Skybox.s3d

#ifndef _SKYBOX
#define _SKYBOX

// skyBox shader definition
var vertexSkyBox = "\
uniform vec3 camPos;\
varying vec3 vTexCoord;\
\
void main(void){\
	vTexCoord = gl_Vertex.xyz;\
	gl_Vertex.xyz += camPos;\
	gl_Position = ftransform();\
}";

var fragmentSkyBox = "\
uniform samplerCube Env;\
varying vec3 vTexCoord;\
\
void main(void){\
	gl_FragColor = vec4(textureCube(Env, normalize(vTexCoord)).rgb, 1.0);\
}";

// crome shader definition
var vertexCrome = "\
varying vec3  Normal;\
varying vec3  EyeDir;\
\
void main(void){\
	gl_Position    = ftransform();\
	Normal         = normalize(gl_NormalMatrix * gl_Normal);\
	EyeDir         = (gl_ModelViewMatrix * gl_Vertex).xyz;\
}";

var fragmentCrome = "\
uniform samplerCube Env;\
\
varying vec3  Normal;\
varying vec3  EyeDir;\
\
void main(void){\
	vec3 reflectDir = reflect(EyeDir, normalize(Normal));\
	gl_FragColor = vec4(textureCube(Env, reflectDir).rgb, 1.0);\
}";

// cubeDiffuse shader definition
var vertexDiffuse = "\
varying vec3  Normal;\
\
void main(void){\
	gl_Position    = ftransform();\
	Normal         = gl_Normal;\
}";

var fragmentDiffuse = "\
uniform samplerCube Env;\
\
varying vec3  Normal;\
\
void main(void){\
	gl_FragColor = vec4(textureCube(Env, normalize(Normal)).rgb, 1.0);\
}";

//meshes
var g_mCube;
//shaders
var g_cromeShader;
var g_cubemapDiffusive;
var g_skyBox;
//textures
var g_tSky;
var g_tDiffuse;

var g_glLib;
#define GL_TEXTURE_CUBE_MAP 0x8513


function InitSkybox(params){
	setlocalDir();

	g_tSky = CVmTexture("Sky128.dds");
	g_mCube = CVmNewMesh(VRP_BOX, 1, [-10, -10, -10], [10, 10, 10]);
	g_mCube.scale(1.0, 1.0, -1.0);	// flip the normals

	g_skyBox = CVmShaderProgram(vertexSkyBox, fragmentSkyBox, true);
	g_skyBox.start();
		g_skyBox.setParameter("Env", 0);
	g_skyBox.stop();

	g_cromeShader = CVmShaderProgram(vertexCrome, fragmentCrome, true);
	g_cromeShader.start();
		g_cromeShader.setParameter("Env", 0);
	g_cromeShader.stop();

	g_cubemapDiffusive = CVmShaderProgram(vertexDiffuse, fragmentDiffuse, true);
	g_cubemapDiffusive.start();
		g_cubemapDiffusive.setParameter("Env", 0);
	g_cubemapDiffusive.stop();
}

function Skybox(){
	var cPos = CameraGetPosition();
	sceneBegin();
	setActiveTexture(g_tSky, VR_NO_FILTER, 0);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	g_skyBox.start();
		g_skyBox.setParameter("camPos", cPos);
		g_mCube.draw();
	g_skyBox.stop();

	glDisable(GL_TEXTURE_CUBE_MAP);
	sceneEnd();
}

/***************************************************************
*                alternative method                            *
***************************************************************/
var skyboxTextures;

function LoadSkyboxTextures()
{

	skyboxTextures = Array(6);

	var texName;

	texName = "skybox\\front.jpg";
	//texName = "skybox\\right.jpg";
	skyboxTextures[0] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[0].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);

	texName = "skybox\\left.jpg";
	//texName = "skybox\\front.jpg";
	skyboxTextures[1] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[1].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);

	texName = "skybox\\back.jpg";
	//texName = "skybox\\left.jpg";
	skyboxTextures[2] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[2].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);


	texName = "skybox\\right.jpg";
	//texName = "skybox\\back.jpg";
	skyboxTextures[3] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[3].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);


	texName = "skybox\\top.jpg";
	skyboxTextures[4] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[4].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);

	texName = "skybox\\bottom.jpg";
	skyboxTextures[5] = CVmTexture(texName);
	//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP);
	glBindTexture(GL_TEXTURE_2D, skyboxTextures[5].id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);
}

function RenderSkybox()
{

	var dir = CameraGetCurrent().GetDirection();
	var SKY_C = 1.5;

