else

         internalFormat = GL_RGB;

      texFormat = st_ChooseTextureFormat(ctx, internalFormat,

                                         GL_RGBA, GL_UNSIGNED_BYTE);

      _mesa_init_teximage_fields(ctx, target, 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;

   _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,

                      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;

      break;

   case ST_PROFILE_OPENGL_ES1:

      api = API_OPENGLES;

      break;

   case ST_PROFILE_OPENGL_ES2:

      api = API_OPENGLES2;

      break;

   case ST_PROFILE_OPENGL_CORE:

   default:

      return NULL;

      break;

   }

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

   if (!pipe)

      return NULL;

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

   st = st_create_context(api, pipe, &mode, shared_ctx);

   if (!st) {

      pipe->destroy(pipe);

      return NULL;

   }

   /* need to perform version check */

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

      _mesa_compute_version(st->ctx);

      if (st->ctx->VersionMajor < attribs->major ||

          st->ctx->VersionMajor < attribs->minor) {

         st_destroy_context(st);

         return NULL;

      }

   }

   st->invalidate_on_gl_viewport =

      smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);

   st->iface.destroy = st_context_destroy;

   st->iface.notify_invalid_framebuffer =

      st_context_notify_invalid_framebuffer;

   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;

   return &st->iface;

}

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, *stfb;

   boolean ret;

   _glapi_check_multithread();

   if (st) {

      /* reuse/create the draw fb */

      stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);

      if (stfb && stfb->iface == stdrawi) {

         stdraw = NULL;

         st_framebuffer_reference(&stdraw, stfb);

      }

      else {

         stdraw = st_framebuffer_create(stdrawi);

      }

      /* reuse/create the read fb */

      stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);

      if (!stfb || stfb->iface != streadi)

         stfb = stdraw;

      if (stfb && stfb->iface == streadi) {

         stread = NULL;

         st_framebuffer_reference(&stread, stfb);

      }

      else {

         stread = st_framebuffer_create(streadi);

      }

      if (stdraw && stread) {

         st_framebuffer_validate(stdraw, st);

         if (stread != stdraw)

            st_framebuffer_validate(stread, st);

         /* modify the draw/read buffers of the context */

         if (stdraw->iface) {

            st_visual_to_default_buffer(stdraw->iface->visual,

                  &st->ctx->Color.DrawBuffer[0], NULL);

         }

         if (stread->iface) {

            st_visual_to_default_buffer(stread->iface->visual,

                  &st->ctx->Pixel.ReadBuffer, NULL);

         }

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

      }

      else {

         ret = FALSE;

      }

      st_framebuffer_reference(&stdraw, NULL);

      st_framebuffer_reference(&stread, NULL);

   }

   else {

      ret = _mesa_make_current(NULL, NULL, NULL);

   }

   return ret;

}

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 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->iface);

   stfb->iface->flush_front(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, unsigned usage)

{

   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;

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

   surf_tmpl.format = stimg.texture->format;

   surf_tmpl.usage = usage;

   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);

}

/**

 * 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);

   st_invalidate_state(st->ctx, _NEW_BUFFERS);

   return TRUE;

}

static const struct st_api st_gl_api = {

   "Mesa " MESA_VERSION_STRING,

   ST_API_OPENGL,

#if FEATURE_GL

   ST_PROFILE_DEFAULT_MASK |

#endif

#if FEATURE_ES1

   ST_PROFILE_OPENGL_ES1_MASK |

#endif

#if FEATURE_ES2

   ST_PROFILE_OPENGL_ES2_MASK |

#endif

   0,

   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;

}