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1 /*
2  * Mesa 3-D graphics library
3  *
4  * Copyright (C) 1999-2008  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 /**
26  * \file prog_parameter.c
27  * Program parameter lists and functions.
28  * \author Brian Paul
29  */
30 
31 #ifndef PROG_PARAMETER_H
32 #define PROG_PARAMETER_H
33 
34 #include "main/mtypes.h"
35 #include "prog_statevars.h"
36 
37 #include <string.h>
38 
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
43 
44 /**
45  * Actual data for constant values of parameters.
46  */
47 typedef union gl_constant_value
48 {
49    GLfloat f;
50    GLint b;
51    GLint i;
52    GLuint u;
53 } gl_constant_value;
54 
55 
56 /**
57  * Program parameter.
58  * Used by shaders/programs for uniforms, constants, varying vars, etc.
59  */
60 struct gl_program_parameter
61 {
62    const char *Name;        /**< Null-terminated string */
63    gl_register_file Type;   /**< PROGRAM_CONSTANT or STATE_VAR */
64    GLenum DataType;         /**< GL_FLOAT, GL_FLOAT_VEC2, etc */
65    /**
66     * Number of components (1..4), or more.
67     * If the number of components is greater than 4,
68     * this parameter is part of a larger uniform like a GLSL matrix or array.
69     * The next program parameter's Size will be Size-4 of this parameter.
70     */
71    GLuint Size;
72    GLboolean Initialized;   /**< debug: Has the ParameterValue[] been set? */
73    /**
74     * A sequence of STATE_* tokens and integers to identify GL state.
75     */
76    gl_state_index StateIndexes[STATE_LENGTH];
77 };
78 
79 
80 /**
81  * List of gl_program_parameter instances.
82  */
83 struct gl_program_parameter_list
84 {
85    GLuint Size;           /**< allocated size of Parameters, ParameterValues */
86    GLuint NumParameters;  /**< number of parameters in arrays */
87    struct gl_program_parameter *Parameters; /**< Array [Size] */
88    gl_constant_value (*ParameterValues)[4]; /**< Array [Size] of constant[4] */
89    GLbitfield StateFlags; /**< _NEW_* flags indicating which state changes
90                                might invalidate ParameterValues[] */
91 };
92 
93 
94 extern struct gl_program_parameter_list *
95 _mesa_new_parameter_list(void);
96 
97 extern struct gl_program_parameter_list *
98 _mesa_new_parameter_list_sized(unsigned size);
99 
100 extern void
101 _mesa_free_parameter_list(struct gl_program_parameter_list *paramList);
102 
103 extern void
104 _mesa_reserve_parameter_storage(struct gl_program_parameter_list *paramList,
105                                 unsigned reserve_slots);
106 
107 extern GLint
108 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
109                     gl_register_file type, const char *name,
110                     GLuint size, GLenum datatype,
111                     const gl_constant_value *values,
112                     const gl_state_index state[STATE_LENGTH]);
113 
114 extern GLint
115 _mesa_add_typed_unnamed_constant(struct gl_program_parameter_list *paramList,
116                            const gl_constant_value values[4], GLuint size,
117                            GLenum datatype, GLuint *swizzleOut);
118 
119 static inline GLint
_mesa_add_unnamed_constant(struct gl_program_parameter_list * paramList,const gl_constant_value values[4],GLuint size,GLuint * swizzleOut)120 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
121                            const gl_constant_value values[4], GLuint size,
122                            GLuint *swizzleOut)
123 {
124    return _mesa_add_typed_unnamed_constant(paramList, values, size, GL_NONE,
125                                            swizzleOut);
126 }
127 
128 extern GLint
129 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
130                           const gl_state_index stateTokens[STATE_LENGTH]);
131 
132 
133 static inline GLint
_mesa_lookup_parameter_index(const struct gl_program_parameter_list * paramList,const char * name)134 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
135                              const char *name)
136 {
137    if (!paramList)
138       return -1;
139 
140    /* name must be null-terminated */
141    for (GLint i = 0; i < (GLint) paramList->NumParameters; i++) {
142       if (paramList->Parameters[i].Name &&
143          strcmp(paramList->Parameters[i].Name, name) == 0)
144          return i;
145    }
146 
147    return -1;
148 }
149 
150 #ifdef __cplusplus
151 }
152 #endif
153 
154 #endif /* PROG_PARAMETER_H */
155