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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
51 lines
2.8 KiB
Plaintext
51 lines
2.8 KiB
Plaintext
'''_glDrawArrays:''' render primitives from array data
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{{PageSyntax}}
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SUB _glDrawArrays (BYVAL mode AS _UNSIGNED LONG, BYVAL first AS LONG, BYVAL count AS LONG)
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void '''_glDrawArrays'''(GLenum {{Parameter|mode}}, GLint {{Parameter|first}}, GLsizei {{Parameter|count}});
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; mode
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: Specifies what kind of primitives to render. Symbolic constants {{KW|_GL_POINTS}}, {{KW|_GL_LINE_STRIP}}, {{KW|_GL_LINE_LOOP}}, {{KW|_GL_LINES}}, {{KW|_GL_LINE_STRIP_ADJACENCY}}, {{KW|_GL_LINES_ADJACENCY}}, {{KW|_GL_TRIANGLE_STRIP}}, {{KW|_GL_TRIANGLE_FAN}}, {{KW|_GL_TRIANGLES}}, {{KW|_GL_TRIANGLE_STRIP_ADJACENCY}}, {{KW|_GL_TRIANGLES_ADJACENCY}} and {{KW|_GL_PATCHES}} are accepted.
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; first
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: Specifies the starting index in the enabled arrays.
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; count
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: Specifies the number of indices to be rendered.
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{{PageDescription}}
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'''_glDrawArrays''' specifies multiple geometric primitives with very few subroutine calls. Instead of calling a GL procedure to pass each individual vertex, normal, texture coordinate, edge flag, or color, you can prespecify separate arrays of vertices, normals, and colors and use them to construct a sequence of primitives with a single call to '''_glDrawArrays'''.
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When '''_glDrawArrays''' is called, it uses {{Parameter|count}} sequential elements from each enabled array to construct a sequence of geometric primitives, beginning with element {{Parameter|first}}. {{Parameter|mode}} specifies what kind of primitives are constructed and how the array elements construct those primitives.
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Vertex attributes that are modified by '''_glDrawArrays''' have an unspecified value after '''_glDrawArrays''' returns. Attributes that aren't modified remain well defined.
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{{PageNotes}}
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{{KW|_GL_LINE_STRIP_ADJACENCY}}, {{KW|_GL_LINES_ADJACENCY}}, {{KW|_GL_TRIANGLE_STRIP_ADJACENCY}} and {{KW|_GL_TRIANGLES_ADJACENCY}} are available only if the GL version is 3.2 or greater.
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{{PageErrors}}
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{{KW|_GL_INVALID_ENUM}} is generated if {{Parameter|mode}} is not an accepted value.
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{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|count}} is negative.
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{{KW|_GL_INVALID_OPERATION}} is generated if a non-zero buffer object name is bound to an enabled array and the buffer object's data store is currently mapped.
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{{KW|_GL_INVALID_OPERATION}} is generated if a geometry shader is active and {{Parameter|mode}} is incompatible with the input primitive type of the geometry shader in the currently installed program object.
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{{PageSeeAlso}}
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{{KW|_GL}}
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{{KW|_glBindVertexArray}}, {{KW|_glDrawArraysIndirect}}, {{KW|_glDrawArraysInstanced}}, {{KW|_glDrawArraysInstancedBaseInstance}}, {{KW|_glMultiDrawArrays}}, {{KW|_glMultiDrawArraysIndirect}}
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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/]. |