browser/external/raylib-4.5.0/examples/models/models_billboard.c

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2023-09-27 15:02:24 -04:00
/*******************************************************************************************
*
* raylib [models] example - Drawing billboards
*
* Example originally created with raylib 1.3, last time updated with raylib 3.5
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2015-2023 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [models] example - drawing billboards");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 5.0f, 4.0f, 5.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 2.0f, 0.0f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 45.0f; // Camera field-of-view Y
camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
Texture2D bill = LoadTexture("resources/billboard.png"); // Our billboard texture
Vector3 billPositionStatic = { 0.0f, 2.0f, 0.0f }; // Position of static billboard
Vector3 billPositionRotating = { 1.0f, 2.0f, 1.0f }; // Position of rotating billboard
// Entire billboard texture, source is used to take a segment from a larger texture.
Rectangle source = { 0.0f, 0.0f, (float)bill.width, (float)bill.height };
// NOTE: Billboard locked on axis-Y
Vector3 billUp = { 0.0f, 1.0f, 0.0f };
// Rotate around origin
// Here we choose to rotate around the image center
// NOTE: (-1, 1) is the range where origin.x, origin.y is inside the texture
Vector2 rotateOrigin = { 0.0f };
// Distance is needed for the correct billboard draw order
// Larger distance (further away from the camera) should be drawn prior to smaller distance.
float distanceStatic;
float distanceRotating;
float rotation = 0.0f;
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera, CAMERA_ORBITAL);
rotation += 0.4f;
distanceStatic = Vector3Distance(camera.position, billPositionStatic);
distanceRotating = Vector3Distance(camera.position, billPositionRotating);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
DrawGrid(10, 1.0f); // Draw a grid
// Draw order matters!
if (distanceStatic > distanceRotating)
{
DrawBillboard(camera, bill, billPositionStatic, 2.0f, WHITE);
DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, (Vector2) {1.0f, 1.0f}, rotateOrigin, rotation, WHITE);
}
else
{
DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, (Vector2) {1.0f, 1.0f}, rotateOrigin, rotation, WHITE);
DrawBillboard(camera, bill, billPositionStatic, 2.0f, WHITE);
}
EndMode3D();
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadTexture(bill); // Unload texture
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}