Opengl 2D Texture Rotation - Simples. Or maybe not.

[Andru]

which as far as I know can be read from glGetTexParameteriv but this returns an untyped variable which I have no idea on how to get into a longint...

Use glGetTexLevelParameter with GL_TEXTURE_WIDTH/GL_TEXTURE_HEIGHT instead, because as I see glGetTexParameteriv can't be used with GL_TEXTURE_WIDTH/GL_TEXTURE_HEIGHT.

[User137]

For efficiency sake i recommend saving texture width and height in their corresponding texture object when textures are loaded. You do have them in some array/list? Because imagine drawing 10000 rectangles, you don't want to be calling glGet...() for each one.

[code_glitch]

Once I rotate a texture, the GlWidth and GlHeight attributes associated to it change and need to be updated. The glGet is only called when the width/height of a texture is actually changed, not when drawn.

Edit: Though this still does not solve how to fix the fact that glGet... returns an untped variable which FPC refuses to load into a Longint. Every time I get:

Image.pas(11,26) Error: Incompatible types: got "untyped" expected "LongInt"

[User137]

glGet...() are procedures, not functions. Last parameter is a pointer to variable/array depending on which value is being read.
http://www.opengl.org/sdk/docs/man/x...xParameter.xml