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authorbonmas14 <bonmas14@gmail.com>2025-09-20 22:28:15 +0300
committerbonmas14 <bonmas14@gmail.com>2025-09-20 22:28:15 +0300
commitcdda4c4182c9ee068567529715e4a5c68a8efb58 (patch)
tree38a63f62a64018a2d35fc33354f8589fd33b7514 /deps/raylib/examples/textures/textures_image_kernel.c
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+/*******************************************************************************************
+*
+* raylib [textures] example - Image loading and texture creation
+*
+* NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
+*
+* Example originally created with raylib 1.3, last time updated with raylib 1.3
+*
+* 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) 2015-2024 Karim Salem (@kimo-s)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+void NormalizeKernel(float *kernel, int size)
+{
+ float sum = 0.0f;
+ for (int i = 0; i < size; i++) sum += kernel[i];
+
+ if (sum != 0.0f)
+ {
+ for (int i = 0; i < size; i++) kernel[i] /= sum;
+ }
+}
+
+int main(void)
+{
+ // Initialization
+ //--------------------------------------------------------------------------------------
+ const int screenWidth = 800;
+ const int screenHeight = 450;
+
+ InitWindow(screenWidth, screenHeight, "raylib [textures] example - image convolution");
+
+ Image image = LoadImage("resources/cat.png"); // Loaded in CPU memory (RAM)
+
+ float gaussiankernel[] = {
+ 1.0f, 2.0f, 1.0f,
+ 2.0f, 4.0f, 2.0f,
+ 1.0f, 2.0f, 1.0f };
+
+ float sobelkernel[] = {
+ 1.0f, 0.0f, -1.0f,
+ 2.0f, 0.0f, -2.0f,
+ 1.0f, 0.0f, -1.0f };
+
+ float sharpenkernel[] = {
+ 0.0f, -1.0f, 0.0f,
+ -1.0f, 5.0f, -1.0f,
+ 0.0f, -1.0f, 0.0f };
+
+ NormalizeKernel(gaussiankernel, 9);
+ NormalizeKernel(sharpenkernel, 9);
+ NormalizeKernel(sobelkernel, 9);
+
+ Image catSharpend = ImageCopy(image);
+ ImageKernelConvolution(&catSharpend, sharpenkernel, 9);
+
+ Image catSobel = ImageCopy(image);
+ ImageKernelConvolution(&catSobel, sobelkernel, 9);
+
+ Image catGaussian = ImageCopy(image);
+
+ for (int i = 0; i < 6; i++)
+ {
+ ImageKernelConvolution(&catGaussian, gaussiankernel, 9);
+ }
+
+ ImageCrop(&image, (Rectangle){ 0, 0, (float)200, (float)450 });
+ ImageCrop(&catGaussian, (Rectangle){ 0, 0, (float)200, (float)450 });
+ ImageCrop(&catSobel, (Rectangle){ 0, 0, (float)200, (float)450 });
+ ImageCrop(&catSharpend, (Rectangle){ 0, 0, (float)200, (float)450 });
+
+ // Images converted to texture, GPU memory (VRAM)
+ Texture2D texture = LoadTextureFromImage(image);
+ Texture2D catSharpendTexture = LoadTextureFromImage(catSharpend);
+ Texture2D catSobelTexture = LoadTextureFromImage(catSobel);
+ Texture2D catGaussianTexture = LoadTextureFromImage(catGaussian);
+
+ // Once images have been converted to texture and uploaded to VRAM,
+ // they can be unloaded from RAM
+ UnloadImage(image);
+ UnloadImage(catGaussian);
+ UnloadImage(catSobel);
+ UnloadImage(catSharpend);
+
+ 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
+ //----------------------------------------------------------------------------------
+ // TODO: Update your variables here
+ //----------------------------------------------------------------------------------
+
+ // Draw
+ //----------------------------------------------------------------------------------
+ BeginDrawing();
+
+ ClearBackground(RAYWHITE);
+
+ DrawTexture(catSharpendTexture, 0, 0, WHITE);
+ DrawTexture(catSobelTexture, 200, 0, WHITE);
+ DrawTexture(catGaussianTexture, 400, 0, WHITE);
+ DrawTexture(texture, 600, 0, WHITE);
+
+ EndDrawing();
+ //----------------------------------------------------------------------------------
+ }
+
+ // De-Initialization
+ //--------------------------------------------------------------------------------------
+ UnloadTexture(texture);
+ UnloadTexture(catGaussianTexture);
+ UnloadTexture(catSobelTexture);
+ UnloadTexture(catSharpendTexture);
+
+ CloseWindow(); // Close window and OpenGL context
+ //--------------------------------------------------------------------------------------
+
+ return 0;
+}