Class EXTWindowRectangles
This extension provides additional orthogonally aligned "window rectangles" specified in window-space coordinates that restrict rasterization of all primitive types (geometry, images, paths) and framebuffer clears.
When rendering to the framebuffer of an on-screen window, these window rectangles are ignored so these window rectangles apply to rendering to non-zero framebuffer objects only.
From zero to an implementation-dependent limit (specified by MAX_WINDOW_RECTANGLES_EXT
) number of window rectangles can be operational at once. When
one or more window rectangles are active, rasterized fragments can either survive if the fragment is within any of the operational window rectangles
(INCLUSIVE_EXT
mode) or be rejected if the fragment is within any of the operational window rectangles (EXCLUSIVE_EXT
mode).
These window rectangles operate orthogonally to the existing scissor test functionality.
This extension has specification language for both OpenGL and ES so EXT_window_rectangles
can be implemented and advertised for either or both
API contexts.
Requires GL30
or EXT_draw_buffers2
.
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted by themode
parameter ofWindowRectanglesEXT
.static final int
Accepted by themode
parameter ofWindowRectanglesEXT
.static final int
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.static final int
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.static final int
Accepted by thepname
parameter of GetIntegeri_v, GetInteger64i_v, GetBooleani_v, GetFloati_v, GetDoublei_v, GetIntegerIndexedvEXT, GetFloatIndexedvEXT, GetDoubleIndexedvEXT, GetBooleanIndexedvEXT, and GetIntegeri_vEXT.static final int
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev. -
Method Summary
Modifier and TypeMethodDescriptionstatic void
glWindowRectanglesEXT
(int mode, int[] box) Array version of:WindowRectanglesEXT
static void
glWindowRectanglesEXT
(int mode, IntBuffer box) Sets the active window rectangles.static void
nglWindowRectanglesEXT
(int mode, int count, long box) Unsafe version of:WindowRectanglesEXT
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Field Details
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GL_INCLUSIVE_EXT
public static final int GL_INCLUSIVE_EXTAccepted by themode
parameter ofWindowRectanglesEXT
.- See Also:
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GL_EXCLUSIVE_EXT
public static final int GL_EXCLUSIVE_EXTAccepted by themode
parameter ofWindowRectanglesEXT
.- See Also:
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GL_WINDOW_RECTANGLE_EXT
public static final int GL_WINDOW_RECTANGLE_EXTAccepted by thepname
parameter of GetIntegeri_v, GetInteger64i_v, GetBooleani_v, GetFloati_v, GetDoublei_v, GetIntegerIndexedvEXT, GetFloatIndexedvEXT, GetDoubleIndexedvEXT, GetBooleanIndexedvEXT, and GetIntegeri_vEXT.- See Also:
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GL_WINDOW_RECTANGLE_MODE_EXT
public static final int GL_WINDOW_RECTANGLE_MODE_EXTAccepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.- See Also:
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GL_MAX_WINDOW_RECTANGLES_EXT
public static final int GL_MAX_WINDOW_RECTANGLES_EXTAccepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.- See Also:
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GL_NUM_WINDOW_RECTANGLES_EXT
public static final int GL_NUM_WINDOW_RECTANGLES_EXTAccepted by thepname
parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.- See Also:
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Method Details
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nglWindowRectanglesEXT
public static void nglWindowRectanglesEXT(int mode, int count, long box) Unsafe version of:WindowRectanglesEXT
- Parameters:
count
- the number of active window rectangles. Must be between zero and the value ofMAX_WINDOW_RECTANGLES_EXT
.
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glWindowRectanglesEXT
Sets the active window rectangles.When the
WindowRectanglesEXT
command is processed without error, the ith window rectangle box is set to the corresponding four parameters for values ofi
less thenn
. For values ofi
greater thann
, each window rectangle box is set to (0,0,0,0).Each four elements corresponds to the ith window rectangle indicating a box of pixels specified with window-space coordinates. Each window rectangle box
i
has a lower-left origin at(x_i,y_i)
and upper-right corner at(x_i+w_i,y_i+h_i)
.The
INVALID_VALUE
error is generated if any elementw_i
orh_i
, corresponding to each box's respective width and height, is negative.Each rasterized or cleared fragment with a window-space position
(xw,yw)
is within the ith window rectangle box when both of these equations are satisfied for alli
less thann
:x_i ≤ xw < x_i+w_i y_i ≤ yw < y_i+h_i
When the window rectangles mode is
INCLUSIVE_EXT
mode and the bound framebuffer object is non-zero, a fragment passes the window rectangles test if the fragment's window-space position is within at least one of the currentn
active window rectangles; otherwise the window rectangles test fails and the fragment is discarded.When the window rectangles mode is
EXCLUSIVE_EXT
mode and the bound framebuffer object is non-zero, a fragment fails the window rectangles test and is discarded if the fragment's window-space position is within at least one of the currentn
active window rectangles; otherwise the window rectangles test passes and the fragment passes the window rectangles test.When the bound framebuffer object is zero, the window rectangles test always passes.
- Parameters:
mode
- the rectangle mode. One of:INCLUSIVE_EXT
EXCLUSIVE_EXT
box
- an array of4*count
window rectangle coordinates
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glWindowRectanglesEXT
public static void glWindowRectanglesEXT(int mode, @Nullable int[] box) Array version of:WindowRectanglesEXT
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