在 OpenGL 中有一种方法可以获取所有制服的列表 &着色器程序使用的属性? [英] In OpenGL is there a way to get a list of all uniforms & attribs used by a shader program?

问题描述

我想要一份所有制服的清单 &着色器程序对象使用的属性.glGetAttribLocation() &glGetUniformLocation() 可用于将字符串映射到位置，但我真正想要的是字符串列表，而无需解析 glsl 代码.

I'd like to get a list of all the uniforms & attribs used by a shader program object. glGetAttribLocation() & glGetUniformLocation() can be used to map a string to a location, but what I would really like is the list of strings without having to parse the glsl code.

注意:在 OpenGL 2.0 中 glGetObjectParameteriv() 被替换为 glGetProgramiv().枚举是 GL_ACTIVE_UNIFORMS &GL_ACTIVE_ATTRIBUTES.

Note: In OpenGL 2.0 glGetObjectParameteriv() is replaced by glGetProgramiv(). And the enum is GL_ACTIVE_UNIFORMS & GL_ACTIVE_ATTRIBUTES.

推荐答案

两个示例之间共享的变量:

GLint i;
GLint count;

GLint size; // size of the variable
GLenum type; // type of the variable (float, vec3 or mat4, etc)

const GLsizei bufSize = 16; // maximum name length
GLchar name[bufSize]; // variable name in GLSL
GLsizei length; // name length

属性

glGetProgramiv(program, GL_ACTIVE_ATTRIBUTES, &count);
printf("Active Attributes: %d
", count);

for (i = 0; i < count; i++)
{
    glGetActiveAttrib(program, (GLuint)i, bufSize, &length, &size, &type, name);

    printf("Attribute #%d Type: %u Name: %s
", i, type, name);
}

制服

glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &count);
printf("Active Uniforms: %d
", count);

for (i = 0; i < count; i++)
{
    glGetActiveUniform(program, (GLuint)i, bufSize, &length, &size, &type, name);

    printf("Uniform #%d Type: %u Name: %s
", i, type, name);
}

OpenGL 文档/变量类型

代表变量类型的各种宏可以在文档.如GL_FLOAT、GL_FLOAT_VEC3、GL_FLOAT_MAT4等

• glGetActiveAttrib
• glGetActiveUniform

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