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Diffstat (limited to 'docs/examples/web/textures/textures_particles_blending.c')
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1 files changed, 163 insertions, 0 deletions
diff --git a/docs/examples/web/textures/textures_particles_blending.c b/docs/examples/web/textures/textures_particles_blending.c new file mode 100644 index 00000000..1ddacf87 --- /dev/null +++ b/docs/examples/web/textures/textures_particles_blending.c @@ -0,0 +1,163 @@ +/******************************************************************************************* +* +* 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" + +#if defined(PLATFORM_WEB) + #include <emscripten/emscripten.h> +#endif + +#define MAX_PARTICLES 200 + +//---------------------------------------------------------------------------------- +// Global Variables Definition +//---------------------------------------------------------------------------------- +int screenWidth = 800; +int screenHeight = 450; + +// 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; + +Particle mouseTail[MAX_PARTICLES]; + +float gravity = 3.0f; + +Texture2D smoke; + +int blending = BLEND_ALPHA; + + +//---------------------------------------------------------------------------------- +// Module Functions Declaration +//---------------------------------------------------------------------------------- +void UpdateDrawFrame(void); // Update and Draw one frame + +//---------------------------------------------------------------------------------- +// Main Enry Point +//---------------------------------------------------------------------------------- +int main() +{ + // Initialization + //-------------------------------------------------------------------------------------- + InitWindow(screenWidth, screenHeight, "raylib [textures] example - particles blending"); + + // 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 = GetRandomValue(0, 360); + mouseTail[i].active = false; + } + + smoke = LoadTexture("resources/smoke.png"); + +#if defined(PLATFORM_WEB) + emscripten_set_main_loop(UpdateDrawFrame, 0, 1); +#else + SetTargetFPS(60); // Set our game to run at 60 frames-per-second + //-------------------------------------------------------------------------------------- + + // Main game loop + while (!WindowShouldClose()) // Detect window close button or ESC key + { + UpdateDrawFrame(); + } +#endif + + // De-Initialization + //-------------------------------------------------------------------------------------- + UnloadTexture(smoke); // Texture unloading + + CloseWindow(); // Close window and OpenGL context + //-------------------------------------------------------------------------------------- + + return 0; +} + +//---------------------------------------------------------------------------------- +// Module Functions Definition +//---------------------------------------------------------------------------------- +void UpdateDrawFrame(void) +{ + // 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, 0, smoke.width, smoke.height }, + (Rectangle){ mouseTail[i].position.x, mouseTail[i].position.y, smoke.width*mouseTail[i].size, smoke.height*mouseTail[i].size }, + (Vector2){ smoke.width*mouseTail[i].size/2, smoke.height*mouseTail[i].size/2 }, 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(); + //---------------------------------------------------------------------------------- +}
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