This repository holds a discontinued version of Minecraft default in-game shader file
Vertex shaders are the only programmable shaders implemented by the CTR-SDK(PICA200). Vertex shaders are written in PICA-specific assembly language. The OpenGL ES 2.0 API loads the executable files and then runs the shaders. The OpenGL ES 2.0 API can load only executable files that have been assembled and linked. You can't load shader files written in GLSL.
Vertex shaders are run from the main function. A main object is an object file that can be assembled from an assembly code file that has a main function. A reference object is an object file that can be assembled from an assembly code file that does not have a main function.
To put a main function in an assembly code file, set the main label at the location where shader execution starts and set the endmain label after the last instruction at the end of the main function.(This is the last instruction in the main function, not the last instruction in the assembly code file.)A reference object only has subroutines and is referenced by a main object to resolve unresolved labels. When the objects are linked to create an executable file, the executable file does not include reference objects that are not referenced by any main objects
Input Registers
Input registers are floating-point registers that store vertex attribute data ("attributes" in OpenGL ES 2.0 applications).
Temporary Registers
Temporary registers are floating-point registers that temporarily maintain calculation results to be reused later. Their values are preserved until they are overwritten.
Floating-Point Constant Registers
Floating-point constant registers are floating-point registers that store constants to use for calculations. Uniforms for OpenGL ES 2.0 applications are stored here.
Output Registers
These registers output data that has been processed by vertex shaders into a later stage of the graphics pipeline.
You can use nintendo 3ds devkit or picasso from devkitpro. If you decided use picasso as assembler, make sure use the file and instructions in homebrew folder.