src/glsl/ir_uniform.h

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #pragma once
  25 #ifndef IR_UNIFORM_H
  26 #define IR_UNIFORM_H
  27
  28
  29 /* stdbool.h is necessary because this file is included in both C and C++ code.
  30  */
  31 #include <stdbool.h>
  32
  33 #include "program/prog_parameter.h"  /* For union gl_constant_value. */
  34
  35 /**
  36  * Used by GL_ARB_explicit_uniform_location extension code in the linker
  37  * and glUniform* functions to identify inactive explicit uniform locations.
  38  */
  39 #define INACTIVE_UNIFORM_EXPLICIT_LOCATION ((gl_uniform_storage *) -1)
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 enum PACKED gl_uniform_driver_format {
  46    uniform_native = 0,          /**< Store data in the native format. */
  47    uniform_int_float,           /**< Store integer data as floats. */
  48 };
  49
  50 struct gl_uniform_driver_storage {
  51    /**
  52     * Number of bytes from one array element to the next.
  53     */
  54    uint8_t element_stride;
  55
  56    /**
  57     * Number of bytes from one vector in a matrix to the next.
  58     */
  59    uint8_t vector_stride;
  60
  61    /**
  62     * Base format of the stored data.
  63     */
  64    enum gl_uniform_driver_format format;
  65
  66    /**
  67     * Pointer to the base of the data.
  68     */
  69    void *data;
  70 };
  71
  72 struct gl_opaque_uniform_index {
  73    /**
  74     * Base opaque uniform index
  75     *
  76     * If \c gl_uniform_storage::base_type is an opaque type, this
  77     * represents its uniform index.  If \c
  78     * gl_uniform_storage::array_elements is not zero, the array will
  79     * use opaque uniform indices \c index through \c index + \c
  80     * gl_uniform_storage::array_elements - 1, inclusive.
  81     *
  82     * Note that the index may be different in each shader stage.
  83     */
  84    uint8_t index;
  85
  86    /**
  87     * Whether this opaque uniform is used in this shader stage.
  88     */
  89    bool active;
  90 };
  91
  92 struct gl_uniform_storage {
  93    char *name;
  94    /** Type of this uniform data stored.
  95     *
  96     * In the case of an array, it's the type of a single array element.
  97     */
  98    const struct glsl_type *type;
  99
 100    /**
 101     * The number of elements in this uniform.
 102     *
 103     * For non-arrays, this is always 0.  For arrays, the value is the size of
 104     * the array.
 105     */
 106    unsigned array_elements;
 107
 108    /**
 109     * Has this uniform ever been set?
 110     */
 111    bool initialized;
 112
 113    struct gl_opaque_uniform_index sampler[MESA_SHADER_STAGES];
 114
 115    struct gl_opaque_uniform_index image[MESA_SHADER_STAGES];
 116
 117    /**
 118     * Storage used by the driver for the uniform
 119     */
 120    unsigned num_driver_storage;
 121    struct gl_uniform_driver_storage *driver_storage;
 122
 123    /**
 124     * Storage used by Mesa for the uniform
 125     *
 126     * This form of the uniform is used by Mesa's implementation of \c
 127     * glGetUniform.  It can also be used by drivers to obtain the value of the
 128     * uniform if the \c ::driver_storage interface is not used.
 129     */
 130    union gl_constant_value *storage;
 131
 132    /** Fields for GL_ARB_uniform_buffer_object
 133     * @{
 134     */
 135
 136    /**
 137     * GL_UNIFORM_BLOCK_INDEX: index of the uniform block containing
 138     * the uniform, or -1 for the default uniform block.  Note that the
 139     * index is into the linked program's UniformBlocks[] array, not
 140     * the linked shader's.
 141     */
 142    int block_index;
 143
 144    /** GL_UNIFORM_OFFSET: byte offset within the uniform block, or -1. */
 145    int offset;
 146
 147    /**
 148     * GL_UNIFORM_MATRIX_STRIDE: byte stride between columns or rows of
 149     * a matrix.  Set to 0 for non-matrices in UBOs, or -1 for uniforms
 150     * in the default uniform block.
 151     */
 152    int matrix_stride;
 153
 154    /**
 155     * GL_UNIFORM_ARRAY_STRIDE: byte stride between elements of the
 156     * array.  Set to zero for non-arrays in UBOs, or -1 for uniforms
 157     * in the default uniform block.
 158     */
 159    int array_stride;
 160
 161    /** GL_UNIFORM_ROW_MAJOR: true iff it's a row-major matrix in a UBO */
 162    bool row_major;
 163
 164    /** @} */
 165
 166    /**
 167     * Index within gl_shader_program::AtomicBuffers[] of the atomic
 168     * counter buffer this uniform is stored in, or -1 if this is not
 169     * an atomic counter.
 170     */
 171    int atomic_buffer_index;
 172
 173    /**
 174     * The 'base location' for this uniform in the uniform remap table. For
 175     * arrays this is the first element in the array.
 176     */
 177    unsigned remap_location;
 178
 179    /**
 180     * This is a compiler-generated uniform that should not be advertised
 181     * via the API.
 182     */
 183    bool hidden;
 184 };
 185
 186 #ifdef __cplusplus
 187 }
 188 #endif
 189
 190 #endif /* IR_UNIFORM_H */