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 <[email protected]> 25 */ 26 27 #ifndef SHADERIMAGE_H 28 #define SHADERIMAGE_H 29 30 #include "util/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 pixel type GL enum from the shader image format GL enum. 47 */ 48 GLenum 49 _mesa_get_shader_image_pixel_type(GLenum image_format); 50 51 /** 52 * Get the GL image format class for a shader image format GL enum 53 */ 54 GLenum 55 _mesa_get_image_format_class(GLenum format); 56 57 /** 58 * Return whether an image format should be supported based on the current API 59 * version of the context. 60 */ 61 bool 62 _mesa_is_shader_image_format_supported(const struct gl_context *ctx, 63 GLenum format); 64 65 /** 66 * Get a single image unit struct with the default state. 67 */ 68 struct gl_image_unit 69 _mesa_default_image_unit(struct gl_context *ctx); 70 71 /** 72 * Initialize a context's shader image units to the default state. 73 */ 74 void 75 _mesa_init_image_units(struct gl_context *ctx); 76 77 void 78 _mesa_free_image_textures(struct gl_context *ctx); 79 80 /** 81 * Return GL_TRUE if the state of the image unit passed as argument is valid 82 * and access from the shader is allowed. Otherwise loads from this unit 83 * should return zero and stores should have no effect. 84 * 85 * The result depends on context state other than the passed image unit, part 86 * of the _NEW_TEXTURE_OBJECT set. 87 */ 88 GLboolean 89 _mesa_is_image_unit_valid(struct gl_context *ctx, struct gl_image_unit *u); 90 91 #ifdef __cplusplus 92 } 93 #endif 94 95 #endif 96