glTexImage2D

glTexImage2D is a function in the OpenGL API used to specify a two-dimensional texture image. It is part of the OpenGL 1.0 core specification and is essential for creating and managing texture data in graphics applications. The function is defined as follows:

void glTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);

The parameters of glTexImage2D are as follows:

- target: Specifies the target texture. Must be GL_TEXTURE_2D.

- level: Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.

- internalFormat: Specifies the number of color components in the texture. Must be one of the predefined constants.

- width: Specifies the width of the texture image.

- height: Specifies the height of the texture image.

- border: This value must be 0.

- format: Specifies the format of the pixel data. Must match the internalFormat.

- type: Specifies the data type of the pixel data.

- pixels: Specifies a pointer to the image data in memory.

glTexImage2D is typically used to upload texture data to the GPU. The function can be called multiple times to update different levels of a texture, allowing for the creation of mipmaps. The texture data is stored in the GPU's memory, where it can be efficiently accessed during rendering. glTexImage2D is a fundamental function in OpenGL texture management and is widely used in graphics programming.