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1 /*
2  * Mesa 3-D graphics library
3  *
4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included
14  * in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 #ifndef PROG_EXECUTE_H
26 #define PROG_EXECUTE_H
27 
28 #include "main/config.h"
29 #include "main/mtypes.h"
30 
31 
32 typedef void (*FetchTexelLodFunc)(struct gl_context *ctx, const GLfloat texcoord[4],
33                                   GLfloat lambda, GLuint unit, GLfloat color[4]);
34 
35 typedef void (*FetchTexelDerivFunc)(struct gl_context *ctx, const GLfloat texcoord[4],
36                                     const GLfloat texdx[4],
37                                     const GLfloat texdy[4],
38                                     GLfloat lodBias,
39                                     GLuint unit, GLfloat color[4]);
40 
41 
42 /** NOTE: This must match SWRAST_MAX_WIDTH */
43 #define PROG_MAX_WIDTH 16384
44 
45 
46 /**
47  * Virtual machine state used during execution of vertex/fragment programs.
48  */
49 struct gl_program_machine
50 {
51    const struct gl_program *CurProgram;
52 
53    /** Fragment Input attributes */
54    GLfloat (*Attribs)[PROG_MAX_WIDTH][4];
55    GLfloat (*DerivX)[4];
56    GLfloat (*DerivY)[4];
57    GLuint NumDeriv; /**< Max index into DerivX/Y arrays */
58    GLuint CurElement; /**< Index into Attribs arrays */
59 
60    /** Vertex Input attribs */
61    GLfloat VertAttribs[VERT_ATTRIB_MAX][4];
62 
63    GLfloat Temporaries[MAX_PROGRAM_TEMPS][4];
64    GLfloat Outputs[MAX_PROGRAM_OUTPUTS][4];
65    GLfloat (*EnvParams)[4]; /**< Vertex or Fragment env parameters */
66    GLint AddressReg[MAX_PROGRAM_ADDRESS_REGS][4];
67    GLfloat SystemValues[SYSTEM_VALUE_MAX][4];
68 
69    const GLubyte *Samplers;  /** Array mapping sampler var to tex unit */
70 
71    GLuint CallStack[MAX_PROGRAM_CALL_DEPTH]; /**< For CAL/RET instructions */
72    GLuint StackDepth; /**< Index/ptr to top of CallStack[] */
73 
74    /** Texture fetch functions */
75    FetchTexelLodFunc FetchTexelLod;
76    FetchTexelDerivFunc FetchTexelDeriv;
77 };
78 
79 
80 extern GLboolean
81 _mesa_execute_program(struct gl_context *ctx,
82                       const struct gl_program *program,
83                       struct gl_program_machine *machine);
84 
85 
86 #endif /* PROG_EXECUTE_H */
87