Changed rl.SetShaderValue etc to take a c.int like in original raylib.h. You should be able to use other values than the ShaderLocationIndex enum, that enum is only for build in things in raylib. Added #any_int on those procs so you can pass both int and also a ShaderLocationIndex.

vendor/raylib/raylib.odin

@@ -984,12 +984,14 @@ foreign lib {
 	LoadShader              :: proc(vsFileName, fsFileName: cstring) -> Shader ---                                                        // Load shader from files and bind default locations
 	LoadShaderFromMemory    :: proc(vsCode, fsCode: cstring) -> Shader ---                                                                // Load shader from code strings and bind default locations
 	IsShaderReady           :: proc(shader: Shader) -> bool ---                                                                           // Check if a shader is ready
-	GetShaderLocation       :: proc(shader: Shader, uniformName: cstring) -> ShaderLocationIndex ---                                                    // Get shader uniform location
-	GetShaderLocationAttrib :: proc(shader: Shader, attribName: cstring)  -> ShaderLocationIndex ---                                                    // Get shader attribute location
-	SetShaderValue          :: proc(shader: Shader, locIndex: ShaderLocationIndex, value: rawptr, uniformType: ShaderUniformDataType) ---               // Set shader uniform value
-	SetShaderValueV         :: proc(shader: Shader, locIndex: ShaderLocationIndex, value: rawptr, uniformType: ShaderUniformDataType, count: c.int) --- // Set shader uniform value vector
-	SetShaderValueMatrix    :: proc(shader: Shader, locIndex: ShaderLocationIndex, mat: Matrix) ---                                                     // Set shader uniform value (matrix 4x4)
-	SetShaderValueTexture   :: proc(shader: Shader, locIndex: ShaderLocationIndex, texture: Texture2D) ---                                              // Set shader uniform value for texture (sampler2d)
+	GetShaderLocation       :: proc(shader: Shader, uniformName: cstring) -> c.int ---                                                    // Get shader uniform location
+	GetShaderLocationAttrib :: proc(shader: Shader, attribName: cstring)  -> c.int ---                                                    // Get shader attribute location
+
+	// We use #any_int here so we can pass ShaderLocationIndex
+	SetShaderValue          :: proc(shader: Shader, #any_int locIndex: c.int, value: rawptr, uniformType: ShaderUniformDataType) ---               // Set shader uniform value
+	SetShaderValueV         :: proc(shader: Shader, #any_int locIndex: c.int, value: rawptr, uniformType: ShaderUniformDataType, count: c.int) --- // Set shader uniform value vector
+	SetShaderValueMatrix    :: proc(shader: Shader, #any_int locIndex: c.int, mat: Matrix) ---                                                     // Set shader uniform value (matrix 4x4)
+	SetShaderValueTexture   :: proc(shader: Shader, #any_int locIndex: c.int, texture: Texture2D) ---                                              // Set shader uniform value for texture (sampler2d)
 	UnloadShader            :: proc(shader: Shader) ---                                                                                   // Unload shader from GPU memory (VRAM)
 
 	// Screen-space-related functions