Texture functions

Allowable texture size height and width in pixels are 8, 16, 32, 64, 128, 256, 512, and 1024. You can load a texture using any combination of the previous values. Only 2D textures are supported. Textures are loaded upside down in keeping with the sprit of OpenGL. Be aware of this when mixing KGL and the PVR API. You may have to flip the V texture coordinates (V = 1 - V) depending upon your application.

void glBindTexture(GLenum target, GLuint texture)

The only supported target is GL_TEXTURE_2D.

void glDeleteTextures(GLsizei n, const GLuint *textures)

void glGenTextures(GLsizei n, GLuint *textures)

void glKosTex2D(GLint internal_fmt, GLsizei width, GLsizei height, pvr_ptr_t txr_address, )

If you have already allocated and loaded a texture you can use this shortcut function to make it available to KGL. The internal_fmt varies from from the OpenGL spec. The table shows the internal formats supported by the PVR2.

internal_fmt

GL_ARGB1555

GL_RGB565

GL_ARGB4444

GL_YUV422

GL_BUMP

GL_ARGB1555_TWID

GL_RGB565_TWID

GL_ARGB4444_TWID

GL_YUV422_TWID

GL_BUMP_TWID

void glTexEnvi(GLenum target, GLenum pname, GLint param)

Setup the texture environment. See the following table for valid arguments to this function.

target	pname	param
GL_TEXTURE_2D	GL_TEXTURE_ENV_MODE	GL_REPLACE
		GL_MODULATE (default)
		GL_DECAL
		GL_MODULATEALPHA

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

Defines a two-dimensional texture. The only supported target is GL_TEXTURE_2D. Border, level, and pixel conversion (type) are not supported. The internalFormat and format arguments must be the same. See the table in section , on page .

void glTexParameteri(GLenum target, GLenum pname, GLint param)

Allows specification of additional texture attributes.

target	pname	param
GL_TEXTURE_2D	GL_TEXTURE_FILTER	GL_FILTER_NONE (default) GL_FILTER_BILINEAR
	GL_TEXTURE_WRAP_S	GL_REPEAT (default) GL_CLAMP
	GL_TEXTURE_WRAP_T	GL_REPEAT (default) GL_CLAMP