[example] Add shaders_rounded_rectangle example (#4719)
* Add shaders_rounded_rectangle example * Minor tweaks to example template (add star, more) * Combine shaders * Fix changes after review --------- Co-authored-by: Anstro Pleuton <anstropleuton@github.com>
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238
examples/shaders/shaders_rounded_rectangle.c
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examples/shaders/shaders_rounded_rectangle.c
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/*******************************************************************************************
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*
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* raylib [shaders] example - Rounded Rectangle
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*
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* Example complexity rating: [★★★☆] 3/4
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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 Anstro Pleuton (@anstropleuton) 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) 2025-2025 Anstro Pleuton (@anstropleuton)
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*
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********************************************************************************************/
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#include "raylib.h"
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#if defined(PLATFORM_DESKTOP)
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#define GLSL_VERSION 330
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#else // PLATFORM_ANDROID, PLATFORM_WEB
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#define GLSL_VERSION 100
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#endif
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//------------------------------------------------------------------------------------
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// Declare custom Structs
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//------------------------------------------------------------------------------------
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// Rounded rectangle data
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typedef struct {
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Vector4 cornerRadius; // Individual corner radius (top-left, top-right, bottom-left, bottom-right)
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// Shadow variables
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float shadowRadius;
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Vector2 shadowOffset;
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float shadowScale;
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// Border variables
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float borderThickness; // Inner-border thickness
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// Shader locations
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int rectangleLoc;
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int radiusLoc;
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int colorLoc;
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int shadowRadiusLoc;
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int shadowOffsetLoc;
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int shadowScaleLoc;
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int shadowColorLoc;
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int borderThicknessLoc;
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int borderColorLoc;
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} RoundedRectangle;
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//------------------------------------------------------------------------------------
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// Module Functions Declaration
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//------------------------------------------------------------------------------------
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// Create a rounded rectangle and set uniform locations
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static RoundedRectangle CreateRoundedRectangle(Vector4 cornerRadius, float shadowRadius, Vector2 shadowOffset, float shadowScale, float borderThickness, Shader shader);
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// Update rounded rectangle uniforms
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static void UpdateRoundedRectangle(RoundedRectangle rec, Shader shader);
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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 = 800;
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const int screenHeight = 450;
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const Color rectangleColor = BLUE;
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const Color shadowColor = DARKBLUE;
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const Color borderColor = SKYBLUE;
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - Rounded Rectangle");
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// Load the shader
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Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/base.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/rounded_rectangle.fs", GLSL_VERSION));
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// Create a rounded rectangle
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RoundedRectangle roundedRectangle = CreateRoundedRectangle(
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(Vector4){ 5.0f, 10.0f, 15.0f, 20.0f }, // Corner radius
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20.0f, // Shadow radius
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(Vector2){ 0.0f, -5.0f }, // Shadow offset
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0.95f, // Shadow scale
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5.0f, // Border thickness
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shader // Shader
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);
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// Update shader uniforms
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UpdateRoundedRectangle(roundedRectangle, shader);
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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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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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// Draw rectangle box with rounded corners using shader
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Rectangle rec = { 50, 70, 110, 60 };
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DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
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DrawText("Rounded rectangle", rec.x - 20, rec.y - 35, 10, DARKGRAY);
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// Flip Y axis to match shader coordinate system
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rec.y = screenHeight - rec.y - rec.height;
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SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
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// Only rectangle color
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SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { rectangleColor.r/255.0f, rectangleColor.g/255.0f, rectangleColor.b/255.0f, rectangleColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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BeginShaderMode(shader);
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DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
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EndShaderMode();
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// Draw rectangle shadow using shader
