/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 TUNGSTEN GRAPHICS 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.
 * 
 **************************************************************************/

#include "main/imports.h"
#include "main/accum.h"
#include "main/context.h"
#include "main/samplerobj.h"
#include "main/shaderobj.h"
#include "program/prog_cache.h"
#include "vbo/vbo.h"
#include "glapi/glapi.h"
#include "st_context.h"
#include "st_debug.h"
#include "st_cb_bitmap.h"
#include "st_cb_blit.h"
#include "st_cb_bufferobjects.h"
#include "st_cb_clear.h"
#include "st_cb_condrender.h"
#include "st_cb_drawpixels.h"
#include "st_cb_rasterpos.h"
#include "st_cb_drawtex.h"
#include "st_cb_eglimage.h"
#include "st_cb_fbo.h"
#include "st_cb_feedback.h"
#include "st_cb_program.h"
#include "st_cb_queryobj.h"
#include "st_cb_readpixels.h"
#include "st_cb_texture.h"
#include "st_cb_xformfb.h"
#include "st_cb_flush.h"
#include "st_cb_syncobj.h"
#include "st_cb_strings.h"
#include "st_cb_texturebarrier.h"
#include "st_cb_viewport.h"
#include "st_atom.h"
#include "st_draw.h"
#include "st_extensions.h"
#include "st_gen_mipmap.h"
#include "st_program.h"
#include "pipe/p_context.h"
#include "util/u_inlines.h"
#include "util/u_upload_mgr.h"
#include "cso_cache/cso_context.h"
#include "util/u_vbuf.h"


DEBUG_GET_ONCE_BOOL_OPTION(mesa_mvp_dp4, "MESA_MVP_DP4", FALSE)


/**
 * Called via ctx->Driver.UpdateState()
 */
void st_invalidate_state(struct gl_context * ctx, GLuint new_state)
{
   struct st_context *st = st_context(ctx);

   /* Replace _NEW_FRAG_CLAMP with ST_NEW_FRAGMENT_PROGRAM for the fallback. */
   if (st->clamp_frag_color_in_shader && (new_state & _NEW_FRAG_CLAMP)) {
      new_state &= ~_NEW_FRAG_CLAMP;
      st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
   }

   /* Update the vertex shader if ctx->Light._ClampVertexColor was changed. */
   if (st->clamp_vert_color_in_shader && (new_state & _NEW_LIGHT)) {
      st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
   }

   st->dirty.mesa |= new_state;
   st->dirty.st |= ST_NEW_MESA;

   /* This is the only core Mesa module we depend upon.
    * No longer use swrast, swsetup, tnl.
    */
   _vbo_InvalidateState(ctx, new_state);
}


/**
 * Check for multisample env var override.
 */
int
st_get_msaa(void)
{
   const char *msaa = _mesa_getenv("__GL_FSAA_MODE");
   if (msaa)
      return atoi(msaa);
   return 0;
}


static void st_init_vbuf(struct st_context *st)
{
   struct u_vbuf_caps caps;

   u_vbuf_get_caps(st->pipe->screen, &caps);

   /* Create u_vbuf if there is anything unsupported. */
   if (!caps.buffer_offset_unaligned ||
       !caps.buffer_stride_unaligned ||
       !caps.velem_src_offset_unaligned ||
       !caps.format_fixed32 ||
       !caps.format_float16 ||
       !caps.format_float64 ||
       !caps.format_norm32 ||
       !caps.format_scaled32 ||
       !caps.user_vertex_buffers) {
      /* XXX user vertex buffers are always uploaded regardless of the CAP. */
      st->vbuf = u_vbuf_create(st->pipe, &caps);
      cso_install_vbuf(st->cso_context, st->vbuf);
   }
}


static struct st_context *
st_create_context_priv( struct gl_context *ctx, struct pipe_context *pipe )
{
   struct pipe_screen *screen = pipe->screen;
   uint i;
   struct st_context *st = ST_CALLOC_STRUCT( st_context );
   
   ctx->st = st;

   st->ctx = ctx;
   st->pipe = pipe;

   /* XXX: this is one-off, per-screen init: */
   st_debug_init();
   
   /* state tracker needs the VBO module */
   _vbo_CreateContext(ctx);

   st->dirty.mesa = ~0;
   st->dirty.st = ~0;

   st->uploader = u_upload_create(st->pipe, 65536, 4, PIPE_BIND_VERTEX_BUFFER);

   if (!screen->get_param(screen, PIPE_CAP_USER_INDEX_BUFFERS)) {
      st->indexbuf_uploader = u_upload_create(st->pipe, 128 * 1024, 4,
                                              PIPE_BIND_INDEX_BUFFER);
   }

   st->cso_context = cso_create_context(pipe);

   st_init_vbuf(st);
   st_init_atoms( st );
   st_init_bitmap(st);
   st_init_clear(st);
   st_init_draw( st );
   st_init_generate_mipmap(st);
   st_init_blit(st);

   if(pipe->screen->get_param(pipe->screen, PIPE_CAP_NPOT_TEXTURES))
      st->internal_target = PIPE_TEXTURE_2D;
   else
      st->internal_target = PIPE_TEXTURE_RECT;

   for (i = 0; i < 3; i++) {
      memset(&st->velems_util_draw[i], 0, sizeof(struct pipe_vertex_element));
      st->velems_util_draw[i].src_offset = i * 4 * sizeof(float);
      st->velems_util_draw[i].instance_divisor = 0;
      st->velems_util_draw[i].vertex_buffer_index = 0;
      st->velems_util_draw[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
   }

