1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (C) 2009 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, 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#ifndef SHADER_ENUMS_H
#define SHADER_ENUMS_H
/**
* Shader stages. Note that these will become 5 with tessellation.
*
* The order must match how shaders are ordered in the pipeline.
* The GLSL linker assumes that if i<j, then the j-th shader is
* executed later than the i-th shader.
*/
typedef enum
{
MESA_SHADER_VERTEX = 0,
MESA_SHADER_TESS_CTRL = 1,
MESA_SHADER_TESS_EVAL = 2,
MESA_SHADER_GEOMETRY = 3,
MESA_SHADER_FRAGMENT = 4,
MESA_SHADER_COMPUTE = 5,
} gl_shader_stage;
#define MESA_SHADER_STAGES (MESA_SHADER_COMPUTE + 1)
/**
* Bitflags for system values.
*/
#define SYSTEM_BIT_SAMPLE_ID ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_ID)
#define SYSTEM_BIT_SAMPLE_POS ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_POS)
#define SYSTEM_BIT_SAMPLE_MASK_IN ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_MASK_IN)
/**
* If the gl_register_file is PROGRAM_SYSTEM_VALUE, the register index will be
* one of these values. If a NIR variable's mode is nir_var_system_value, it
* will be one of these values.
*/
typedef enum
{
/**
* \name Vertex shader system values
*/
/*@{*/
/**
* OpenGL-style vertex ID.
*
* Section 2.11.7 (Shader Execution), subsection Shader Inputs, of the
* OpenGL 3.3 core profile spec says:
*
* "gl_VertexID holds the integer index i implicitly passed by
* DrawArrays or one of the other drawing commands defined in section
* 2.8.3."
*
* Section 2.8.3 (Drawing Commands) of the same spec says:
*
* "The commands....are equivalent to the commands with the same base
* name (without the BaseVertex suffix), except that the ith element
* transferred by the corresponding draw call will be taken from
* element indices[i] + basevertex of each enabled array."
*
* Additionally, the overview in the GL_ARB_shader_draw_parameters spec
* says:
*
* "In unextended GL, vertex shaders have inputs named gl_VertexID and
* gl_InstanceID, which contain, respectively the index of the vertex
* and instance. The value of gl_VertexID is the implicitly passed
* index of the vertex being processed, which includes the value of
* baseVertex, for those commands that accept it."
*
* gl_VertexID gets basevertex added in. This differs from DirectX where
* SV_VertexID does \b not get basevertex added in.
*
* \note
* If all system values are available, \c SYSTEM_VALUE_VERTEX_ID will be
* equal to \c SYSTEM_VALUE_VERTEX_ID_ZERO_BASE plus
* \c SYSTEM_VALUE_BASE_VERTEX.
*
* \sa SYSTEM_VALUE_VERTEX_ID_ZERO_BASE, SYSTEM_VALUE_BASE_VERTEX
*/
SYSTEM_VALUE_VERTEX_ID,
/**
* Instanced ID as supplied to gl_InstanceID
*
* Values assigned to gl_InstanceID always begin with zero, regardless of
* the value of baseinstance.
*
* Section 11.1.3.9 (Shader Inputs) of the OpenGL 4.4 core profile spec
* says:
*
* "gl_InstanceID holds the integer instance number of the current
* primitive in an instanced draw call (see section 10.5)."
*
* Through a big chain of pseudocode, section 10.5 describes that
* baseinstance is not counted by gl_InstanceID. In that section, notice
*
* "If an enabled vertex attribute array is instanced (it has a
* non-zero divisor as specified by VertexAttribDivisor), the element
* index that is transferred to the GL, for all vertices, is given by
*
* floor(instance/divisor) + baseinstance
*
* If an array corresponding to an attribute required by a vertex
* shader is not enabled, then the corresponding element is taken from
* the current attribute state (see section 10.2)."
*
* Note that baseinstance is \b not included in the value of instance.
*/
SYSTEM_VALUE_INSTANCE_ID,
/**
* DirectX-style vertex ID.
*
* Unlike \c SYSTEM_VALUE_VERTEX_ID, this system value does \b not include
* the value of basevertex.
*
* \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_BASE_VERTEX
*/
SYSTEM_VALUE_VERTEX_ID_ZERO_BASE,
/**
* Value of \c basevertex passed to \c glDrawElementsBaseVertex and similar
* functions.
*
* \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_VERTEX_ID_ZERO_BASE
*/
SYSTEM_VALUE_BASE_VERTEX,
/*@}*/
/**
* \name Geometry shader system values
*/
/*@{*/
SYSTEM_VALUE_INVOCATION_ID, /**< (Also in Tessellation Control shader) */
/*@}*/
/**
* \name Fragment shader system values
*/
/*@{*/
SYSTEM_VALUE_FRONT_FACE, /**< (not done yet) */
SYSTEM_VALUE_SAMPLE_ID,
SYSTEM_VALUE_SAMPLE_POS,
SYSTEM_VALUE_SAMPLE_MASK_IN,
/*@}*/
/**
* \name Tessellation Evaluation shader system values
*/
/*@{*/
SYSTEM_VALUE_TESS_COORD,
SYSTEM_VALUE_VERTICES_IN, /**< Tessellation vertices in input patch */
SYSTEM_VALUE_PRIMITIVE_ID, /**< (currently not used by GS) */
SYSTEM_VALUE_TESS_LEVEL_OUTER, /**< TES input */
SYSTEM_VALUE_TESS_LEVEL_INNER, /**< TES input */
/*@}*/
SYSTEM_VALUE_MAX /**< Number of values */
} gl_system_value;
/**
* The possible interpolation qualifiers that can be applied to a fragment
* shader input in GLSL.
*
* Note: INTERP_QUALIFIER_NONE must be 0 so that memsetting the
* gl_fragment_program data structure to 0 causes the default behavior.
*/
enum glsl_interp_qualifier
{
INTERP_QUALIFIER_NONE = 0,
INTERP_QUALIFIER_SMOOTH,
INTERP_QUALIFIER_FLAT,
INTERP_QUALIFIER_NOPERSPECTIVE,
INTERP_QUALIFIER_COUNT /**< Number of interpolation qualifiers */
};
#endif /* SHADER_ENUMS_H */
|
