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/*******************************************************************************************
*
* raylib [textures] example - Texture drawing
*
* This example illustrates how to draw on a blank texture using a shader
*
* This example has been created using raylib 2.0 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Example contributed by Michał Ciesielski and reviewed by Ramon Santamaria (@raysan5)
*
* Copyright (c) 2019 Michał Ciesielski and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
Texture2D texture = { 0 };
Shader shader = { 0 };
static float time = 0.0f; // WARNING: This variable MUST be static, it seems to collide somewhere
int timeLoc = 0;
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Program Main Entry Point
//----------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - texture drawing");
Image imBlank = GenImageColor(1024, 1024, BLANK);
texture = LoadTextureFromImage(imBlank); // Load blank texture to fill on shader
UnloadImage(imBlank);
// NOTE: Using GLSL 330 shader version, on OpenGL ES 2.0 use GLSL 100 shader version
shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/cubes_panning.fs", GLSL_VERSION));
timeLoc = GetShaderLocation(shader, "uTime");
SetShaderValue(shader, timeLoc, &time, SHADER_UNIFORM_FLOAT);
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(UpdateDrawFrame, 60, 1);
#else
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
UpdateDrawFrame();
}
#endif
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
time = GetTime();
SetShaderValue(shader, timeLoc, &time, SHADER_UNIFORM_FLOAT);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginShaderMode(shader); // Enable our custom shader for next shapes/textures drawings
DrawTexture(texture, 0, 0, WHITE); // Drawing BLANK texture, all magic happens on shader
EndShaderMode(); // Disable our custom shader, return to default shader
DrawText("BACKGROUND is PAINTED and ANIMATED on SHADER!", 10, 10, 20, MAROON);
EndDrawing();
//----------------------------------------------------------------------------------
}
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