GLAPI/glDepthRangeArray: Difference between revisions
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After clipping and division by ''w'', depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). '''glDepthRangeArray''' specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for each viewport in the range [{{param|first}}, {{param|first}} + {{param|count}}). Thus, the values accepted by '''glDepthRangeArray''' are both clamped to this range before they are accepted. | After clipping and division by ''w'', depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). '''glDepthRangeArray''' specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for each viewport in the range [{{param|first}}, {{param|first}} + {{param|count}}). Thus, the values accepted by '''glDepthRangeArray''' are both clamped to this range before they are accepted. | ||
The {{param|first}} parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of {{ | The {{param|first}} parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of {{enum|GL_MAX_VIEWPORTS}}. {{param|count}} specifies the number of viewports whose depth range to modify. {{param|first}} + {{param|count}} must be less than or equal to the value of {{enum|GL_MAX_VIEWPORTS}}. {{param|v}} specifies the address of an array of pairs of double precision floating point values representing the near and far values of the depth range for each viewport, in that order. | ||
The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized. | The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized. | ||
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== Errors == | == Errors == | ||
{{ | {{enum|GL_INVALID_VALUE}} is generated if {{param|first}} is greater than or equal to the value of {{enum|GL_MAX_VIEWPORTS}}. | ||
{{ | {{enum|GL_INVALID_VALUE}} is generated if {{param|first}} + {{param|count}} is greater than or equal to the value of {{enum|GL_MAX_VIEWPORTS}}. | ||
== Associated Gets == | == Associated Gets == | ||
{{apifunc|glGet}} with argument {{ | {{apifunc|glGet}} with argument {{enum|GL_DEPTH_RANGE}} | ||
== See Also == | == See Also == | ||
Revision as of 17:19, 29 April 2012
| Core in version | 4.6 | |
|---|---|---|
| Core since version | 4.1 | |
| Core ARB extension | ARB_viewport_array | |
glDepthRangeArray: specify mapping of depth values from normalized device coordinates to window coordinates for a specified set of viewports
Function Definition
void glDepthRangeArrayv(GLuint first, GLsizei count, const GLclampd *v);
- first
- Specifies the index of the first viewport whose depth range to update.
- count
- Specifies the number of viewports whose depth range to update.
- v
- Specifies the address of an array containing the near and far values for the depth range of each modified viewport.
Description
After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). glDepthRangeArray specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for each viewport in the range [first, first + count). Thus, the values accepted by glDepthRangeArray are both clamped to this range before they are accepted.
The first parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of GL_MAX_VIEWPORTS. count specifies the number of viewports whose depth range to modify. first + count must be less than or equal to the value of GL_MAX_VIEWPORTS. v specifies the address of an array of pairs of double precision floating point values representing the near and far values of the depth range for each viewport, in that order.
The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized.
Notes
It is not necessary that the near plane distance be less than the far plane distance. Reverse mappings such as nearVal = 1, and farVal = 0 are acceptable.
Errors
GL_INVALID_VALUE is generated if first is greater than or equal to the value of GL_MAX_VIEWPORTS.
GL_INVALID_VALUE is generated if first + count is greater than or equal to the value of GL_MAX_VIEWPORTS.
Associated Gets
glGet with argument GL_DEPTH_RANGE
See Also
glDepthFunc, glDepthRange, glDepthRangeIndexed, glPolygonOffset, glViewportArray, glViewport
Copyright
Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.