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161 lines
5.6 KiB
161 lines
5.6 KiB
/*******************************************************************************************
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*
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* raylib [textures] example - screen buffer
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*
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* Example complexity rating: [★★☆☆] 2/4
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*
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* Example originally created with raylib 5.5, last time updated with raylib 5.5
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*
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* Example contributed by Agnis Aldiņš (@nezvers) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2025 Agnis Aldiņš (@nezvers)
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*
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********************************************************************************************/
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#include "raylib.h"
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#define MAX_COLORS 256
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#define SCREEN_WIDTH 800
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#define SCREEN_HEIGHT 450
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#define SCALE_FACTOR 2
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// buffer size at least for screenImage pixel count
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#define INDEX_BUFFER_SIZE ((SCREEN_WIDTH * SCREEN_HEIGHT) / SCALE_FACTOR)
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#define FLAME_WIDTH (SCREEN_WIDTH / SCALE_FACTOR)
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static void GeneretePalette(Color *palette);
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static void ClearIndexBuffer(unsigned char *buffer, int count);
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = SCREEN_WIDTH;
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const int screenHeight = SCREEN_HEIGHT;
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const int pixelScale = SCALE_FACTOR;
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const int imageWidth = screenWidth / pixelScale;
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const int imageHeight = screenHeight / pixelScale;
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InitWindow(screenWidth, screenHeight, "raylib [textures] example - screen buffer");
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Color palette[MAX_COLORS] = {0};
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unsigned char indexBuffer[INDEX_BUFFER_SIZE] = {0};
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unsigned char flameRootBuffer[FLAME_WIDTH] = {0};
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Image screenImage = GenImageColor(imageWidth, imageHeight, BLACK);
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Texture screenTexture = LoadTextureFromImage(screenImage);
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GeneretePalette(palette);
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ClearIndexBuffer(indexBuffer, INDEX_BUFFER_SIZE);
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ClearIndexBuffer(flameRootBuffer, FLAME_WIDTH);
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Grow flameRoot
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for (int x = 2; x < FLAME_WIDTH; ++x)
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{
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unsigned short flame = flameRootBuffer[x];
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if (flame == 255) continue;
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flame += GetRandomValue(0, 2);
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if (flame > 255) flame = 255;
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flameRootBuffer[x] = flame;
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}
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// transfer flameRoot to indexBuffer
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for (int x = 0; x < FLAME_WIDTH; ++x)
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{
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int i = x + (imageHeight - 1) * imageWidth;
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indexBuffer[i] = flameRootBuffer[x];
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}
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// Clear top row, because it can't move any higher
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for (int x = 0; x < imageWidth; ++x)
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{
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if (indexBuffer[x] == 0) continue;
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indexBuffer[x] = 0;
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}
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// Skip top row, it is already cleared
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for (int y = 1; y < imageHeight; ++y)
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{
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for (int x = 0; x < imageWidth; ++x)
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{
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unsigned i = x + y * imageWidth;
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unsigned char colorIndex = indexBuffer[i];
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if (colorIndex == 0) continue;
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// Move pixel a row above
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indexBuffer[i] = 0;
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int moveX = GetRandomValue(0, 2) - 1;
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int newX = x + moveX;
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if (newX < 0 || newX >= imageWidth) continue;
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unsigned i_above = i - imageWidth + moveX;
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int decay = GetRandomValue(0, 3);
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colorIndex -= (decay < colorIndex) ? decay : colorIndex;
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indexBuffer[i_above] = colorIndex;
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}
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}
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// Update screenImage with palette colors
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for (int y = 1; y < imageHeight; ++y)
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{
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for (int x = 0; x < imageWidth; ++x)
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{
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unsigned i = x + y * imageWidth;
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unsigned char colorIndex = indexBuffer[i];
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Color col = palette[colorIndex];
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ImageDrawPixel(&screenImage, x, y, col);
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}
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}
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UpdateTexture(screenTexture, screenImage.data);
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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const Vector2 origin = (Vector2){0, 0};
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const float rotation = 0.f;
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DrawTextureEx(screenTexture, origin, rotation, pixelScale, WHITE);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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UnloadTexture(screenTexture);
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UnloadImage(screenImage);
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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static void GeneretePalette(Color *palette)
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{
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for (int i = 0; i < MAX_COLORS; ++i)
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{
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float t = (float)i/(float)(MAX_COLORS - 1);
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float hue = t * t;
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float saturation = t;
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float value = t;
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palette[i] = ColorFromHSV(250.f + 150.f * hue, saturation, value);
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}
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}
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static void ClearIndexBuffer(unsigned char *buffer, int count)
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{
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// Use memset to set to ZERO, but for demonstration a plain for loop is used
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for (int i = 0; i < count; ++i)
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{
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buffer[i] = 0;
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}
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}
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