RENAMED: TextureFilterMode values
RENAMED: TextureWrapMode values

Updates skybox demo to show how to do both HDR and non HDR skyboxes

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>

Actually, it seems more logical that rlgl takes care of OpenGL data than the models module...

Also, models module loaded vertex data is unloaded by models module.

* Fixing typecast warnings generated by visual studio 2019 in examples.

* Changes to fixes based on feedback

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>

Sorry if this is a bit of a useless pr

Try to avoid a possible false-positive memory leak...

CMake relied on this file for configurations and also was interfering in the regular config.h by having a separate definition if building with CMake. This was not entirely correct so instead we will define compile time definitions separately through CMake (CompileDefinitions.cmake) and also will use the provided EXTERNAL_CONFIG_FLAGS that I found that will not use config.h in through the build process.

I also introduced a new compiler option (CUSTOMIZE_BUILD) that when OFF will use the default config.h and when ON will show other options for redefining your own options.

Fixed an error in rlgl.h where if you have both RLGL_STANDALONE and SUPPORT_VR_SIMULATOR you get a compile time error.

I usually try to avoid any return in the middle of functions, I try to keep them always at the end of the functions.

* Don't create an ortho matrix when the viewport is 0 in any axis.
Not all compilers divide by 0 and return inf, some segfault.
The matrix is not used by anything when minimized, so it just needs to not be called.

* Better fix that always ensures the rlgl matrix is always valid

* Better fix that always ensures the rlgl matrix is always valid

* Add options to set line width and aliasing to rlGL layer.

* Don't do line smoothing in OpenGLES

New implementation allow enabling additional textures per batch only.

This path requires some testing...

Texture type also maps to Texture2D and TextureCubemap

* rlDrawMeshInstanced first attempt

* rlDrawMeshInstanced OpenGL 3.3 and VAO checks

* rlDrawMeshInstanced GetShaderAttribLocation; comments

* example instanced shader

* RLGL_STANDALONE RAYMATH_STANDALONE Vector4

* apply suggested naming changes; add instanced mesh example

* remove orphan variables

- DrawCube() belongs to models.c -> rl*() alternative should be used

Function has been reviewed to avoid any direct OpenGL call and use rlgl functionality, also, GenDrawCube() has been replaced by the internal batch system with DrawCube().

WARNING: rlEnableTexture() call must be issued after enabling the current framebuffer when using batch mechanism because it includes a set of security checks to avoid batch overflow and push/pop matrix operations.

Added some tracelog messages

Functions have been redesigned to use rlgl and allow to externalize them (aka removing them from rlgl because they use custom shaders...).

Required to attach multiple color textures and multiple cubemap faces

This redesign allows more flexibility when creating RenderTexture and a simplification (and hopefully removal) of `GenTexture*()` functions, that should not belong to this model but the user code, due to the use of custom shaders.

Also, this new API opens the door for a possible GBuffers type and advance rendering possibilities...

Some functions of the API have been also simplified or even removed.

rlgl module can be used as an standalone library, so, a version for the library has been added: v3.1.0, matching current raylib version.

Not required anymore, attachment type is queried when required

Avoid unloading default shader, raylib will take care of it