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glTexImage2D
Content overview
Definition
- void GL_APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, GLvoid const *pixels)
Function
Maps part of the specified texture image to each primitive that is textured into activity. The texture is active when the current fragment shader or vertex shader uses the built-in texture lookup function. Call glTexImage2D to define a texture image. Before that, call glBindTexture to specify the texture ID to be operated. This API allows you to redefine the texture object.
Parameters
Parameter |
Type |
Description |
|---|---|---|
target |
unsigned integer |
Target texture. Must be GL_TEXTURE_2D. |
level |
integer |
Execution detail level. 0 indicates the basic image level, and n indicates level n. |
internalformat |
integer |
Color component of the texture. The options are as follows:
|
width |
integer |
Width of the texture image. Must be a power of 2 (2n). The texture image must support the width of at least 64 material elements. |
height |
integer |
Height of the texture image. Must be a power of 2 (2m). The texture image must support the height of at least 64 material elements. |
border |
integer |
Width of the border. Must be set to 0. |
format |
unsigned integer |
Color format of the pixel data. Its value does not need to be the same as internalformat. For details about the options, please refer to internalformat. |
type |
unsigned integer |
Data type of the specified pixel data. The options are as follows:
|
pixels |
pointer |
Pointer to image data in the specified memory. |
Call Example
- glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, fbo_width, fbo_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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