OpenGL 4.5 完整参考手册：核心功能与兼容性指南

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"OpenGL4.5 Reference Pages.pdf" 是一份全面的OpenGL图形学参考资料，专为学习和理解OpenGL 4.5版本设计。这份文档详细地列出了所有命令和函数的使用指南，包括参数描述、返回值、错误处理、相关命令和函数，以及版本兼容性信息。它提供两种类型的索引供用户选择：传统的扁平索引，将API命令和GLSL函数合并在一起；以及折叠式索引，分别针对命令和函数进行分组，方便查找。核心功能部分专门关注OpenGL 4.5的核心特性，对于兼容性上下文的功能，文档建议查阅OpenGL 2.1 Reference Pages，或者参考感兴趣的特定扩展规范。在技术实现上，这些参考页面是用HTML5格式编写的，并嵌入了MathML支持数学公式，以确保更精确和清晰的表述。然而，由于其依赖现代浏览器的技术特性，如IE8及更早版本可能无法正常显示某些页面，推荐使用支持HTML5的现代浏览器，如IE9及以上版本来获取最佳阅读体验。在学习过程中，这份文档是深入掌握OpenGL编程的宝贵资源，无论是初学者还是高级开发者，都能从中找到所需的信息，进行高效和精确的编程实践。对于图形渲染、3D图形处理、GPU编程等方面的研究，它是不可或缺的参考资料。同时，了解文档中的错误条件和版本兼容性信息，有助于开发者在实际项目中避免潜在问题，确保程序的稳定性和跨平台性能。

target

is GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,

index

must be less than

the value of GL_MAX_VERTEX_STREAMS.

target

is GL_TIME_ELAPSED,

must be an unused name, or the name of an

existing timer query object previously bound to the GL_TIME_ELAPSED query

binding. When glBeginQueryIndexed is executed, the query object's time

counter is reset to 0. When glEndQueryIndexed is executed, the elapsed server

time that has passed since the call to glBeginQueryIndexed is written into the

query object's time counter. This value can be queried by calling glGetQueryObject

with

pname

GL_QUERY_RESULT. When

target

is GL_TIME_ELAPSED,

index

must be zero.

Querying the GL_QUERY_RESULT implicitly flushes the GL pipeline until the rendering

delimited by the query object has completed and the result is available.

GL_QUERY_RESULT_AVAILABLE can be queried to determine if the result is

immediately available or if the rendering is not yet complete.

Notes

If the query target's count exceeds the maximum value representable in the

number of available bits, as reported by glGetQueryiv with

target

set to the

appropriate query target and

pname

GL_QUERY_COUNTER_BITS, the count becomes

undefined.

An implementation may support 0 bits in its counter, in which case query results

are always undefined and essentially useless.

When GL_SAMPLE_BUFFERS is 0, the samples-passed counter of an occlusion query

will increment once for each fragment that passes the depth test. When

GL_SAMPLE_BUFFERS is 1, an implementation may either increment the samples-

passed counter individually for each sample of a fragment that passes the depth

test, or it may choose to increment the counter for all samples of a fragment if any

one of them passes the depth test.

Calling glBeginQuery or glEndQuery is equivalent to calling glBeginQueryIndexed

or glEndQueryIndexed with

index

set to zero, respectively.

Errors

GL_INVALID_ENUM is generated if

target

is not one of the accepted tokens.

GL_INVALID_VALUE is generated if

index

is greater than the query target-specific

maximum.

GL_INVALID_OPERATION is generated if glBeginQueryIndexed is executed while a

query object of the same

target

is already active.

GL_INVALID_OPERATION is generated if glEndQueryIndexed is executed when a

query object of the same

target

is not active.

GL_INVALID_OPERATION is generated if

is 0.

GL_INVALID_OPERATION is generated if

is the name of an already active query

object.

GL_INVALID_OPERATION is generated if

refers to an existing query object whose

type does not does not match

target

Version Support

Name

glBindAttribLocation — Associates a generic vertex attribute index with a named

attribute variable

C Specification

void glBindAttribLocation( GLuint program,

GLuint index,

const GLchar *name);

Parameters

program

Specifies the handle of the program object in which the association is to be

made.

index

Specifies the index of the generic vertex attribute to be bound.

name

Specifies a null terminated string containing the name of the vertex shader

attribute variable to which

index

is to be bound.

Description

glBindAttribLocation is used to associate a user-defined attribute variable in the

program object specified by

program

with a generic vertex attribute index. The name

of the user-defined attribute variable is passed as a null terminated string in

name

The generic vertex attribute index to be bound to this variable is specified by

index

When

program

is made part of current state, values provided via the generic vertex

attribute

index

will modify the value of the user-defined attribute variable specified

name

refers to a matrix attribute variable,

index

refers to the first column of the

matrix. Other matrix columns are then automatically bound to locations

index+1

for

a matrix of type mat2;

index+1

and

index+2

for a matrix of type mat3; and

index+1

index+2

, and

index+3

for a matrix of type mat4.

This command makes it possible for vertex shaders to use descriptive names for

attribute variables rather than generic variables that are numbered from zero to

the value of GL_MAX_VERTEX_ATTRIBS minus one. The values sent to each generic

attribute index are part of current state. If a different program object is made

current by calling glUseProgram, the generic vertex attributes are tracked in such a

way that the same values will be observed by attributes in the new program object

that are also bound to

index

Attribute variable name-to-generic attribute index bindings for a program object

can be explicitly assigned at any time by calling glBindAttribLocation. Attribute

bindings do not go into effect until glLinkProgram is called. After a program object

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