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80 lines
4.9 KiB
Plaintext
80 lines
4.9 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:18:45}}
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'''_glCopyTexImage2D:''' copy pixels into a 2D texture image
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{{PageSyntax}}
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: SUB _glCopyTexImage2D (BYVAL target AS _UNSIGNED LONG, BYVAL level AS LONG, BYVAL internalFormat AS _UNSIGNED LONG, BYVAL x AS LONG, BYVAL y AS LONG, BYVAL width AS LONG, BYVAL height AS LONG, BYVAL border AS LONG)
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: void '''_glCopyTexImage2D'''(GLenum {{Parameter|target}}, GLint {{Parameter|level}}, GLenum {{Parameter|internalformat}}, GLint {{Parameter|x}}, GLint {{Parameter|y}}, GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}}, GLint {{Parameter|border}});
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; target
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: Specifies the target texture. Must be {{KW|_GL_TEXTURE_2D}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, or {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}.
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; level
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: Specifies the level-of-detail number. Level 0 is the base image level. Level ''n'' is the ''n''th mipmap reduction image.
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; internalformat
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: Specifies the internal format of the texture. Must be one of the following symbolic constants: {{KW|_GL_COMPRESSED_RED}}, {{KW|_GL_COMPRESSED_RG}}, {{KW|_GL_COMPRESSED_RGB}}, {{KW|_GL_COMPRESSED_RGBA}}. {{KW|_GL_COMPRESSED_SRGB}}, {{KW|_GL_COMPRESSED_SRGB_ALPHA}}. {{KW|_GL_DEPTH_COMPONENT}}, {{KW|_GL_DEPTH_COMPONENT16}}, {{KW|_GL_DEPTH_COMPONENT24}}, {{KW|_GL_DEPTH_COMPONENT32}}, {{KW|_GL_RED}}, {{KW|_GL_RG}}, {{KW|_GL_RGB}}, {{KW|_GL_R3_G3_B2}}, {{KW|_GL_RGB4}}, {{KW|_GL_RGB5}}, {{KW|_GL_RGB8}}, {{KW|_GL_RGB10}}, {{KW|_GL_RGB12}}, {{KW|_GL_RGB16}}, {{KW|_GL_RGBA}}, {{KW|_GL_RGBA2}}, {{KW|_GL_RGBA4}}, {{KW|_GL_RGB5_A1}}, {{KW|_GL_RGBA8}}, {{KW|_GL_RGB10_A2}}, {{KW|_GL_RGBA12}}, {{KW|_GL_RGBA16}}, {{KW|_GL_SRGB}}, {{KW|_GL_SRGB8}}, {{KW|_GL_SRGB_ALPHA}}, or {{KW|_GL_SRGB8_ALPHA8}}.
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; x, y
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: Specify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.
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; width
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: Specifies the width of the texture image.
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; height
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: Specifies the height of the texture image.
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; border
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: This value must be 0.
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{{PageDescription}}
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'''_glCopyTexImage2D''' defines a two-dimensional texture image, or cube-map texture image with pixels from the current {{KW|_GL_READ_BUFFER}}.
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The screen-aligned pixel rectangle with lower left corner at ({{Parameter|x}}, {{Parameter|y}}) and with a width of {{Parameter|width}} and a height of {{Parameter|height}} defines the texture array at the mipmap level specified by {{Parameter|level}}. {{Parameter|internalformat}} specifies the internal format of the texture array.
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The pixels in the rectangle are processed exactly as if {{KW|_glReadPixels}} had been called, but the process stops just before final conversion. At this point all pixel component values are clamped to the range [0, 1] and then converted to the texture's internal format for storage in the texel array.
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Pixel ordering is such that lower x and y screen coordinates correspond to lower s and t texture coordinates.
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If any of the pixels within the specified rectangle of the current {{KW|_GL_READ_BUFFER}} are outside the window associated with the current rendering context, then the values obtained for those pixels are undefined.
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When {{Parameter|internalformat}} is one of the sRGB types, the GL does not automatically convert the source pixels to the sRGB color space. In this case, the '''_glPixelMap''' function can be used to accomplish the conversion.
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{{PageNotes}}
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1, 2, 3, and 4 are not accepted values for {{Parameter|internalformat}}.
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An image with height or width of 0 indicates a NULL texture.
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{{PageErrors}}
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{{KW|_GL_INVALID_ENUM}} is generated if {{Parameter|target}} is not {{KW|_GL_TEXTURE_2D}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, or {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}.
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{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|level}} is less than 0.
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{{KW|_GL_INVALID_VALUE}} may be generated if {{Parameter|level}} is greater than log<sub>2</sub>(max}, where max is the returned value of {{KW|_GL_MAX_TEXTURE_SIZE}}.
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{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|width}} is less than 0 or greater than {{KW|_GL_MAX_TEXTURE_SIZE}}.
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{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|border}} is not 0.
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{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|internalformat}} is not an accepted format.
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{{KW|_GL_INVALID_OPERATION}} is generated if {{Parameter|internalformat}} is {{KW|_GL_DEPTH_COMPONENT}}, {{KW|_GL_DEPTH_COMPONENT16}}, {{KW|_GL_DEPTH_COMPONENT24}}, or {{KW|_GL_DEPTH_COMPONENT32}} and there is no depth buffer.
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{{PageUseWith}}
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{{KW|_glGetTexImage}}
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{{PageSeeAlso}}
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[[_GL|SUB _GL]]
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{{KW|_glActiveTexture}}, {{KW|_glBindTexture}}, {{KW|_glBindFramebuffer}}, {{KW|_glCopyTexImage1D}}, {{KW|_glCopyImageSubData}}, {{KW|_glCopyTexSubImage1D}}, {{KW|_glCopyTexSubImage2D}}, {{KW|_glReadBuffer}}
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{{PageCopyright}}
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