135 lines
4.9 KiB
C
135 lines
4.9 KiB
C
/*******************************************************************************************
|
|
*
|
|
* raylib example - particles blending
|
|
*
|
|
* This example has been created using raylib 1.7 (www.raylib.com)
|
|
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
|
|
*
|
|
* Copyright (c) 2017 Ramon Santamaria (@raysan5)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
|
|
#define MAX_PARTICLES 200
|
|
|
|
// Particle structure with basic data
|
|
typedef struct {
|
|
Vector2 position;
|
|
Color color;
|
|
float alpha;
|
|
float size;
|
|
float rotation;
|
|
bool active; // NOTE: Use it to activate/deactive particle
|
|
} Particle;
|
|
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
|
|
InitWindow(screenWidth, screenHeight, "raylib [textures] example - particles blending");
|
|
|
|
// Particles pool, reuse them!
|
|
Particle mouseTail[MAX_PARTICLES] = { 0 };
|
|
|
|
// Initialize particles
|
|
for (int i = 0; i < MAX_PARTICLES; i++)
|
|
{
|
|
mouseTail[i].position = (Vector2){ 0, 0 };
|
|
mouseTail[i].color = (Color){ GetRandomValue(0, 255), GetRandomValue(0, 255), GetRandomValue(0, 255), 255 };
|
|
mouseTail[i].alpha = 1.0f;
|
|
mouseTail[i].size = (float)GetRandomValue(1, 30)/20.0f;
|
|
mouseTail[i].rotation = (float)GetRandomValue(0, 360);
|
|
mouseTail[i].active = false;
|
|
}
|
|
|
|
float gravity = 3.0f;
|
|
|
|
Texture2D smoke = LoadTexture("resources/smoke.png");
|
|
|
|
int blending = BLEND_ALPHA;
|
|
|
|
SetTargetFPS(60);
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
// Main game loop
|
|
while (!WindowShouldClose()) // Detect window close button or ESC key
|
|
{
|
|
// Update
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Activate one particle every frame and Update active particles
|
|
// NOTE: Particles initial position should be mouse position when activated
|
|
// NOTE: Particles fall down with gravity and rotation... and disappear after 2 seconds (alpha = 0)
|
|
// NOTE: When a particle disappears, active = false and it can be reused.
|
|
for (int i = 0; i < MAX_PARTICLES; i++)
|
|
{
|
|
if (!mouseTail[i].active)
|
|
{
|
|
mouseTail[i].active = true;
|
|
mouseTail[i].alpha = 1.0f;
|
|
mouseTail[i].position = GetMousePosition();
|
|
i = MAX_PARTICLES;
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < MAX_PARTICLES; i++)
|
|
{
|
|
if (mouseTail[i].active)
|
|
{
|
|
mouseTail[i].position.y += gravity;
|
|
mouseTail[i].alpha -= 0.01f;
|
|
|
|
if (mouseTail[i].alpha <= 0.0f) mouseTail[i].active = false;
|
|
|
|
mouseTail[i].rotation += 5.0f;
|
|
}
|
|
}
|
|
|
|
if (IsKeyPressed(KEY_SPACE))
|
|
{
|
|
if (blending == BLEND_ALPHA) blending = BLEND_ADDITIVE;
|
|
else blending = BLEND_ALPHA;
|
|
}
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
BeginDrawing();
|
|
|
|
ClearBackground(DARKGRAY);
|
|
|
|
BeginBlendMode(blending);
|
|
|
|
// Draw active particles
|
|
for (int i = 0; i < MAX_PARTICLES; i++)
|
|
{
|
|
if (mouseTail[i].active) DrawTexturePro(smoke, (Rectangle){ 0.0f, 0.0f, (float)smoke.width, (float)smoke.height },
|
|
(Rectangle){ mouseTail[i].position.x, mouseTail[i].position.y, smoke.width*mouseTail[i].size, smoke.height*mouseTail[i].size },
|
|
(Vector2){ (float)(smoke.width*mouseTail[i].size/2.0f), (float)(smoke.height*mouseTail[i].size/2.0f) }, mouseTail[i].rotation,
|
|
Fade(mouseTail[i].color, mouseTail[i].alpha));
|
|
}
|
|
|
|
EndBlendMode();
|
|
|
|
DrawText("PRESS SPACE to CHANGE BLENDING MODE", 180, 20, 20, BLACK);
|
|
|
|
if (blending == BLEND_ALPHA) DrawText("ALPHA BLENDING", 290, screenHeight - 40, 20, BLACK);
|
|
else DrawText("ADDITIVE BLENDING", 280, screenHeight - 40, 20, RAYWHITE);
|
|
|
|
EndDrawing();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
UnloadTexture(smoke);
|
|
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
} |