psp2spvc - An experimental shader compiler for the Playstation Vita.

psp2spvc is a program that translates between the SPIRV and GXP formats. The goal of the project is to provide an easy, open-source way to generate GXP shaders for the Playstation Vita.

gxmfun shader compatibility:

• clear_f
• clear_v
• color_f
• color_v
• cube_f
• cube_v
• disable_color_buffer_f
• disable_color_buffer_v

The project is still early into its development, shaders can be unstable and many features are not yet implemented. If you found a problem or would like to request a feature, feel free to make an issue.

GLSL

glslangValidator is the only GLSL compiler verified to work. Other GLSL compilers may be supported in the future.

Compile your GLSL as follows:

glslangValidator path/to/input.glsl -V -o path/to/output.spv

A Vulkan target is recommended.

Uniforms

As a workaround to the Vulkan target, uniforms in the default buffer should be defined as follows:

uniform export_name { type self; } reference_name;

export_name is what will be visible in the binary. What will be used for sceGxmProgramFindParameterByName.

reference_name will be the name used in the rest of the shader.

type is the type of the uniform. It can be a struct.

You can refer to the uniform as follows: reference_name.self. OpenGL target/uniform syntax will be provided in the future (minor tweaking is needed).

Usage

psp2spvc must be provided with one input SPIRV file and one output GXP path. The path to the input file should be provided as an argument. The path to the output file must also be provided as argument but must be preceded by -o.

psp2spvc path/to/input.spv -o path/to/output.gxp

Options

Options can be provided as arguments to modify build or print debug information.

Option	Description
-S	Print shader assembly.
-A	Print allocation messages.
-L	Print other debug messages.
-Oreg-space	Enable register space optimization. Required for larger shaders.

Building

You need CMake to build the project. The following commands will prepare and build the project on UNIX based systems.

git submodule update --init --recursive
mkdir build
cmake ..
make

No prebuilt binaries are provided.

Credits

xerpi for the idea, support and gxmfun for testing

pent0, velocity for review and suggestions

waterflame, illusionman1212, frangarcj for testing

Vita3K project for the GXP structs and GXP/USSE research