raylib/examples/shaders/shaders_raymarching.c
2018-12-20 10:40:28 +01:00

106 lines
4.6 KiB
C

/*******************************************************************************************
*
* raylib [shaders] example - Raymarching shapes generation
*
* 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 2.0 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2018 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raymarching");
Camera camera = { 0 };
camera.position = (Vector3){ 2.5f, 2.5f, 3.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 0.0f, 0.7f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 65.0f; // Camera field-of-view Y
SetCameraMode(camera, CAMERA_FREE); // Set camera mode
// Load raymarching shader
// NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
Shader shader = LoadShader(0, "resources/shaders/glsl330/raymarching.fs");
// Get shader locations for required uniforms
int viewEyeLoc = GetShaderLocation(shader, "viewEye");
int viewCenterLoc = GetShaderLocation(shader, "viewCenter");
int viewUpLoc = GetShaderLocation(shader, "viewUp");
int deltaTimeLoc = GetShaderLocation(shader, "deltaTime");
int runTimeLoc = GetShaderLocation(shader, "runTime");
int resolutionLoc = GetShaderLocation(shader, "resolution");
float resolution[2] = { screenWidth, screenHeight };
SetShaderValue(shader, resolutionLoc, resolution, 2);
float runTime = 0.0f;
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
//----------------------------------------------------------------------------------
UpdateCamera(&camera); // Update camera
float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
float cameraTarget[3] = { camera.target.x, camera.target.y, camera.target.z };
float cameraUp[3] = { camera.up.x, camera.up.y, camera.up.z };
float deltaTime = GetFrameTime();
runTime += deltaTime;
// Set shader required uniform values
SetShaderValue(shader, viewEyeLoc, cameraPos, 3);
SetShaderValue(shader, viewCenterLoc, cameraTarget, 3);
SetShaderValue(shader, viewUpLoc, cameraUp, 3);
SetShaderValue(shader, deltaTimeLoc, &deltaTime, 1);
SetShaderValue(shader, runTimeLoc, &runTime, 1);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
// We only draw a white full-screen rectangle,
// frame is generated in shader using raymarching
BeginShaderMode(shader);
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
DrawText("(c) Raymarching shader by Iñigo Quilez. MIT License.", screenWidth - 280, screenHeight - 20, 10, GRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader); // Unload shader
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}