// Copyright (c) 2016-2020 NVIDIA Corporation
//
// SPDX-License-Identifier: CC-BY-4.0

include::{generated}/meta/{refprefix}VK_NV_glsl_shader.adoc[]

=== Other Extension Metadata

*Last Modified Date*::
    2016-02-14
*IP Status*::
    No known IP claims.
*Contributors*::
  - Piers Daniell, NVIDIA

=== Description

This extension allows GLSL shaders written to the `GL_KHR_vulkan_glsl`
extension specification to be used instead of SPIR-V.
The implementation will automatically detect whether the shader is SPIR-V or
GLSL, and compile it appropriately.

=== Deprecation

Functionality in this extension is outside of the scope of Vulkan and is
better served by a compiler library such as
https://github.com/KhronosGroup/glslang[glslang].
No new implementations will support this extension, so applications should:
not use it.

include::{generated}/interfaces/VK_NV_glsl_shader.adoc[]

=== Examples

*Example 1*

Passing in GLSL code

[source,c++]
----------------------------------------
    char const vss[] =
        "#version 450 core\n"
        "layout(location = 0) in vec2 aVertex;\n"
        "layout(location = 1) in vec4 aColor;\n"
        "out vec4 vColor;\n"
        "void main()\n"
        "{\n"
        "    vColor = aColor;\n"
        "    gl_Position = vec4(aVertex, 0, 1);\n"
        "}\n"
    ;
    VkShaderModuleCreateInfo vertexShaderInfo = { VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO };
    vertexShaderInfo.codeSize = sizeof vss;
    vertexShaderInfo.pCode = vss;
    VkShaderModule vertexShader;
    vkCreateShaderModule(device, &vertexShaderInfo, 0, &vertexShader);
----------------------------------------

=== Version History

  * Revision 1, 2016-02-14 (Piers Daniell)
  ** Initial draft
