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2018-06-28T21:04:27Z

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wiki>Jwilkins: /* State Latching */

2013-09-23T23:35:53Z

‎State Latching

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= State Latching =

Header File: <tt>GPU_state_latch.h</tt>

In different versions of OpenGL a particular feature may exist, but querying
the underlying state may not be supported. In other cases it is still possible
to query state, but it may be more efficient to go ahead and "latch" the value
when it is set so that it can be retrieved without an ''OpenGL'' API call.

''Note: The term latch comes from electronics, where a latch is basic unit of
memory that can store whether a line was high or low.''

It is important that the every use of an original ''OpenGL'' function is
replaced by the state latching version. Otherwise the state held by the
latch may become inaccurate.

Ultimately, if a way can be found to not have to use state latching, that
is preferable, since the state latch is a global variable.

== Viewport ==

<source lang="c">
void gpuViewport(int x, int y, unsigned int width, unsigned int height);
void gpuGetViewport(int out[4]);
</source>

== Depth Range ==

<source lang="c">
void gpuDepthRange(GLdouble near, GLdouble far);
void gpuGetDepthRange(GLdouble range[2]);
</source>

== Texture Binding ==

<source lang="c">
void gpuBindTexture(GLenum target, GLuint name);
GLuint gpuGetTextureBinding2D(void);
</source>

=== Depth Write Mask ===

<source lang="c">
void gpuDepthMask(GLboolean flag);
GLboolean gpuGetDepthWritemask(void);
</source>

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wiki>Jwilkins: /* State Latching */

Yamyam: 1版をインポートしました