raylib/examples/shaders_custom_uniform.c

122 lines
5.6 KiB
C

/*******************************************************************************************
*
* raylib [shaders] example - Apply a postprocessing shader and connect a custom uniform variable
*
* 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 1.3 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;
SetConfigFlags(FLAG_MSAA_4X_HINT); // Enable Multi Sampling Anti Aliasing 4x (if available)
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - custom uniform variable");
// Define the camera to look into our 3d world
Camera camera = {{ 3.0f, 3.0f, 3.0f }, { 0.0f, 1.5f, 0.0f }, { 0.0f, 1.0f, 0.0f }, 45.0f };
Model dwarf = LoadModel("resources/model/dwarf.obj"); // Load OBJ model
Texture2D texture = LoadTexture("resources/model/dwarf_diffuse.png"); // Load model texture
SetModelTexture(&dwarf, texture); // Bind texture to model
Vector3 position = { 0.0f, 0.0f, 0.0f }; // Set model position
Shader shader = LoadShader("resources/shaders/base.vs",
"resources/shaders/swirl.fs"); // Load postpro shader
// Get variable (uniform) location on the shader to connect with the program
// NOTE: If uniform variable could not be found in the shader, function returns -1
int swirlCenterLoc = GetShaderLocation(shader, "center");
float swirlCenter[2] = { (float)screenWidth/2, (float)screenHeight/2 };
// NOTE: Old postprocessing system is not flexible enough despite being very easy to use
//SetPostproShader(shader); // Set fullscreen postprocessing shader
// New postprocessing system let the user create multiple RenderTexture2D and perform multiple render passes
RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);
// Setup orbital camera
SetCameraMode(CAMERA_ORBITAL); // Set an orbital camera mode
SetCameraPosition(camera.position); // Set internal camera position to match our camera position
SetCameraTarget(camera.target); // Set internal camera target to match our camera target
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
//----------------------------------------------------------------------------------
Vector2 mousePosition = GetMousePosition();
swirlCenter[0] = mousePosition.x;
swirlCenter[1] = screenHeight - mousePosition.y;
// Send new value to the shader to be used on drawing
SetShaderValue(shader, swirlCenterLoc, swirlCenter, 2);
UpdateCamera(&camera); // Update internal camera and our camera
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginTextureMode(target); // Enable render to texture RenderTexture2D
Begin3dMode(camera);
DrawModel(dwarf, position, 2.0f, WHITE); // Draw 3d model with texture
DrawGrid(10, 1.0f); // Draw a grid
End3dMode();
EndTextureMode(); // End drawing to texture (now we have a texture available for next passes)
SetCustomShader(shader);
// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
DrawTextureRec(target.texture, (Rectangle){ 0, target.texture.height, target.texture.width, -target.texture.height }, (Vector2){ 0, 0 }, WHITE);
SetDefaultShader();
DrawText("(c) Dwarf 3D model by David Moreno", screenWidth - 200, screenHeight - 20, 10, GRAY);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader); // Unload shader
UnloadTexture(texture); // Unload texture
UnloadModel(dwarf); // Unload model
UnloadRenderTexture(target); // Unload render texture
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}