You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
202 lines
9.2 KiB
202 lines
9.2 KiB
/*******************************************************************************************
|
|
*
|
|
* 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).
|
|
*
|
|
* Example originally created with raylib 2.5, last time updated with raylib 4.0
|
|
*
|
|
* Example contributed by Josh Colclough (@joshcol9232) and reviewed by Ramon Santamaria (@raysan5)
|
|
*
|
|
* 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) 2019-2024 Josh Colclough (@joshcol9232) and Ramon Santamaria (@raysan5)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
|
|
#if defined(PLATFORM_DESKTOP)
|
|
#define GLSL_VERSION 330
|
|
#else // PLATFORM_ANDROID, PLATFORM_WEB
|
|
#define GLSL_VERSION 100
|
|
#endif
|
|
|
|
// A few good julia sets
|
|
const float pointsOfInterest[6][2] =
|
|
{
|
|
{ -0.348827f, 0.607167f },
|
|
{ -0.786268f, 0.169728f },
|
|
{ -0.8f, 0.156f },
|
|
{ 0.285f, 0.0f },
|
|
{ -0.835f, -0.2321f },
|
|
{ -0.70176f, -0.3842f },
|
|
};
|
|
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
const float zoomSpeed = 1.01f;
|
|
const float offsetSpeedMul = 2.0f;
|
|
|
|
const float startingZoom = 0.75f;
|
|
|
|
//------------------------------------------------------------------------------------
|
|
// Program main entry point
|
|
//------------------------------------------------------------------------------------
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
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(0, TextFormat("resources/shaders/glsl%i/julia_set.fs", GLSL_VERSION));
|
|
|
|
// Create a RenderTexture2D to be used for render to texture
|
|
RenderTexture2D target = LoadRenderTexture(GetScreenWidth(), GetScreenHeight());
|
|
|
|
// c constant to use in z^2 + c
|
|
float c[2] = { pointsOfInterest[0][0], pointsOfInterest[0][1] };
|
|
|
|
// Offset and zoom to draw the julia set at. (centered on screen and default size)
|
|
float offset[2] = { 0.0f, 0.0f };
|
|
float zoom = startingZoom;
|
|
|
|
// 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");
|
|
|
|
// Upload the shader uniform values!
|
|
SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2);
|
|
SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT);
|
|
SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2);
|
|
|
|
int incrementSpeed = 0; // Multiplier of speed to change c value
|
|
bool showControls = true; // Show controls
|
|
|
|
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
|
|
//----------------------------------------------------------------------------------
|
|
// Press [1 - 6] to reset c to a point of interest
|
|
if (IsKeyPressed(KEY_ONE) ||
|
|
IsKeyPressed(KEY_TWO) ||
|
|
IsKeyPressed(KEY_THREE) ||
|
|
IsKeyPressed(KEY_FOUR) ||
|
|
IsKeyPressed(KEY_FIVE) ||
|
|
IsKeyPressed(KEY_SIX))
|
|
{
|
|
if (IsKeyPressed(KEY_ONE)) c[0] = pointsOfInterest[0][0], c[1] = pointsOfInterest[0][1];
|
|
else if (IsKeyPressed(KEY_TWO)) c[0] = pointsOfInterest[1][0], c[1] = pointsOfInterest[1][1];
|
|
else if (IsKeyPressed(KEY_THREE)) c[0] = pointsOfInterest[2][0], c[1] = pointsOfInterest[2][1];
|
|
else if (IsKeyPressed(KEY_FOUR)) c[0] = pointsOfInterest[3][0], c[1] = pointsOfInterest[3][1];
|
|
else if (IsKeyPressed(KEY_FIVE)) c[0] = pointsOfInterest[4][0], c[1] = pointsOfInterest[4][1];
|
|
else if (IsKeyPressed(KEY_SIX)) c[0] = pointsOfInterest[5][0], c[1] = pointsOfInterest[5][1];
|
|
|
|
SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2);
|
|
}
|
|
|
|
// If "R" is pressed, reset zoom and offset.