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rec = (Rectangle){ 50, 200, 110, 60 };
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DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
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DrawText("Rounded rectangle shadow", rec.x - 20, rec.y - 35, 10, DARKGRAY);
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rec.y = screenHeight - rec.y - rec.height;
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SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
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// Only shadow color
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SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { shadowColor.r/255.0f, shadowColor.g/255.0f, shadowColor.b/255.0f, shadowColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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BeginShaderMode(shader);
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DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
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EndShaderMode();
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// Draw rectangle's border using shader
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rec = (Rectangle){ 50, 330, 110, 60 };
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DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
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DrawText("Rounded rectangle border", rec.x - 20, rec.y - 35, 10, DARKGRAY);
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rec.y = screenHeight - rec.y - rec.height;
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SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
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// Only border color
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SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { borderColor.r/255.0f, borderColor.g/255.0f, borderColor.b/255.0f, borderColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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BeginShaderMode(shader);
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DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
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EndShaderMode();
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// Draw one more rectangle with all three colors
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rec = (Rectangle){ 240, 80, 500, 300 };
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DrawRectangleLines(rec.x - 30, rec.y - 30, rec.width + 60, rec.height + 60, DARKGRAY);
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DrawText("Rectangle with all three combined", rec.x - 30, rec.y - 45, 10, DARKGRAY);
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rec.y = screenHeight - rec.y - rec.height;
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SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
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// All three colors
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SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { rectangleColor.r/255.0f, rectangleColor.g/255.0f, rectangleColor.b/255.0f, rectangleColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { shadowColor.r/255.0f, shadowColor.g/255.0f, shadowColor.b/255.0f, shadowColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { borderColor.r/255.0f, borderColor.g/255.0f, borderColor.b/255.0f, borderColor.a/255.0f }, SHADER_UNIFORM_VEC4);
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BeginShaderMode(shader);
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DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
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EndShaderMode();
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DrawText("(c) Rounded rectangle SDF by Iñigo Quilez. MIT License.", screenWidth - 300, screenHeight - 20, 10, BLACK);
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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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UnloadShader(shader); // Unload shader
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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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//------------------------------------------------------------------------------------
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// Module Functions Definitions
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//------------------------------------------------------------------------------------
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// Create a rounded rectangle and set uniform locations
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RoundedRectangle CreateRoundedRectangle(Vector4 cornerRadius, float shadowRadius, Vector2 shadowOffset, float shadowScale, float borderThickness, Shader shader)
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{
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RoundedRectangle rec;
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rec.cornerRadius = cornerRadius;
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rec.shadowRadius = shadowRadius;
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rec.shadowOffset = shadowOffset;
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rec.shadowScale = shadowScale;
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rec.borderThickness = borderThickness;
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// Get shader uniform locations
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rec.rectangleLoc = GetShaderLocation(shader, "rectangle");
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rec.radiusLoc = GetShaderLocation(shader, "radius");
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rec.colorLoc = GetShaderLocation(shader, "color");
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rec.shadowRadiusLoc = GetShaderLocation(shader, "shadowRadius");
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rec.shadowOffsetLoc = GetShaderLocation(shader, "shadowOffset");
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rec.shadowScaleLoc = GetShaderLocation(shader, "shadowScale");
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rec.shadowColorLoc = GetShaderLocation(shader, "shadowColor");
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rec.borderThicknessLoc = GetShaderLocation(shader, "borderThickness");
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rec.borderColorLoc = GetShaderLocation(shader, "borderColor");
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UpdateRoundedRectangle(rec, shader);
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return rec;
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}
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// Update rounded rectangle uniforms
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void UpdateRoundedRectangle(RoundedRectangle rec, Shader shader)
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{
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SetShaderValue(shader, rec.radiusLoc, (float[]){ rec.cornerRadius.x, rec.cornerRadius.y, rec.cornerRadius.z, rec.cornerRadius.w }, SHADER_UNIFORM_VEC4);
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SetShaderValue(shader, rec.shadowRadiusLoc, &rec.shadowRadius, SHADER_UNIFORM_FLOAT);
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SetShaderValue(shader, rec.shadowOffsetLoc, (float[]){ rec.shadowOffset.x, rec.shadowOffset.y }, SHADER_UNIFORM_VEC2);
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SetShaderValue(shader, rec.shadowScaleLoc, &rec.shadowScale, SHADER_UNIFORM_FLOAT);
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SetShaderValue(shader, rec.borderThicknessLoc, &rec.borderThickness, SHADER_UNIFORM_FLOAT);
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}
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