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  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. #ifdef __cplusplus
  37. extern "C" {
  38. #endif
  39.  
  40. enum gl_uniform_driver_format {
  41.    uniform_native = 0,          /**< Store data in the native format. */
  42.    uniform_int_float,           /**< Store integer data as floats. */
  43.    uniform_bool_float,          /**< Store boolean data as floats. */
  44.  
  45.    /**
  46.     * Store boolean data as integer using 1 for \c true.
  47.     */
  48.    uniform_bool_int_0_1,
  49.  
  50.    /**
  51.     * Store boolean data as integer using ~0 for \c true.
  52.     */
  53.    uniform_bool_int_0_not0
  54. };
  55.  
  56. struct gl_uniform_driver_storage {
  57.    /**
  58.     * Number of bytes from one array element to the next.
  59.     */
  60.    uint8_t element_stride;
  61.  
  62.    /**
  63.     * Number of bytes from one vector in a matrix to the next.
  64.     */
  65.    uint8_t vector_stride;
  66.  
  67.    /**
  68.     * Base format of the stored data.
  69.     *
  70.     * This field must have a value from \c GLSL_TYPE_UINT through \c
  71.     * GLSL_TYPE_SAMPLER.
  72.     */
  73.    uint8_t format;
  74.  
  75.    /**
  76.     * Pointer to the base of the data.
  77.     */
  78.    void *data;
  79. };
  80.  
  81. struct gl_uniform_storage {
  82.    char *name;
  83.    /** Type of this uniform data stored.
  84.     *
  85.     * In the case of an array, it's the type of a single array element.
  86.     */
  87.    const struct glsl_type *type;
  88.  
  89.    /**
  90.     * The number of elements in this uniform.
  91.     *
  92.     * For non-arrays, this is always 0.  For arrays, the value is the size of
  93.     * the array.
  94.     */
  95.    unsigned array_elements;
  96.  
  97.    /**
  98.     * Has this uniform ever been set?
  99.     */
  100.    bool initialized;
  101.  
  102.    struct {
  103.       /**
  104.        * Base sampler index
  105.        *
  106.        * If \c ::base_type is \c GLSL_TYPE_SAMPLER, this represents the index
  107.        * of this sampler.  If \c ::array_elements is not zero, the array will
  108.        * use sampler indices \c ::sampler through \c ::sampler +
  109.        * \c ::array_elements - 1, inclusive.
  110.        *
  111.        * Note that the index may be different in each shader stage.
  112.        */
  113.       uint8_t index;
  114.  
  115.       /**
  116.        * Whether this sampler is used in this shader stage.
  117.        */
  118.       bool active;
  119.    } sampler[MESA_SHADER_TYPES];
  120.  
  121.    /**
  122.     * Storage used by the driver for the uniform
  123.     */
  124.    unsigned num_driver_storage;
  125.    struct gl_uniform_driver_storage *driver_storage;
  126.  
  127.    /**
  128.     * Storage used by Mesa for the uniform
  129.     *
  130.     * This form of the uniform is used by Mesa's implementation of \c
  131.     * glGetUniform.  It can also be used by drivers to obtain the value of the
  132.     * uniform if the \c ::driver_storage interface is not used.
  133.     */
  134.    union gl_constant_value *storage;
  135.  
  136.    /** Fields for GL_ARB_uniform_buffer_object
  137.     * @{
  138.     */
  139.  
  140.    /**
  141.     * GL_UNIFORM_BLOCK_INDEX: index of the uniform block containing
  142.     * the uniform, or -1 for the default uniform block.  Note that the
  143.     * index is into the linked program's UniformBlocks[] array, not
  144.     * the linked shader's.
  145.     */
  146.    int block_index;
  147.  
  148.    /** GL_UNIFORM_OFFSET: byte offset within the uniform block, or -1. */
  149.    int offset;
  150.  
  151.    /**
  152.     * GL_UNIFORM_MATRIX_STRIDE: byte stride between columns or rows of
  153.     * a matrix.  Set to 0 for non-matrices in UBOs, or -1 for uniforms
  154.     * in the default uniform block.
  155.     */
  156.    int matrix_stride;
  157.  
  158.    /**
  159.     * GL_UNIFORM_ARRAY_STRIDE: byte stride between elements of the
  160.     * array.  Set to zero for non-arrays in UBOs, or -1 for uniforms
  161.     * in the default uniform block.
  162.     */
  163.    int array_stride;
  164.  
  165.    /** GL_UNIFORM_ROW_MAJOR: true iff it's a row-major matrix in a UBO */
  166.    bool row_major;
  167.  
  168.    /** @} */
  169. };
  170.  
  171. #ifdef __cplusplus
  172. }
  173. #endif
  174.  
  175. #endif /* IR_UNIFORM_H */
  176.