Graphics Reference
In-Depth Information
The current value of any hint can be retrieved by calling
glGetIntegerv
using the appropriate hint enumerated value.
OpenGL ES 3.0 references numerous entities that you define—textures,
shaders, programs, vertex buffers, sampler objects, query objects, sync
objects, vertex array objects, transform feedback objects, framebuffers, and
renderbuffers—by integer names. You can determine if a name is currently
in use (and therefore a valid entity) by calling one of the following
functions:
GLboolean
glIsTexture
(GLuint
texture
)
GLboolean
glIsShader
(GLuint
shader
)
GLboolean
glIsProgram
(GLuint
program
)
GLboolean
glIsBuffer
(GLuint
buffer
)
GLboolean
glIsSampler
(GLuint
sampler
)
GLboolean
glIsQuery
(GLuint
query
)
GLboolean
glIsSync
(GLuint
sync
)
GLboolean
glIsVertexArray
(GLuint
array
)
GLboolean
glIsTransformFeedback
(GLuint
transform
)
GLboolean
glIsRenderbuffer
(GLuint
renderbuffer
)
GLboolean
glIsFramebuffer
(GLuint
framebuffer
)
specify the name of the respective entity to
determine if the name is in use
texture
,
shader
,
program
,
buffer
,
sampler
,
query
,
sync
,
array
,
transform
,
renderbuffer
,
framebuffer
and Queries
Much of OpenGL ES 3.0's rasterization functionality, like blending or back-
face culling, is controlled by turning on and off the features you need. The
functions controlling the various operations are mentioned here.
