GPU State Utilities (gpu.state)

This module provides access to the gpu state.

gpu.state.framebuffer_active_get(enable)

Return the active frame-buffer in context.

gpu.state.blend_get()

Current blending equation.

gpu.state.blend_set(mode)

Defines the fixed pipeline blending equation.

Parameters:

mode (str) – The type of blend mode. * NONE No blending. * ALPHA The original color channels are interpolated according to the alpha value. * ALPHA_PREMULT The original color channels are interpolated according to the alpha value with the new colors pre-multiplied by this value. * ADDITIVE The original color channels are added by the corresponding ones. * ADDITIVE_PREMULT The original color channels are added by the corresponding ones that are pre-multiplied by the alpha value. * MULTIPLY The original color channels are multiplied by the corresponding ones. * SUBTRACT The original color channels are subtracted by the corresponding ones. * INVERT The original color channels are replaced by its complementary color.

gpu.state.clip_distances_set(distances_enabled)

Sets the number of gl_ClipDistance planes used for clip geometry.

Parameters:

distances_enabled (int) – Number of clip distances enabled.

gpu.state.color_mask_set(r, g, b, a)

Enable or disable writing of frame buffer color components.

Parameters:

a (r, g, b,) – components red, green, blue, and alpha.

gpu.state.depth_mask_get()

Writing status in the depth component.

gpu.state.depth_mask_set(value)

Write to depth component.

Parameters:

value – True for writing to the depth component.

gpu.state.depth_test_get()

Current depth_test equation.

gpu.state.depth_test_set(mode)

Defines the depth_test equation.

Parameters:

mode (str) – The depth test equation name. Possible values are NONE, ALWAYS, LESS, LESS_EQUAL, EQUAL, GREATER and GREATER_EQUAL.

gpu.state.face_culling_set(culling)

Specify whether none, front-facing or back-facing facets can be culled.

Parameters:

mode (str) – NONE, FRONT or BACK.

gpu.state.front_facing_set(invert)

Specifies the orientation of front-facing polygons.

Parameters:

invert – True for clockwise polygons as front-facing.

gpu.state.line_width_get()

Current width of rasterized lines.

gpu.state.line_width_set(width)

Specify the width of rasterized lines.

Parameters:

size – New width.

gpu.state.point_size_set(size)

Specify the diameter of rasterized points.

Parameters:

size – New diameter.

gpu.state.program_point_size_set(enable)

If enabled, the derived point size is taken from the (potentially clipped) shader builtin gl_PointSize.

Parameters:

enable (bool) – True for shader builtin gl_PointSize.

gpu.state.scissor_get()

Retrieve the scissors of the active framebuffer. Note: Only valid between ‘scissor_set’ and a framebuffer rebind.

Returns:

The scissor of the active framebuffer as a tuple (x, y, xsize, ysize). x, y: lower left corner of the scissor rectangle, in pixels. xsize, ysize: width and height of the scissor rectangle.

Return type:

tuple(int, int, int, int)

gpu.state.scissor_set(x, y, xsize, ysize)

Specifies the scissor area of the active framebuffer. Note: The scissor state is not saved upon framebuffer rebind.

Parameters:

• y (x,) – lower left corner of the scissor rectangle, in pixels.

• ysize (xsize,) – width and height of the scissor rectangle.

gpu.state.scissor_test_set(enable)

Enable/disable scissor testing on the active framebuffer.

Parameters:

enable (bool) – True - enable scissor testing. False - disable scissor testing.

gpu.state.viewport_get()

Viewport of the active framebuffer.

gpu.state.viewport_set(x, y, xsize, ysize)

Specifies the viewport of the active framebuffer. Note: The viewport state is not saved upon framebuffer rebind.

Parameters:

• y (x,) – lower left corner of the viewport_set rectangle, in pixels.

• ysize (xsize,) – width and height of the viewport_set.