這是使用蓋莫游戲引擎2.1.2測試環境映射的demo
對opengl而言
環境映射主要就圍繞函數glTexEnv工作的
但是其實現起來不是那么容易
該測試例子源于2.1.1版本demo中的球面映射一例
增加的代碼為:
RefPtr<TexEnv> texenv = reflect->GetTexEnv();
texenv->SetEnvColor(Color::Blue);
texenv->SetMode(TEXTURE_ENV_MODE_BLEND);
texenv->SetLodBias(0.2f);
texenv->SetPointSpriteCoordReplace(true);
texenv->SetRGBScale(1.2f);
texenv->SetAlphaScale(0.8f);
texenv->SetCombineMode(TEXTURE_ENV_MODE_INTERPOLATE);
texenv->SetEnvSource0(TEXTURE_ENV_SOURCE_TEXTURE0);
texenv->SetEnvSource1(TEXTURE_ENV_SOURCE_TEXTURE1);
texenv->SetEnvSource2(TEXTURE_ENV_SOURCE_TEXTURE2);
環境映射的操作模式就是從紋理中獲取對應的環境映射指針并設置合適的參數數值
全demo源碼為:
/*!==========================================================================
*
* 蓋莫游戲引擎(GaiMo Game Engine)
*
* 版權所有 (C) 2009-2009 成都蓋莫軟件技術工作室 保留所有權利
* Copyright (C) 成都蓋莫軟件技術工作室. All Rights Reserved.
*
* 了解更多情況,請訪問 http://www.gaimo.net
****************************************************************************/
#include <GEngine/Gaimo.hpp>
using namespace std;
using namespace core;
int main(int argc, char **argv)
{
//! 初始化引擎設備并得到設備指針
RefPtr<Device> device = core::InitDevice("環境映射");
//! 得到引擎場景指針
RefPtr<SceneManager> scenemanager = device->GetSceneManager();
//! 得到引擎資源指針
RefPtr<ResourceManager> resourcemanager = device->GetResourceManager();
//! 獲取引擎紋理管理器指針
RefPtr<TextureManager> texturemanager = resourcemanager->GetTextureManager();
//! 獲取引擎圖形管理器
RefPtr<ImageManager> imagemanager = resourcemanager->GetImageManager();
//! 獲取引擎視頻驅動器
RefPtr<VideoDriver> videodriver = device->GetVideoDriver();
//! 得到圖形和其紋理
RefPtr<Image> image1 = imagemanager->CreateObject("background","..\\image//spheremap//tree.jpg");
RefPtr<Texture> background = texturemanager->CreateObject("background",image1);
background->Generate();
RefPtr<Image> image2 = imagemanager->CreateObject("reflect","..\\image//spheremap//tree1.jpg");
RefPtr<Texture> reflect = texturemanager->CreateSphereMap("reflect",image2);
RefPtr<TexEnv> texenv = reflect->GetTexEnv();
texenv->SetEnvColor(Color::Blue);
texenv->SetMode(TEXTURE_ENV_MODE_BLEND);
texenv->SetLodBias(0.2f);
texenv->SetPointSpriteCoordReplace(true);
texenv->SetRGBScale(1.2f);
texenv->SetAlphaScale(0.8f);
texenv->SetCombineMode(TEXTURE_ENV_MODE_INTERPOLATE);
texenv->SetEnvSource0(TEXTURE_ENV_SOURCE_TEXTURE0);
texenv->SetEnvSource1(TEXTURE_ENV_SOURCE_TEXTURE1);
texenv->SetEnvSource2(TEXTURE_ENV_SOURCE_TEXTURE2);
reflect->Generate();
//! 獲取全局攝像機,設置攝像機參數
core::RefPtr<core::Camera> camera = scenemanager->GetActiveCamera();
camera->SetPosition(Vector3f(0,0,30));
camera->SetView(Vector3f(0,0,0));
camera->SetDirection(Vector3f(0,1,0));
camera->SetViewPort(Recti(0,0,640,480));
camera->SetPerspective(50.0f,640.0f/480.0f,0.1f,300.0f);
videodriver->EnableCulling();
BEGIN_LOOP(device)
videodriver->SetClearBuffer(ENGINE_CLEAR_COLOR | ENGINE_CLEAR_DEPTH);
videodriver->SetClearColor(core::Color::Blue);
camera->Render();
background->AttachRenderTarget();
glBegin(GL_QUADS);
glNormal3f( 0.0f, 0.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-13.0f, -12.0f, 10.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 13.0f, -12.0f, 10.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 13.0f, 12.0f, 10.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-13.0f, 12.0f, 10.0f);
glEnd();
reflect->AttachRenderTarget();
videodriver->RenderSphere(12,32,32);
videodriver->RenderSphere(9,32,32);
videodriver->RenderSphere(6,32,32);
reflect->Destroy();
END_LOOP(device)
return 0;
}
當前測試例子設置環境映射模式為渲染模式
則其效果為:
再貼一次對應的無環境映射的圖片如下:
可以看出蓋莫游戲引擎一直在不斷完善ing.