/**
 * Copyright (c) 2026 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#pragma once
#include "error/error.h"

typedef struct {
  mat4 view;
  mat4 proj;
  mat4 model;

  bool_t isProjectionPerspective;
  Mtx44 matrixProjection;
  Mtx matrixView;
  Mtx matrixModel;
  Mtx matrixModelView;

  uint_fast8_t dirtyMatrix;
} shaderdolphin_t;

typedef struct {
  void *empty;
} shaderdefinitiondolphin_t;

#define SHADER_DOLPHIN_DIRTY_MODEL (1 << 0)
#define SHADER_DOLPHIN_DIRTY_PROJ (1 << 1)
#define SHADER_DOLPHIN_DIRTY_VIEW (1 << 2)

extern shaderdolphin_t *SHADER_BOUND;

/**
 * Initializes a dolphin shader. Basically a render parameter pipeline.
 * 
 * @param shader Shader to initialize.
 * @param def Definition of the shader to initialize with.
 * @return Error code if failure.
 */
errorret_t shaderInitDolphin(
  shaderdolphin_t *shader,
  const shaderdefinitiondolphin_t *def
);

/**
 * Binds a dolphin shader. Basically sets the render parameters for rendering.
 * 
 * @param shader Shader to bind.
 * @return Error code if failure.
 */
errorret_t shaderBindDolphin(shaderdolphin_t *shader);

/**
 * Sets a matrix uniform in the dolphin shader. Basically does nothing.
 * 
 * @param shader Shader to set the matrix in.
 * @param name Name of the uniform to set.
 * @param matrix Matrix to set.
 * @return Error code if failure.
 */
errorret_t shaderSetMatrixDolphin(
  shaderdolphin_t *shader,
  const char_t *name,
  mat4 matrix
);

/**
 * Disposes a dolphin shader. Basically does nothing.
 * 
 * @param shader Shader to dispose.
 * @return Error code if failure.
 */
errorret_t shaderDisposeDolphin(shaderdolphin_t *shader);

/**
 * Internal Dolphin method, called right before a draw call to perform a matrix
 * update and recalc.
 * 
 * @return Error code if failure.
 */
errorret_t shaderUpdateMVPDolphin();

/**
 * Converts a glm style column major mat4 to a GX compatible row major Mtx44.
 * 
 * @param in Matrix to convert.
 * @param out Output converted matrix.
 */
void shaderMat4ToMtx44(const mat4 in, Mtx44 out);

/**
 * Converts a glm style column major mat4 to a GX compatible row major Mtx.
 * 
 * @param inGlmMatrix Matrix to convert.
 * @param outGXMatrix Output converted matrix.
 */
void shaderMat4ToMtx(const mat4 inGlmMatrix, Mtx outGXMatrix);