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

#include "display/mesh/mesh.h"
#include "assert/assert.h"

errorret_t meshInitGL(
  meshgl_t *mesh,
  const meshprimitivetypegl_t primitiveType,
  const int32_t vertexCount,
  const meshvertex_t *vertices
) {
  assertNotNull(mesh, "Mesh cannot be NULL");
  assertNotNull(vertices, "Vertices cannot be NULL");
  assertTrue(vertexCount > 0, "Vertex count must be greater than 0");

  mesh->primitiveType = primitiveType;
  mesh->vertexCount = vertexCount;
  mesh->vertices = vertices;

  errorOk();
}

errorret_t meshDrawGL(
  const meshgl_t *mesh,
  const int32_t offset,
  const int32_t count
) {
  // PSP style pointer legacy OpenGL
  const GLsizei stride = sizeof(meshvertex_t);

  glColorPointer(
    sizeof(color4b_t),
    GL_UNSIGNED_BYTE,
    stride,
    (const GLvoid*)&mesh->vertices[offset].color
  );
  glTexCoordPointer(
    MESH_VERTEX_UV_SIZE,
    GL_FLOAT,
    stride,
    (const GLvoid*)&mesh->vertices[offset].uv
  );
  glVertexPointer(
    MESH_VERTEX_POS_SIZE,
    GL_FLOAT,
    stride,
    (const GLvoid*)&mesh->vertices[offset].pos
  );

  glDrawArrays(mesh->primitiveType, offset, count);

  errorOk();
}

int32_t meshGetVertexCountGL(const meshgl_t *mesh) {
  return mesh->vertexCount;
}

errorret_t meshDisposeGL(meshgl_t *mesh) {
  // No dynamic resources to free for this mesh implementation
  errorOk();
}