/*******************************************************************************************
*
* raylib [shaders] example - Rounded Rectangle
*
* Example complexity rating: [★★★☆] 3/4
*
* Example originally created with raylib 5.5, last time updated with raylib 5.5
*
* Example contributed by Anstro Pleuton (@anstropleuton) and reviewed by Ramon Santamaria (@raysan5)
*
* 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) 2025-2025 Anstro Pleuton (@anstropleuton)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//------------------------------------------------------------------------------------
// Declare custom Structs
//------------------------------------------------------------------------------------
// Rounded rectangle data
typedef struct {
Vector4 cornerRadius; // Individual corner radius (top-left, top-right, bottom-left, bottom-right)
// Shadow variables
float shadowRadius;
Vector2 shadowOffset;
float shadowScale;
// Border variables
float borderThickness; // Inner-border thickness
// Shader locations
int rectangleLoc;
int radiusLoc;
int colorLoc;
int shadowRadiusLoc;
int shadowOffsetLoc;
int shadowScaleLoc;
int shadowColorLoc;
int borderThicknessLoc;
int borderColorLoc;
} RoundedRectangle;
//------------------------------------------------------------------------------------
// Module Functions Declaration
//------------------------------------------------------------------------------------
// Create a rounded rectangle and set uniform locations
static RoundedRectangle CreateRoundedRectangle(Vector4 cornerRadius, float shadowRadius, Vector2 shadowOffset, float shadowScale, float borderThickness, Shader shader);
// Update rounded rectangle uniforms
static void UpdateRoundedRectangle(RoundedRectangle rec, Shader shader);
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
const Color rectangleColor = BLUE;
const Color shadowColor = DARKBLUE;
const Color borderColor = SKYBLUE;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - Rounded Rectangle");
// Load the shader
Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/base.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/rounded_rectangle.fs", GLSL_VERSION));
// Create a rounded rectangle
RoundedRectangle roundedRectangle = CreateRoundedRectangle(
(Vector4){ 5.0f, 10.0f, 15.0f, 20.0f }, // Corner radius
20.0f, // Shadow radius
(Vector2){ 0.0f, -5.0f }, // Shadow offset
0.95f, // Shadow scale
5.0f, // Border thickness
shader // Shader
);
// Update shader uniforms
UpdateRoundedRectangle(roundedRectangle, shader);
SetTargetFPS(60);
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
// Draw rectangle box with rounded corners using shader
Rectangle rec = { 50, 70, 110, 60 };
DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
DrawText("Rounded rectangle", rec.x - 20, rec.y - 35, 10, DARKGRAY);
// Flip Y axis to match shader coordinate system
rec.y = screenHeight - rec.y - rec.height;
SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
// Only rectangle color
SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { rectangleColor.r/255.0f, rectangleColor.g/255.0f, rectangleColor.b/255.0f, rectangleColor.a/255.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
BeginShaderMode(shader);
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
// Draw rectangle shadow using shader
rec = (Rectangle){ 50, 200, 110, 60 };
DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
DrawText("Rounded rectangle shadow", rec.x - 20, rec.y - 35, 10, DARKGRAY);
rec.y = screenHeight - rec.y - rec.height;
SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
// Only shadow color
SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { shadowColor.r/255.0f, shadowColor.g/255.0f, shadowColor.b/255.0f, shadowColor.a/255.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
BeginShaderMode(shader);
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
