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      1 /*
      2  * Mesa 3-D graphics library
      3  * Version:  7.1
      4  *
      5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a
      8  * copy of this software and associated documentation files (the "Software"),
      9  * to deal in the Software without restriction, including without limitation
     10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     11  * and/or sell copies of the Software, and to permit persons to whom the
     12  * Software is furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included
     15  * in all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
     21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 
     25 #define DEBUG_PARSING 0
     26 
     27 /**
     28  * \file arbprogparse.c
     29  * ARB_*_program parser core
     30  * \author Karl Rasche
     31  */
     32 
     33 /**
     34 Notes on program parameters, etc.
     35 
     36 The instructions we emit will use six kinds of source registers:
     37 
     38   PROGRAM_INPUT      - input registers
     39   PROGRAM_TEMPORARY  - temp registers
     40   PROGRAM_ADDRESS    - address/indirect register
     41   PROGRAM_SAMPLER    - texture sampler
     42   PROGRAM_CONSTANT   - indexes into program->Parameters, a known constant/literal
     43   PROGRAM_STATE_VAR  - indexes into program->Parameters, and may actually be:
     44                        + a state variable, like "state.fog.color", or
     45                        + a pointer to a "program.local[k]" parameter, or
     46                        + a pointer to a "program.env[k]" parameter
     47 
     48 Basically, all the program.local[] and program.env[] values will get mapped
     49 into the unified gl_program->Parameters array.  This solves the problem of
     50 having three separate program parameter arrays.
     51 */
     52 
     53 
     54 #include "main/glheader.h"
     55 #include "main/imports.h"
     56 #include "main/context.h"
     57 #include "main/mtypes.h"
     58 #include "arbprogparse.h"
     59 #include "programopt.h"
     60 #include "prog_parameter.h"
     61 #include "prog_statevars.h"
     62 #include "prog_instruction.h"
     63 #include "program_parser.h"
     64 
     65 
     66 void
     67 _mesa_parse_arb_fragment_program(struct gl_context* ctx, GLenum target,
     68                                  const GLvoid *str, GLsizei len,
     69                                  struct gl_fragment_program *program)
     70 {
     71    struct gl_program prog;
     72    struct asm_parser_state state;
     73    GLuint i;
     74 
     75    ASSERT(target == GL_FRAGMENT_PROGRAM_ARB);
     76 
     77    memset(&prog, 0, sizeof(prog));
     78    memset(&state, 0, sizeof(state));
     79    state.prog = &prog;
     80 
     81    if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len,
     82 				&state)) {
     83       /* Error in the program. Just return. */
     84       return;
     85    }
     86 
     87    if (program->Base.String != NULL)
     88       free(program->Base.String);
     89 
     90    /* Copy the relevant contents of the arb_program struct into the
     91     * fragment_program struct.
     92     */
     93    program->Base.String          = prog.String;
     94    program->Base.NumInstructions = prog.NumInstructions;
     95    program->Base.NumTemporaries  = prog.NumTemporaries;
     96    program->Base.NumParameters   = prog.NumParameters;
     97    program->Base.NumAttributes   = prog.NumAttributes;
     98    program->Base.NumAddressRegs  = prog.NumAddressRegs;
     99    program->Base.NumNativeInstructions = prog.NumNativeInstructions;
    100    program->Base.NumNativeTemporaries = prog.NumNativeTemporaries;
    101    program->Base.NumNativeParameters = prog.NumNativeParameters;
    102    program->Base.NumNativeAttributes = prog.NumNativeAttributes;
    103    program->Base.NumNativeAddressRegs = prog.NumNativeAddressRegs;
    104    program->Base.NumAluInstructions   = prog.NumAluInstructions;
    105    program->Base.NumTexInstructions   = prog.NumTexInstructions;
    106    program->Base.NumTexIndirections   = prog.NumTexIndirections;
    107    program->Base.NumNativeAluInstructions = prog.NumAluInstructions;
    108    program->Base.NumNativeTexInstructions = prog.NumTexInstructions;
    109    program->Base.NumNativeTexIndirections = prog.NumTexIndirections;
    110    program->Base.InputsRead      = prog.InputsRead;
    111    program->Base.OutputsWritten  = prog.OutputsWritten;
    112    program->Base.IndirectRegisterFiles = prog.IndirectRegisterFiles;
    113    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++) {
    114       program->Base.TexturesUsed[i] = prog.TexturesUsed[i];
    115       if (prog.TexturesUsed[i])
    116          program->Base.SamplersUsed |= (1 << i);
    117    }
    118    program->Base.ShadowSamplers = prog.ShadowSamplers;
    119    program->OriginUpperLeft = state.option.OriginUpperLeft;
    120    program->PixelCenterInteger = state.option.PixelCenterInteger;
    121 
    122    program->UsesKill            = state.fragment.UsesKill;
    123    program->UsesDFdy            = state.fragment.UsesDFdy;
    124 
    125    if (program->Base.Instructions)
    126       free(program->Base.Instructions);
    127    program->Base.Instructions = prog.Instructions;
    128 
    129    if (program->Base.Parameters)
    130       _mesa_free_parameter_list(program->Base.Parameters);
    131    program->Base.Parameters    = prog.Parameters;
    132 
    133    /* Append fog instructions now if the program has "OPTION ARB_fog_exp"
    134     * or similar.  We used to leave this up to drivers, but it appears
    135     * there's no hardware that wants to do fog in a discrete stage separate
    136     * from the fragment shader.