   /* we want all vertex data to be placed in buffer objects */
   vbo_use_buffer_objects(ctx);


   /* make sure that no VBOs are left mapped when we're drawing. */
   vbo_always_unmap_buffers(ctx);

   /* Need these flags:
    */
   st->ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;

   st->ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;

   st->pixel_xfer.cache = _mesa_new_program_cache();

   st->force_msaa = st_get_msaa();

   /* GL limits and extensions */
   st_init_limits(st);
   st_init_extensions(st);

   return st;
}


struct st_context *st_create_context(gl_api api, struct pipe_context *pipe,
                                     const struct gl_config *visual,
                                     struct st_context *share)
{
   struct gl_context *ctx;
   struct gl_context *shareCtx = share ? share->ctx : NULL;
   struct dd_function_table funcs;

   /* Sanity checks */
   assert(MESA_SHADER_VERTEX == PIPE_SHADER_VERTEX);
   assert(MESA_SHADER_FRAGMENT == PIPE_SHADER_FRAGMENT);
   assert(MESA_SHADER_GEOMETRY == PIPE_SHADER_GEOMETRY);

   memset(&funcs, 0, sizeof(funcs));
   st_init_driver_functions(&funcs);

   ctx = _mesa_create_context(api, visual, shareCtx, &funcs, NULL);
   if (!ctx) {
      return NULL;
   }

   /* XXX: need a capability bit in gallium to query if the pipe
    * driver prefers DP4 or MUL/MAD for vertex transformation.
    */
   if (debug_get_option_mesa_mvp_dp4())
      _mesa_set_mvp_with_dp4( ctx, GL_TRUE );

   return st_create_context_priv(ctx, pipe);
}


static void st_destroy_context_priv( struct st_context *st )
{
   uint i;

   st_destroy_atoms( st );
   st_destroy_draw( st );
   st_destroy_generate_mipmap(st);
   st_destroy_blit(st);
   st_destroy_clear(st);
   st_destroy_bitmap(st);
   st_destroy_drawpix(st);
   st_destroy_drawtex(st);

   /* Unreference any user vertex buffers. */
   for (i = 0; i < st->num_user_attribs; i++) {
      pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
   }

   for (i = 0; i < Elements(st->state.sampler_views); i++) {
      pipe_sampler_view_reference(&st->state.sampler_views[i], NULL);
   }

   if (st->default_texture) {
      st->ctx->Driver.DeleteTexture(st->ctx, st->default_texture);
      st->default_texture = NULL;
   }

   u_upload_destroy(st->uploader);
   if (st->indexbuf_uploader) {
      u_upload_destroy(st->indexbuf_uploader);
   }
   free( st );
}

 
void st_destroy_context( struct st_context *st )
{
   struct pipe_context *pipe = st->pipe;
   struct u_vbuf *vbuf = st->vbuf;
   struct cso_context *cso = st->cso_context;
   struct gl_context *ctx = st->ctx;
   GLuint i;

   /* need to unbind and destroy CSO objects before anything else */
   cso_release_all(st->cso_context);

   st_reference_fragprog(st, &st->fp, NULL);
   st_reference_vertprog(st, &st->vp, NULL);

   /* release framebuffer surfaces */
   for (i = 0; i < PIPE_MAX_COLOR_BUFS; i++) {
      pipe_surface_reference(&st->state.framebuffer.cbufs[i], NULL);
   }
   pipe_surface_reference(&st->state.framebuffer.zsbuf, NULL);

   pipe->set_index_buffer(pipe, NULL);

   for (i = 0; i < PIPE_SHADER_TYPES; i++) {
      pipe->set_constant_buffer(pipe, i, 0, NULL);
   }

   _mesa_delete_program_cache(st->ctx, st->pixel_xfer.cache);

   _vbo_DestroyContext(st->ctx);

   st_destroy_program_variants(st);

   _mesa_free_context_data(ctx);

   /* This will free the st_context too, so 'st' must not be accessed
    * afterwards. */
   st_destroy_context_priv(st);
   st = NULL;

   if (vbuf)
      u_vbuf_destroy(vbuf);

   cso_destroy_context(cso);

   pipe->destroy( pipe );

   free(ctx);
}


void st_init_driver_functions(struct dd_function_table *functions)
{
   _mesa_init_shader_object_functions(functions);
   _mesa_init_sampler_object_functions(functions);

   functions->Accum = _mesa_accum;

   st_init_blit_functions(functions);
   st_init_bufferobject_functions(functions);
   st_init_clear_functions(functions);
   st_init_bitmap_functions(functions);
   st_init_drawpixels_functions(functions);
   st_init_rasterpos_functions(functions);

   st_init_drawtex_functions(functions);

   st_init_eglimage_functions(functions);

   st_init_fbo_functions(functions);
   st_init_feedback_functions(functions);
   st_init_program_functions(functions);
   st_init_query_functions(functions);
   st_init_cond_render_functions(functions);
   st_init_readpixels_functions(functions);
   st_init_texture_functions(functions);
   st_init_texture_barrier_functions(functions);
   st_init_flush_functions(functions);
   st_init_string_functions(functions);
   st_init_viewport_functions(functions);

   st_init_xformfb_functions(functions);
   st_init_syncobj_functions(functions);

   functions->UpdateState = st_invalidate_state;
}