// Draw rectangle's border using shader
rec = (Rectangle){ 50, 330, 110, 60 };
DrawRectangleLines(rec.x - 20, rec.y - 20, rec.width + 40, rec.height + 40, DARKGRAY);
DrawText("Rounded rectangle border", rec.x - 20, rec.y - 35, 10, DARKGRAY);
rec.y = screenHeight - rec.y - rec.height;
SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
// Only border color
SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { 0.0f, 0.0f, 0.0f, 0.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { borderColor.r/255.0f, borderColor.g/255.0f, borderColor.b/255.0f, borderColor.a/255.0f }, SHADER_UNIFORM_VEC4);
BeginShaderMode(shader);
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
// Draw one more rectangle with all three colors
rec = (Rectangle){ 240, 80, 500, 300 };
DrawRectangleLines(rec.x - 30, rec.y - 30, rec.width + 60, rec.height + 60, DARKGRAY);
DrawText("Rectangle with all three combined", rec.x - 30, rec.y - 45, 10, DARKGRAY);
rec.y = screenHeight - rec.y - rec.height;
SetShaderValue(shader, roundedRectangle.rectangleLoc, (float[]){ rec.x, rec.y, rec.width, rec.height }, SHADER_UNIFORM_VEC4);
// All three colors
SetShaderValue(shader, roundedRectangle.colorLoc, (float[]) { rectangleColor.r/255.0f, rectangleColor.g/255.0f, rectangleColor.b/255.0f, rectangleColor.a/255.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.shadowColorLoc, (float[]) { shadowColor.r/255.0f, shadowColor.g/255.0f, shadowColor.b/255.0f, shadowColor.a/255.0f }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, roundedRectangle.borderColorLoc, (float[]) { borderColor.r/255.0f, borderColor.g/255.0f, borderColor.b/255.0f, borderColor.a/255.0f }, SHADER_UNIFORM_VEC4);
BeginShaderMode(shader);
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
DrawText("(c) Rounded rectangle SDF by Iñigo Quilez. MIT License.", screenWidth - 300, screenHeight - 20, 10, BLACK);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader); // Unload shader
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//------------------------------------------------------------------------------------
// Module Functions Definitions
//------------------------------------------------------------------------------------
// Create a rounded rectangle and set uniform locations
RoundedRectangle CreateRoundedRectangle(Vector4 cornerRadius, float shadowRadius, Vector2 shadowOffset, float shadowScale, float borderThickness, Shader shader)
{
RoundedRectangle rec;
rec.cornerRadius = cornerRadius;
rec.shadowRadius = shadowRadius;
rec.shadowOffset = shadowOffset;
rec.shadowScale = shadowScale;
rec.borderThickness = borderThickness;
// Get shader uniform locations
rec.rectangleLoc = GetShaderLocation(shader, "rectangle");
rec.radiusLoc = GetShaderLocation(shader, "radius");
rec.colorLoc = GetShaderLocation(shader, "color");
rec.shadowRadiusLoc = GetShaderLocation(shader, "shadowRadius");
rec.shadowOffsetLoc = GetShaderLocation(shader, "shadowOffset");
rec.shadowScaleLoc = GetShaderLocation(shader, "shadowScale");
rec.shadowColorLoc = GetShaderLocation(shader, "shadowColor");
rec.borderThicknessLoc = GetShaderLocation(shader, "borderThickness");
rec.borderColorLoc = GetShaderLocation(shader, "borderColor");
UpdateRoundedRectangle(rec, shader);
return rec;
}
// Update rounded rectangle uniforms
void UpdateRoundedRectangle(RoundedRectangle rec, Shader shader)
{
SetShaderValue(shader, rec.radiusLoc, (float[]){ rec.cornerRadius.x, rec.cornerRadius.y, rec.cornerRadius.z, rec.cornerRadius.w }, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, rec.shadowRadiusLoc, &rec.shadowRadius, SHADER_UNIFORM_FLOAT);
SetShaderValue(shader, rec.shadowOffsetLoc, (float[]){ rec.shadowOffset.x, rec.shadowOffset.y }, SHADER_UNIFORM_VEC2);
SetShaderValue(shader, rec.shadowScaleLoc, &rec.shadowScale, SHADER_UNIFORM_FLOAT);
SetShaderValue(shader, rec.borderThicknessLoc, &rec.borderThickness, SHADER_UNIFORM_FLOAT);
}