src/mesa/main/shaderimage.h

   1 /*
   2  * Copyright 2013 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  * Authors:
  24  *    Francisco Jerez <currojerez@riseup.net>
  25  */
  26
  27 #ifndef SHADERIMAGE_H
  28 #define SHADERIMAGE_H
  29
  30 #include "glheader.h"
  31 #include "formats.h"
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 struct gl_context;
  38
  39 /**
  40  * Get the matching mesa_format for a shader image format GL enum.
  41  */
  42 mesa_format
  43 _mesa_get_shader_image_format(GLenum format);
  44
  45 /**
  46  * Get the GL image format class for a shader image format GL enum
  47  */
  48 GLenum
  49 _mesa_get_image_format_class(GLenum format);
  50
  51 /**
  52  * Return whether an image format should be supported based on the current API
  53  * version of the context.
  54  */
  55 bool
  56 _mesa_is_shader_image_format_supported(const struct gl_context *ctx,
  57                                        GLenum format);
  58
  59 /**
  60  * Get a single image unit struct with the default state.
  61  */
  62 struct gl_image_unit
  63 _mesa_default_image_unit(struct gl_context *ctx);
  64
  65 /**
  66  * Initialize a context's shader image units to the default state.
  67  */
  68 void
  69 _mesa_init_image_units(struct gl_context *ctx);
  70
  71 void
  72 _mesa_free_image_textures(struct gl_context *ctx);
  73
  74 /**
  75  * Return GL_TRUE if the state of the image unit passed as argument is valid
  76  * and access from the shader is allowed.  Otherwise loads from this unit
  77  * should return zero and stores should have no effect.
  78  *
  79  * The result depends on context state other than the passed image unit, part
  80  * of the _NEW_TEXTURE_OBJECT set.
  81  */
  82 GLboolean
  83 _mesa_is_image_unit_valid(struct gl_context *ctx, struct gl_image_unit *u);
  84
  85 void GLAPIENTRY
  86 _mesa_BindImageTexture_no_error(GLuint unit, GLuint texture, GLint level,
  87                                 GLboolean layered, GLint layer, GLenum access,
  88                                 GLenum format);
  89
  90 void GLAPIENTRY
  91 _mesa_BindImageTexture(GLuint unit, GLuint texture, GLint level,
  92                        GLboolean layered, GLint layer, GLenum access,
  93                        GLenum format);
  94
  95 void GLAPIENTRY
  96 _mesa_BindImageTextureEXT(GLuint unit, GLuint texture, GLint level,
  97                           GLboolean layered, GLint layer, GLenum access,
  98                           GLint format);
  99
 100 void GLAPIENTRY
 101 _mesa_BindImageTextures_no_error(GLuint first, GLsizei count,
 102                                  const GLuint *textures);
 103
 104 void GLAPIENTRY
 105 _mesa_BindImageTextures(GLuint first, GLsizei count, const GLuint *textures);
 106
 107 #ifdef __cplusplus
 108 }
 109 #endif
 110
 111 #endif