/**************************************************************************
 * 
 * Copyright 2003 VMware, Inc.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

 /*
  * Authors:
  *   Keith Whitwell <keithw@vmware.com>
  */

#include "main/glheader.h"
#include "main/macros.h"
#include "main/enums.h"
#include "main/shaderapi.h"
#include "program/prog_instruction.h"
#include "program/program.h"

#include "cso_cache/cso_context.h"
#include "draw/draw_context.h"

#include "st_context.h"
#include "st_debug.h"
#include "st_program.h"
#include "st_cb_program.h"
#include "st_glsl_to_ir.h"
#include "st_atifs_to_nir.h"
#include "st_util.h"


/**
 * Called via ctx->Driver.NewProgram() to allocate a new vertex or
 * fragment program.
 */
static struct gl_program *
st_new_program(struct gl_context *ctx, gl_shader_stage stage, GLuint id,
               bool is_arb_asm)
{
   struct st_program *prog;

   switch (stage) {
   case MESA_SHADER_VERTEX:
      prog = (struct st_program*)rzalloc(NULL, struct st_vertex_program);
      break;
   default:
      prog = rzalloc(NULL, struct st_program);
      break;
   }

   return _mesa_init_gl_program(&prog->Base, stage, id, is_arb_asm);
}


/**
 * Called via ctx->Driver.DeleteProgram()
 */
static void
st_delete_program(struct gl_context *ctx, struct gl_program *prog)
{
   struct st_context *st = st_context(ctx);
   struct st_program *stp = st_program(prog);

   st_release_variants(st, stp);

   if (stp->glsl_to_tgsi)
      free_glsl_to_tgsi_visitor(stp->glsl_to_tgsi);

   free(stp->serialized_nir);

   /* delete base class */
   _mesa_delete_program( ctx, prog );
}

/**
 * Called via ctx->Driver.ProgramStringNotify()
 * Called when the program's text/code is changed.  We have to free
 * all shader variants and corresponding gallium shaders when this happens.
 */
static GLboolean
st_program_string_notify( struct gl_context *ctx,
                                           GLenum target,
                                           struct gl_program *prog )
{
   struct st_context *st = st_context(ctx);
   struct st_program *stp = (struct st_program *) prog;

   /* GLSL-to-NIR should not end up here. */
   assert(!stp->shader_program);

   st_release_variants(st, stp);

   if (target == GL_FRAGMENT_PROGRAM_ARB ||
       target == GL_FRAGMENT_SHADER_ATI) {
      if (target == GL_FRAGMENT_SHADER_ATI) {
         assert(stp->ati_fs);
         assert(stp->ati_fs->Program == prog);

         st_init_atifs_prog(ctx, prog);
      }

      if (!st_translate_fragment_program(st, stp))
         return false;
   } else if (target == GL_VERTEX_PROGRAM_ARB) {
      if (!st_translate_vertex_program(st, stp))
         return false;
   } else {
      if (!st_translate_common_program(st, stp))
         return false;
   }

   st_finalize_program(st, prog);
   return GL_TRUE;
}

/**
 * Called via ctx->Driver.NewATIfs()
 * Called in glEndFragmentShaderATI()
 */
static struct gl_program *
st_new_ati_fs(struct gl_context *ctx, struct ati_fragment_shader *curProg)
{
   struct gl_program *prog = ctx->Driver.NewProgram(ctx, MESA_SHADER_FRAGMENT,
         curProg->Id, true);
   struct st_program *stfp = (struct st_program *)prog;
   stfp->ati_fs = curProg;
   return prog;
}

static void
st_max_shader_compiler_threads(struct gl_context *ctx, unsigned count)
{
   struct pipe_screen *screen = st_context(ctx)->screen;

   if (screen->set_max_shader_compiler_threads)
      screen->set_max_shader_compiler_threads(screen, count);
}

static bool
st_get_shader_program_completion_status(struct gl_context *ctx,
                                        struct gl_shader_program *shprog)
{
   struct pipe_screen *screen = st_context(ctx)->screen;

   if (!screen->is_parallel_shader_compilation_finished)
      return true;

   for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
      struct gl_linked_shader *linked = shprog->_LinkedShaders[i];
      void *sh = NULL;

      if (!linked || !linked->Program)
         continue;

      if (st_program(linked->Program)->variants)
         sh = st_program(linked->Program)->variants->driver_shader;

      unsigned type = pipe_shader_type_from_mesa(i);

      if (sh &&
          !screen->is_parallel_shader_compilation_finished(screen, sh, type))
         return false;
   }
   return true;
}

/**
 * Plug in the program and shader-related device driver functions.
 */
void
st_init_program_functions(struct dd_function_table *functions)
{
   functions->NewProgram = st_new_program;
   functions->DeleteProgram = st_delete_program;
   functions->ProgramStringNotify = st_program_string_notify;
   functions->NewATIfs = st_new_ati_fs;
   functions->LinkShader = st_link_shader;
   functions->SetMaxShaderCompilerThreads = st_max_shader_compiler_threads;
   functions->GetShaderProgramCompletionStatus =
      st_get_shader_program_completion_status;
}