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/*******************************************************************************************
*
* raylib [shaders] example - Multiple sample2D with default batch system
*
* 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.
*
* NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
* on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
* raylib comes with shaders ready for both versions, check raylib/shaders install folder
*
* This example has been created using raylib 3.5 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2020 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;
static Texture texRed = { 0 };
static Texture texBlue = { 0 };
static Shader shader = { 0 };
static int texBlueLoc = 0;
static int dividerLoc = 0;
static float dividerValue = 0.5f;
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Program Main Entry Point
//----------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib - multiple sample2D");
Image imRed = GenImageColor(800, 450, (Color){ 255, 0, 0, 255 });
texRed = LoadTextureFromImage(imRed);
UnloadImage(imRed);
Image imBlue = GenImageColor(800, 450, (Color){ 0, 0, 255, 255 });
texBlue = LoadTextureFromImage(imBlue);
UnloadImage(imBlue);
shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/color_mix.fs", GLSL_VERSION));
// Get an additional sampler2D location to be enabled on drawing
texBlueLoc = GetShaderLocation(shader, "texture1");
// Get shader uniform for divider
dividerLoc = GetShaderLocation(shader, "divider");
#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); // Unload shader
UnloadTexture(texRed); // Unload texture
UnloadTexture(texBlue); // Unload texture
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//----------------------------------------------------------------------------------
// Module Functions Definitions
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
if (IsKeyDown(KEY_RIGHT)) dividerValue += 0.01f;
else if (IsKeyDown(KEY_LEFT)) dividerValue -= 0.01f;
if (dividerValue < 0.0f) dividerValue = 0.0f;
else if (dividerValue > 1.0f) dividerValue = 1.0f;
SetShaderValue(shader, dividerLoc, ÷rValue, SHADER_UNIFORM_FLOAT);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginShaderMode(shader);
// WARNING: Additional samplers are enabled for all draw calls in the batch,
// EndShaderMode() forces batch drawing and consequently resets active textures
// to let other sampler2D to be activated on consequent drawings (if required)
SetShaderValueTexture(shader, texBlueLoc, texBlue);
// We are drawing texRed using default sampler2D texture0 but
// an additional texture units is enabled for texBlue (sampler2D texture1)
DrawTexture(texRed, 0, 0, WHITE);
EndShaderMode();
DrawText("Use KEY_LEFT/KEY_RIGHT to move texture mixing in shader!", 80, GetScreenHeight() - 40, 20, RAYWHITE);
EndDrawing();
//----------------------------------------------------------------------------------
}
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