rayjs/examples/shaders/shaders_texture_outline.c

102 lines
4.1 KiB
C
Raw Normal View History

2023-05-25 21:12:11 +00:00
/*******************************************************************************************
*
* raylib [shaders] example - Apply an shdrOutline to a texture
*
* NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
* OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
*
* Example originally created with raylib 4.0, last time updated with raylib 4.0
*
* Example contributed by Samuel Skiff (@GoldenThumbs) 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) 2021-2023 Samuel SKiff (@GoldenThumbs) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - Apply an outline to a texture");
Texture2D texture = LoadTexture("resources/fudesumi.png");
Shader shdrOutline = LoadShader(0, TextFormat("resources/shaders/glsl%i/outline.fs", GLSL_VERSION));
float outlineSize = 2.0f;
float outlineColor[4] = { 1.0f, 0.0f, 0.0f, 1.0f }; // Normalized RED color
float textureSize[2] = { (float)texture.width, (float)texture.height };
// Get shader locations
int outlineSizeLoc = GetShaderLocation(shdrOutline, "outlineSize");
int outlineColorLoc = GetShaderLocation(shdrOutline, "outlineColor");
int textureSizeLoc = GetShaderLocation(shdrOutline, "textureSize");
// Set shader values (they can be changed later)
SetShaderValue(shdrOutline, outlineSizeLoc, &outlineSize, SHADER_UNIFORM_FLOAT);
SetShaderValue(shdrOutline, outlineColorLoc, outlineColor, SHADER_UNIFORM_VEC4);
SetShaderValue(shdrOutline, textureSizeLoc, textureSize, SHADER_UNIFORM_VEC2);
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
//----------------------------------------------------------------------------------
outlineSize += GetMouseWheelMove();
if (outlineSize < 1.0f) outlineSize = 1.0f;
SetShaderValue(shdrOutline, outlineSizeLoc, &outlineSize, SHADER_UNIFORM_FLOAT);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginShaderMode(shdrOutline);
DrawTexture(texture, GetScreenWidth()/2 - texture.width/2, -30, WHITE);
EndShaderMode();
DrawText("Shader-based\ntexture\noutline", 10, 10, 20, GRAY);
DrawText(TextFormat("Outline size: %i px", (int)outlineSize), 10, 120, 20, MAROON);
DrawFPS(710, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadTexture(texture);
UnloadShader(shdrOutline);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}