ARB_program_interface_query

Overview

Numbers ARB Extension #134

Requires OpenGL 2.0

Affected By

• ARB_transform_feedback
• EXT_transform_feedback
• ARB_uniform_buffer_object
• ARB_shader_subroutine
• ARB_shader_atomic_counters
• ARB_shader_storage_buffer_object
• ARB_arrays_of_arrays
• ARB_compute_shader
• ARB_explicit_uniform_location

Since OpenGL 4.3 Core Profile Specification

这个扩展给应用程序提供一组统一的查询命令。这组命令用来查询被program objects用来与应用程序代码或其它program object通信的各种interfaces和resources的属性。

这个扩展定义了两个概念：interfaces和active resources

Interfaces

Provides a way for the program to communicate with application code, fixed-function OpenGL pipeline stages, and other programs.

例如：

• inputs
• outputs
• uniforms
• uniform blocks
• subroutines and subroutine uniforms
• atomic counter buffers

Active Resources

Each interface of a program has a set of active resources used by the program.

graph TD
    A[Data]
    B[Vertex Shader]
    C[Tess Control Shader]
    D[Tess Eval Shader]
    E[Geometry Shader]
    F[Fragment Shader]
    G[Output]

    A --> B
    B --> C
    C --> D
    D --> E
    E --> F
    F --> G