    137     */
    138    if (state.option.Fog != OPTION_NONE) {
    139       static const GLenum fog_modes[4] = {
    140 	 GL_NONE, GL_EXP, GL_EXP2, GL_LINEAR
    141       };
    142 
    143       /* XXX: we should somehow recompile this to remove clamping if disabled
    144        * On the ATI driver, this is unclampled if fragment clamping is disabled
    145        */
    146       _mesa_append_fog_code(ctx, program, fog_modes[state.option.Fog], GL_TRUE);
    147    }
    148 
    149 #if DEBUG_FP
    150    printf("____________Fragment program %u ________\n", program->Base.Id);
    151    _mesa_print_program(&program->Base);
    152 #endif
    153 }
    154 
    155 
    156 
    157 /**
    158  * Parse the vertex program string.  If success, update the given
    159  * vertex_program object with the new program.  Else, leave the vertex_program
    160  * object unchanged.
    161  */
    162 void
    163 _mesa_parse_arb_vertex_program(struct gl_context *ctx, GLenum target,
    164 			       const GLvoid *str, GLsizei len,
    165 			       struct gl_vertex_program *program)
    166 {
    167    struct gl_program prog;
    168    struct asm_parser_state state;
    169 
    170    ASSERT(target == GL_VERTEX_PROGRAM_ARB);
    171 
    172    memset(&prog, 0, sizeof(prog));
    173    memset(&state, 0, sizeof(state));
    174    state.prog = &prog;
    175 
    176    if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len,
    177 				&state)) {
    178       _mesa_error(ctx, GL_INVALID_OPERATION, "glProgramString(bad program)");
    179       return;
    180    }
    181 
    182    if (program->Base.String != NULL)
    183       free(program->Base.String);
    184 
    185    /* Copy the relevant contents of the arb_program struct into the
    186     * vertex_program struct.
    187     */
    188    program->Base.String          = prog.String;
    189    program->Base.NumInstructions = prog.NumInstructions;
    190    program->Base.NumTemporaries  = prog.NumTemporaries;
    191    program->Base.NumParameters   = prog.NumParameters;
    192    program->Base.NumAttributes   = prog.NumAttributes;
    193    program->Base.NumAddressRegs  = prog.NumAddressRegs;
    194    program->Base.NumNativeInstructions = prog.NumNativeInstructions;
    195    program->Base.NumNativeTemporaries = prog.NumNativeTemporaries;
    196    program->Base.NumNativeParameters = prog.NumNativeParameters;
    197    program->Base.NumNativeAttributes = prog.NumNativeAttributes;
    198    program->Base.NumNativeAddressRegs = prog.NumNativeAddressRegs;
    199    program->Base.InputsRead     = prog.InputsRead;
    200    program->Base.OutputsWritten = prog.OutputsWritten;
    201    program->Base.IndirectRegisterFiles = prog.IndirectRegisterFiles;
    202    program->IsPositionInvariant = (state.option.PositionInvariant)
    203       ? GL_TRUE : GL_FALSE;
    204 
    205    if (program->Base.Instructions)
    206       free(program->Base.Instructions);
    207    program->Base.Instructions = prog.Instructions;
    208 
    209    if (program->Base.Parameters)
    210       _mesa_free_parameter_list(program->Base.Parameters);
    211    program->Base.Parameters = prog.Parameters;
    212 
    213 #if DEBUG_VP
    214    printf("____________Vertex program %u __________\n", program->Base.Id);
    215    _mesa_print_program(&program->Base);
    216 #endif
    217 }
    218