|
|
if (IsKeyPressed(KEY_R))
|
|
{
|
|
zoom = startingZoom;
|
|
offset[0] = 0.0f;
|
|
offset[1] = 0.0f;
|
|
SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT);
|
|
SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2);
|
|
}
|
|
|
|
if (IsKeyPressed(KEY_SPACE)) incrementSpeed = 0; // Pause animation (c change)
|
|
if (IsKeyPressed(KEY_F1)) showControls = !showControls; // Toggle whether or not to show controls
|
|
|
|
if (IsKeyPressed(KEY_RIGHT)) incrementSpeed++;
|
|
else if (IsKeyPressed(KEY_LEFT)) incrementSpeed--;
|
|
|
|
// If either left or right button is pressed, zoom in/out.
|
|
if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
|
|
{
|
|
// Change zoom. If Mouse left -> zoom in. Mouse right -> zoom out.
|
|
zoom *= IsMouseButtonDown(MOUSE_BUTTON_LEFT)? zoomSpeed : 1.0f/zoomSpeed;
|
|
|
|
const Vector2 mousePos = GetMousePosition();
|
|
Vector2 offsetVelocity;
|
|
// Find the velocity at which to change the camera. Take the distance of the mouse
|
|
// from the center of the screen as the direction, and adjust magnitude based on
|
|
// the current zoom.
|
|
offsetVelocity.x = (mousePos.x/(float)screenWidth - 0.5f)*offsetSpeedMul/zoom;
|
|
offsetVelocity.y = (mousePos.y/(float)screenHeight - 0.5f)*offsetSpeedMul/zoom;
|
|
|
|
// Apply move velocity to camera
|
|
offset[0] += GetFrameTime()*offsetVelocity.x;
|
|
offset[1] += GetFrameTime()*offsetVelocity.y;
|
|
|
|
// Update the shader uniform values!
|
|
SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT);
|
|
SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2);
|
|
}
|
|
|
|
// Increment c value with time
|
|
const float dc = GetFrameTime()*(float)incrementSpeed*0.0005f;
|
|
c[0] += dc;
|
|
c[1] += dc;
|
|
SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2);
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
// Using a render texture to draw Julia set
|
|
BeginTextureMode(target); // Enable drawing to texture
|
|
ClearBackground(BLACK); // Clear the render texture
|
|
|
|
// Draw a rectangle in shader mode to be used as shader canvas
|
|
// NOTE: Rectangle uses font 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(), BLACK);
|
|
EndTextureMode();
|
|
|
|
BeginDrawing();
|
|
ClearBackground(BLACK); // Clear screen background
|
|
|
|
// Draw the saved texture and rendered julia set with shader
|
|
// NOTE: We do not invert texture on Y, already considered inside shader
|
|
BeginShaderMode(shader);
|
|
// WARNING: If FLAG_WINDOW_HIGHDPI is enabled, HighDPI monitor scaling should be considered
|
|
// when rendering the RenderTexture2D to fit in the HighDPI scaled Window
|
|
DrawTextureEx(target.texture, (Vector2){ 0.0f, 0.0f }, 0.0f, 1.0f, WHITE);
|
|
EndShaderMode();
|
|
|
|
if (showControls)
|
|
{
|
|
DrawText("Press Mouse buttons right/left to zoom in/out and move", 10, 15, 10, RAYWHITE);
|
|
DrawText("Press KEY_F1 to toggle these controls", 10, 30, 10, RAYWHITE);
|
|
DrawText("Press KEYS [1 - 6] to change point of interest", 10, 45, 10, RAYWHITE);
|
|
DrawText("Press KEY_LEFT | KEY_RIGHT to change speed", 10, 60, 10, RAYWHITE);
|
|
DrawText("Press KEY_SPACE to stop movement animation", 10, 75, 10, RAYWHITE);
|
|
DrawText("Press KEY_R to recenter the camera", 10, 90, 10, RAYWHITE);
|
|
}
|
|
EndDrawing();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
UnloadShader(shader); // Unload shader
|
|
UnloadRenderTexture(target); // Unload render texture
|
|
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|