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b586eafd3b
LINE INPUT will now use the faster method if passed a file handle that has been opened FOR BINARY. As such, the _BLINEINPUT command has been removed. qb64.bas now takes advantage of this for reading from '$include files, at least in Include Manager 1. Some tweaking of internal/source/main.txt was required to get things into a sane state, so I'm holing off changing the compiler any further so the auto-builder can make sure everything's smoothed over. Note: Everything should still compile as normal; I'm just being overcautious.
45 lines
2 KiB
Plaintext
45 lines
2 KiB
Plaintext
'''_glScissor:''' define the scissor box
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{{PageSyntax}}
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SUB _glScissor (BYVAL x AS LONG, BYVAL y AS LONG, BYVAL width AS LONG, BYVAL height AS LONG)
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void '''_glScissor'''(GLint {{Parameter|x}}, GLint {{Parameter|y}}, GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}});
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; x, y
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: Specify the lower left corner of the scissor box. Initially (0, 0).
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; width, height
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: Specify the width and height of the scissor box. When a GL context is first attached to a window, {{Parameter|width}} and {{Parameter|height}} are set to the dimensions of that window.
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{{PageDescription}}
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'''_glScissor''' defines a rectangle, called the scissor box, in window coordinates. The first two arguments, {{Parameter|x}} and {{Parameter|y}}, specify the lower left corner of the box. {{Parameter|width}} and {{Parameter|height}} specify the width and height of the box.
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To enable and disable the scissor test, call {{KW|_glEnable}} and {{KW|_glDisable}} with argument {{KW|_GL_SCISSOR_TEST}}. The test is initially disabled. While the test is enabled, only pixels that lie within the scissor box can be modified by drawing commands. Window coordinates have integer values at the shared corners of frame buffer pixels. {{code|glScissor(0,0,1,1)}} allows modification of only the lower left pixel in the window, and {{code|glScissor(0,0,0,0)}} doesn't allow modification of any pixels in the window.
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When the scissor test is disabled, it is as though the scissor box includes the entire window.
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{{PageErrors}}
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{{KW|_GL_INVALID_VALUE}} is generated if either {{Parameter|width}} or {{Parameter|height}} is negative.
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{{PageUseWith}}
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{{KW|_glGet}} with argument {{KW|_GL_SCISSOR_BOX}}
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{{KW|_glIsEnabled}} with argument {{KW|_GL_SCISSOR_TEST}}
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{{PageSeeAlso}}
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{{KW|_GL}}
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{{KW|_glEnable|(GL_SCISSOR_TEST)}}, {{KW|_glScissorArray}}, {{KW|_glScissorIndexed}}, {{KW|_glViewport}}
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{{PageCopyright}}
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Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see [http://oss.sgi.com/projects/FreeB/ http://oss.sgi.com/projects/FreeB/]. |