void TileView::allocateTiles()
{
freeTiles();
pTiles = new Tile[pNumX * pNumY];
}
TileView::~TileView()
{
freeTiles();
}
ShovelerDrawable *shovelerDrawableTilesCreate(unsigned char width, unsigned char height)
{
Tiles *tiles = malloc(sizeof(Tiles));
tiles->width = width;
tiles->height = height;
tiles->vertices = malloc(4 * width * height * sizeof(TilesVertex));
tiles->triangles = malloc(2 * width * height * sizeof(TilesTriangle));
tiles->drawable.data = tiles;
tiles->drawable.draw = drawTiles;
tiles->drawable.free = freeTiles;
for(unsigned char x = 0; x < width; x++) {
for(unsigned char y = 0; y < height; y++) {
unsigned int index = x * height + y;
tiles->vertices[4 * index + 0].position[0] = x;
tiles->vertices[4 * index + 0].position[1] = y;
tiles->vertices[4 * index + 0].uv[0] = 0;
tiles->vertices[4 * index + 0].uv[1] = 0;
tiles->vertices[4 * index + 1].position[0] = x + 1;
tiles->vertices[4 * index + 1].position[1] = y;
tiles->vertices[4 * index + 1].uv[0] = 1;
tiles->vertices[4 * index + 1].uv[1] = 0;
tiles->vertices[4 * index + 2].position[0] = x;
tiles->vertices[4 * index + 2].position[1] = y + 1;
tiles->vertices[4 * index + 2].uv[0] = 0;
tiles->vertices[4 * index + 2].uv[1] = 1;
tiles->vertices[4 * index + 3].position[0] = x + 1;
tiles->vertices[4 * index + 3].position[1] = y + 1;
tiles->vertices[4 * index + 3].uv[0] = 1;
tiles->vertices[4 * index + 3].uv[1] = 1;
tiles->triangles[2 * index + 0].indices[0] = 4 * index + 1;
tiles->triangles[2 * index + 0].indices[1] = 4 * index + 3;
tiles->triangles[2 * index + 0].indices[2] = 4 * index + 0;
tiles->triangles[2 * index + 1].indices[0] = 4 * index + 3;
tiles->triangles[2 * index + 1].indices[1] = 4 * index + 2;
tiles->triangles[2 * index + 1].indices[2] = 4 * index + 0;
}
}
glGenVertexArrays(1, &tiles->vertexArrayObject);
glBindVertexArray(tiles->vertexArrayObject);
glEnableVertexAttribArray(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_POSITION);
glEnableVertexAttribArray(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_UV);
glVertexAttribFormat(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_POSITION, 2, GL_UNSIGNED_BYTE, GL_FALSE, offsetof(TilesVertex, position));
glVertexAttribFormat(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_UV, 2, GL_UNSIGNED_BYTE, GL_FALSE, offsetof(TilesVertex, uv));
glVertexAttribBinding(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_POSITION, 0);
glVertexAttribBinding(SHOVELER_SHADER_PROGRAM_ATTRIBUTE_UV, 0);
glGenBuffers(1, &tiles->vertexBuffer);
glGenBuffers(1, &tiles->indexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, tiles->vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, 4 * width * height * sizeof(TilesVertex), tiles->vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, tiles->indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 2 * width * height * sizeof(TilesTriangle), tiles->triangles, GL_STATIC_DRAW);
if(!shovelerOpenGLCheckSuccess()) {
freeTiles(&tiles->drawable);
return NULL;
}
return &tiles->drawable;
}
