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/*

 * Mesa 3-D graphics library

 * Version:  7.1

 *

 * Copyright (C) 1999-2008  Brian Paul   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, 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

 * BRIAN PAUL 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.

 */

#define DEBUG_PARSING 0

/**

 * \file arbprogparse.c

 * ARB_*_program parser core

 * \author Karl Rasche

 */

/**

Notes on program parameters, etc.

The instructions we emit will use six kinds of source registers:

  PROGRAM_INPUT      - input registers

  PROGRAM_TEMPORARY  - temp registers

  PROGRAM_ADDRESS    - address/indirect register

  PROGRAM_SAMPLER    - texture sampler

  PROGRAM_CONSTANT   - indexes into program->Parameters, a known constant/literal

  PROGRAM_STATE_VAR  - indexes into program->Parameters, and may actually be:

                       + a state variable, like "state.fog.color", or

                       + a pointer to a "program.local[k]" parameter, or

                       + a pointer to a "program.env[k]" parameter

Basically, all the program.local[] and program.env[] values will get mapped

into the unified gl_program->Parameters array.  This solves the problem of

having three separate program parameter arrays.

*/

#include "main/glheader.h"

#include "main/imports.h"

#include "main/context.h"

#include "main/mtypes.h"

#include "arbprogparse.h"

#include "programopt.h"

#include "prog_parameter.h"

#include "prog_statevars.h"

#include "prog_instruction.h"

#include "program_parser.h"

void

_mesa_parse_arb_fragment_program(struct gl_context* ctx, GLenum target,

                                 const GLvoid *str, GLsizei len,

                                 struct gl_fragment_program *program)

{

   struct gl_program prog;

   struct asm_parser_state state;

   GLuint i;

   ASSERT(target == GL_FRAGMENT_PROGRAM_ARB);

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

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

   state.prog = &prog;

   if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len,

				&state)) {

      /* Error in the program. Just return. */

      return;

   }

   if (program->Base.String != NULL)

      free(program->Base.String);

   /* Copy the relevant contents of the arb_program struct into the

    * fragment_program struct.

    */

   program->Base.String          = prog.String;

   program->Base.NumInstructions = prog.NumInstructions;

   program->Base.NumTemporaries  = prog.NumTemporaries;

   program->Base.NumParameters   = prog.NumParameters;

   program->Base.NumAttributes   = prog.NumAttributes;

   program->Base.NumAddressRegs  = prog.NumAddressRegs;

   program->Base.NumNativeInstructions = prog.NumNativeInstructions;

   program->Base.NumNativeTemporaries = prog.NumNativeTemporaries;

   program->Base.NumNativeParameters = prog.NumNativeParameters;

   program->Base.NumNativeAttributes = prog.NumNativeAttributes;

   program->Base.NumNativeAddressRegs = prog.NumNativeAddressRegs;

   program->Base.NumAluInstructions   = prog.NumAluInstructions;

   program->Base.NumTexInstructions   = prog.NumTexInstructions;

   program->Base.NumTexIndirections   = prog.NumTexIndirections;

   program->Base.NumNativeAluInstructions = prog.NumAluInstructions;

   program->Base.NumNativeTexInstructions = prog.NumTexInstructions;

   program->Base.NumNativeTexIndirections = prog.NumTexIndirections;

   program->Base.InputsRead      = prog.InputsRead;

   program->Base.OutputsWritten  = prog.OutputsWritten;

   program->Base.IndirectRegisterFiles = prog.IndirectRegisterFiles;

   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++) {

      program->Base.TexturesUsed[i] = prog.TexturesUsed[i];

      if (prog.TexturesUsed[i])

         program->Base.SamplersUsed |= (1 << i);

   }

   program->Base.ShadowSamplers = prog.ShadowSamplers;

   switch (state.option.Fog) {

   case OPTION_FOG_EXP:    program->FogOption = GL_EXP;    break;

   case OPTION_FOG_EXP2:   program->FogOption = GL_EXP2;   break;

   case OPTION_FOG_LINEAR: program->FogOption = GL_LINEAR; break;

   default:                program->FogOption = GL_NONE;   break;

   }

   program->OriginUpperLeft = state.option.OriginUpperLeft;

   program->PixelCenterInteger = state.option.PixelCenterInteger;

   program->UsesKill            = state.fragment.UsesKill;

   if (program->FogOption)

      program->Base.InputsRead |= FRAG_BIT_FOGC;

   if (program->Base.Instructions)

      free(program->Base.Instructions);

   program->Base.Instructions = prog.Instructions;

   if (program->Base.Parameters)

      _mesa_free_parameter_list(program->Base.Parameters);

   program->Base.Parameters    = prog.Parameters;

   /* Append fog instructions now if the program has "OPTION ARB_fog_exp"

    * or similar.  We used to leave this up to drivers, but it appears

    * there's no hardware that wants to do fog in a discrete stage separate

    * from the fragment shader.

    */

   if (program->FogOption != GL_NONE) {

      _mesa_append_fog_code(ctx, program);

      program->FogOption = GL_NONE;

   }

#if DEBUG_FP

   printf("____________Fragment program %u ________\n", program->Base.Id);

   _mesa_print_program(&program->Base);

#endif

}

/**

 * Parse the vertex program string.  If success, update the given

 * vertex_program object with the new program.  Else, leave the vertex_program

 * object unchanged.

 */

void

_mesa_parse_arb_vertex_program(struct gl_context *ctx, GLenum target,

			       const GLvoid *str, GLsizei len,

			       struct gl_vertex_program *program)

{

   struct gl_program prog;

   struct asm_parser_state state;

   ASSERT(target == GL_VERTEX_PROGRAM_ARB);

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

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

   state.prog = &prog;

   if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len,

				&state)) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glProgramString(bad program)");

      return;

   }

   if (program->Base.String != NULL)

      free(program->Base.String);

   /* Copy the relevant contents of the arb_program struct into the

    * vertex_program struct.

    */

   program->Base.String          = prog.String;

   program->Base.NumInstructions = prog.NumInstructions;

   program->Base.NumTemporaries  = prog.NumTemporaries;

   program->Base.NumParameters   = prog.NumParameters;

   program->Base.NumAttributes   = prog.NumAttributes;

   program->Base.NumAddressRegs  = prog.NumAddressRegs;

   program->Base.NumNativeInstructions = prog.NumNativeInstructions;

   program->Base.NumNativeTemporaries = prog.NumNativeTemporaries;

   program->Base.NumNativeParameters = prog.NumNativeParameters;

   program->Base.NumNativeAttributes = prog.NumNativeAttributes;

   program->Base.NumNativeAddressRegs = prog.NumNativeAddressRegs;

   program->Base.InputsRead     = prog.InputsRead;

   program->Base.OutputsWritten = prog.OutputsWritten;

   program->Base.IndirectRegisterFiles = prog.IndirectRegisterFiles;

   program->IsPositionInvariant = (state.option.PositionInvariant)

      ? GL_TRUE : GL_FALSE;

   if (program->Base.Instructions)

      free(program->Base.Instructions);

   program->Base.Instructions = prog.Instructions;

   if (program->Base.Parameters)

      _mesa_free_parameter_list(program->Base.Parameters);

   program->Base.Parameters = prog.Parameters;

#if DEBUG_VP

   printf("____________Vertex program %u __________\n", program->Base.Id);

   _mesa_print_program(&program->Base);

#endif

}