/*******************************************************************************************
*
* raylib [shaders] example - julia sets
*
* NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
* OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
*
* NOTE: Shaders used in this example are #version 330 (OpenGL 3.3).
*
* This example has been created using raylib 2.5 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Example contributed by eggmund (@eggmund) and reviewed by Ramon Santamaria (@raysan5)
*
* Copyright (c) 2019 eggmund (@eggmund) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
using System.Numerics;
using static Raylib_cs.Raylib;
namespace Examples.Shaders;
public class JuliaSet
{
const int GlslVersion = 330;
// A few good julia sets
static float[][] PointsOfInterest = new float[][] {
new float[] { -0.348827f, 0.607167f },
new float[] { -0.786268f, 0.169728f },
new float[] { -0.8f, 0.156f },
new float[] { 0.285f, 0.0f },
new float[] { -0.835f, -0.2321f },
new float[] { -0.70176f, -0.3842f },
};
public static int Main()
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - julia sets");
// Load julia set shader
// NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
Shader shader = LoadShader(null, $"resources/shaders/glsl{GlslVersion}/julia_set.fs");
// c constant to use in z^2 + c
float[] c = { PointsOfInterest[0][0], PointsOfInterest[0][1] };
// Offset and zoom to draw the julia set at. (centered on screen and default size)
float[] offset = { -(float)screenWidth / 2, -(float)screenHeight / 2 };
float zoom = 1.0f;
Vector2 offsetSpeed = new(0.0f, 0.0f);
// Get variable (uniform) locations on the shader to connect with the program
// NOTE: If uniform variable could not be found in the shader, function returns -1
int cLoc = GetShaderLocation(shader, "c");
int zoomLoc = GetShaderLocation(shader, "zoom");
int offsetLoc = GetShaderLocation(shader, "offset");
// Tell the shader what the screen dimensions, zoom, offset and c are
float[] screenDims = { (float)screenWidth, (float)screenHeight };
Raylib.SetShaderValue(
shader,
GetShaderLocation(shader, "screenDims"),
screenDims,
ShaderUniformDataType.Vec2
);
Raylib.SetShaderValue(shader, cLoc, c, ShaderUniformDataType.Vec2);
Raylib.SetShaderValue(shader, zoomLoc, zoomLoc, ShaderUniformDataType.Float);
Raylib.SetShaderValue(shader, offsetLoc, offset, ShaderUniformDataType.Vec2);
// Create a RenderTexture2D to be used for render to texture
RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);
// Multiplier of speed to change c value
int incrementSpeed = 0;
// Show controls
bool showControls = true;
// Pause animation
bool pause = false;
SetTargetFPS(60);
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose())
{
// Update
//----------------------------------------------------------------------------------
// Press [1 - 6] to reset c to a point of interest
if (IsKeyPressed(KeyboardKey.One) ||
IsKeyPressed(KeyboardKey.Two) ||
IsKeyPressed(KeyboardKey.Three) ||
IsKeyPressed(KeyboardKey.Four) ||
IsKeyPressed(KeyboardKey.Five) ||
IsKeyPressed(KeyboardKey.Six))
{
if (IsKeyPressed(KeyboardKey.One))
{
c[0] = PointsOfInterest[0][0];
c[1] = PointsOfInterest[0][1];
}
else if (IsKeyPressed(KeyboardKey.Two))
{
c[0] = PointsOfInterest[1][0];
c[1] = PointsOfInterest[1][1];
}
else if (IsKeyPressed(KeyboardKey.Three))
{
c[0] = PointsOfInterest[2][0];
c[1] = PointsOfInterest[2][1];
}
else if (IsKeyPressed(KeyboardKey.Four))
{
c[0] = PointsOfInterest[3][0];
c[1] = PointsOfInterest[3][1];
}
else if (IsKeyPressed(KeyboardKey.Five))
{
c[0] = PointsOfInterest[4][0];
c[1] = PointsOfInterest[4][1];
}
else if (IsKeyPressed(KeyboardKey.Six))
{
c[0] = PointsOfInterest[5][0];
c[1] = PointsOfInterest[5][1];
}
Raylib.SetShaderValue(shader, cLoc, c, ShaderUniformDataType.Vec2);
}
// Pause animation (c change)
if (IsKeyPressed(KeyboardKey.Space))
{
pause = !pause;
}
// Toggle whether or not to show controls
if (IsKeyPressed(KeyboardKey.F1))
{
showControls = !showControls;
}
if (!pause)
{
if (IsKeyPressed(KeyboardKey.Right))
{
incrementSpeed++;
}
else if (IsKeyPressed(KeyboardKey.Left))
{
incrementSpeed--;
}
// TODO: The idea is to zoom and move around with mouse
// Probably offset movement should be proportional to zoom level
if (IsMouseButtonDown(MouseButton.Left) || IsMouseButtonDown(MouseButton.Right))
{
if (IsMouseButtonDown(MouseButton.Left))
{
zoom += zoom * 0.003f;
}
if (IsMouseButtonDown(MouseButton.Right))
{
zoom -= zoom * 0.003f;
}
Vector2 mousePos = GetMousePosition();
offsetSpeed.X = mousePos.X - (float)screenWidth / 2;
offsetSpeed.Y = mousePos.Y - (float)screenHeight / 2;
// Slowly move camera to targetOffset
offset[0] += GetFrameTime() * offsetSpeed.X * 0.8f;
offset[1] += GetFrameTime() * offsetSpeed.Y * 0.8f;
}
else
{
offsetSpeed = new Vector2(0.0f, 0.0f);
}
Raylib.SetShaderValue(shader, zoomLoc, zoom, ShaderUniformDataType.Float);
Raylib.SetShaderValue(shader, offsetLoc, offset, ShaderUniformDataType.Vec2);
// Increment c value with time
float amount = GetFrameTime() * incrementSpeed * 0.0005f;
c[0] += amount;
c[1] += amount;
Raylib.SetShaderValue(shader, cLoc, c, ShaderUniformDataType.Vec2);
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(Color.Black);
// Using a render texture to draw Julia set
// Enable drawing to texture
BeginTextureMode(target);
ClearBackground(Color.Black);
// Draw a rectangle in shader mode to be used as shader canvas
// NOTE: Rectangle uses font Color.white character texture coordinates,
// so shader can not be applied here directly because input vertexTexCoord
// do not represent full screen coordinates (space where want to apply shader)
DrawRectangle(0, 0, GetScreenWidth(), GetScreenHeight(), Color.Black);
EndTextureMode();
// Draw the saved texture and rendered julia set with shader
// NOTE: We do not invert texture on Y, already considered inside shader
BeginShaderMode(shader);
DrawTexture(target.Texture, 0, 0, Color.White);
EndShaderMode();
if (showControls)
{
DrawText("Press Mouse buttons right/left to zoom in/out and move", 10, 15, 10, Color.RayWhite);
DrawText("Press KEY_F1 to toggle these controls", 10, 30, 10, Color.RayWhite);
DrawText("Press KEYS [1 - 6] to change point of interest", 10, 45, 10, Color.RayWhite);
DrawText("Press KEY_LEFT | KEY_RIGHT to change speed", 10, 60, 10, Color.RayWhite);
DrawText("Press KEY_SPACE to pause movement animation", 10, 75, 10, Color.RayWhite);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader);
UnloadRenderTexture(target);
CloseWindow();
//--------------------------------------------------------------------------------------
return 0;
}
}