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129 lines
6.2 KiB
C
129 lines
6.2 KiB
C
/*******************************************************************************************
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*
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* raylib [shaders] example - Postprocessing with custom uniform variable
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*
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* NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
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* OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
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*
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* NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
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* on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
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* raylib comes with shaders ready for both versions, check raylib/shaders install folder
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*
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* Example originally created with raylib 1.3, last time updated with raylib 4.0
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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) 2015-2024 Ramon Santamaria (@raysan5)
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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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// 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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SetConfigFlags(FLAG_MSAA_4X_HINT); // Enable Multi Sampling Anti Aliasing 4x (if available)
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - custom uniform variable");
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// Define the camera to look into our 3d world
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Camera camera = { 0 };
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camera.position = (Vector3){ 8.0f, 8.0f, 8.0f }; // Camera position
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camera.target = (Vector3){ 0.0f, 1.5f, 0.0f }; // Camera looking at point
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camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
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camera.fovy = 45.0f; // Camera field-of-view Y
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camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
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Model model = LoadModel("resources/models/barracks.obj"); // Load OBJ model
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Texture2D texture = LoadTexture("resources/models/barracks_diffuse.png"); // Load model texture (diffuse map)
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model.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture; // Set model diffuse texture
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Vector3 position = { 0.0f, 0.0f, 0.0f }; // Set model position
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// Load postprocessing shader
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// NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
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Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/swirl.fs", GLSL_VERSION));
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// Get variable (uniform) location on the shader to connect with the program
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// NOTE: If uniform variable could not be found in the shader, function returns -1
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int swirlCenterLoc = GetShaderLocation(shader, "center");
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float swirlCenter[2] = { (float)screenWidth/2, (float)screenHeight/2 };
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// Create a RenderTexture2D to be used for render to texture
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RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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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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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(&camera, CAMERA_ORBITAL);
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Vector2 mousePosition = GetMousePosition();
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swirlCenter[0] = mousePosition.x;
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swirlCenter[1] = screenHeight - mousePosition.y;
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// Send new value to the shader to be used on drawing
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SetShaderValue(shader, swirlCenterLoc, swirlCenter, SHADER_UNIFORM_VEC2);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginTextureMode(target); // Enable drawing to texture
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ClearBackground(RAYWHITE); // Clear texture background
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BeginMode3D(camera); // Begin 3d mode drawing
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DrawModel(model, position, 0.5f, WHITE); // Draw 3d model with texture
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DrawGrid(10, 1.0f); // Draw a grid
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EndMode3D(); // End 3d mode drawing, returns to orthographic 2d mode
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DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, RED);
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EndTextureMode(); // End drawing to texture (now we have a texture available for next passes)
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BeginDrawing();
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ClearBackground(RAYWHITE); // Clear screen background
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// Enable shader using the custom uniform
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BeginShaderMode(shader);
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// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
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DrawTextureRec(target.texture, (Rectangle){ 0, 0, (float)target.texture.width, (float)-target.texture.height }, (Vector2){ 0, 0 }, WHITE);
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EndShaderMode();
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// Draw some 2d text over drawn texture
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DrawText("(c) Barracks 3D model by Alberto Cano", screenWidth - 220, screenHeight - 20, 10, GRAY);
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DrawFPS(10, 10);
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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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UnloadTexture(texture); // Unload texture
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UnloadModel(model); // Unload model
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UnloadRenderTexture(target); // Unload render texture
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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} |