	// Store the current matrix
   glPushMatrix();
   glLoadIdentity();
   gluLookAt(
        0,0,0,
        dir[0], dir[1], dir[2],
        0, 1, 0);

   // Enable/Disable features
   //glPushAttrib(GL_ENABLE_BIT);

   //glEnable(GL_TEXTURE_2D);

   glDisable(GL_DEPTH_TEST);

   //glDisable(GL_LIGHTING);
   //glDisable(GL_BLEND);

   // Just in case we set all vertices to white.
   glColor(1,1,1,1);

   // Render the front quad
   SetActiveTexture(skyboxTextures[0]);
   glBindTexture(GL_TEXTURE_2D, skyboxTextures[0].id);
   glBegin(GL_QUADS);
        glTexCoord(1, 1); glVertex( -SKY_C, -SKY_C, -SKY_C );
        glTexCoord(0, 1); glVertex(  SKY_C, -SKY_C, -SKY_C );
        glTexCoord(0, 0); glVertex(  SKY_C,  SKY_C, -SKY_C );
        glTexCoord(1, 0); glVertex( -SKY_C,  SKY_C, -SKY_C );
   glEnd();

   // Render the left quad
   SetActiveTexture(skyboxTextures[1]);
   glBindTexture(GL_TEXTURE_2D, skyboxTextures[1].id);
   glBegin(GL_QUADS);
       glTexCoord(0, 1); glVertex( -SKY_C, -SKY_C, -SKY_C );
       glTexCoord(0, 0); glVertex( -SKY_C,  SKY_C, -SKY_C );
       glTexCoord(1, 0); glVertex( -SKY_C,  SKY_C,  SKY_C );
       glTexCoord(1, 1); glVertex( -SKY_C, -SKY_C,  SKY_C );
   glEnd();


   // Render the right quad
   SetActiveTexture(skyboxTextures[3]);
   glBindTexture(GL_TEXTURE_2D, skyboxTextures[3].id);
   glBegin(GL_QUADS);
       glTexCoord(0, 1); glVertex(  SKY_C, -SKY_C,  SKY_C );
       glTexCoord(0, 0); glVertex(  SKY_C,  SKY_C,  SKY_C );
       glTexCoord(1, 0); glVertex(  SKY_C,  SKY_C, -SKY_C );
       glTexCoord(1, 1); glVertex(  SKY_C, -SKY_C, -SKY_C );
   glEnd();


   // Render the back quad
   SetActiveTexture(skyboxTextures[2]);
   glBindTexture(GL_TEXTURE_2D, skyboxTextures[2].id);
   glBegin(GL_QUADS);
        glTexCoord(0, 1); glVertex( -SKY_C, -SKY_C,  SKY_C );
        glTexCoord(0, 0); glVertex( -SKY_C,  SKY_C,  SKY_C );
        glTexCoord(1, 0); glVertex(  SKY_C,  SKY_C,  SKY_C );
        glTexCoord(1, 1); glVertex(  SKY_C, -SKY_C,  SKY_C );
   glEnd();

   // Render the top quad
   SetActiveTexture(skyboxTextures[4]);
   glBindTexture(GL_TEXTURE_2D, skyboxTextures[4].id);
    glBegin(GL_QUADS);
        glTexCoord(1, 0); glVertex( -SKY_C,  SKY_C, -SKY_C );
        glTexCoord(1, 1); glVertex(  SKY_C,  SKY_C, -SKY_C );
        glTexCoord(0, 1); glVertex(  SKY_C,  SKY_C,  SKY_C );
        glTexCoord(0, 0); glVertex( -SKY_C,  SKY_C,  SKY_C );
   glEnd();

    // Render the bottom quad
	SetActiveTexture(skyboxTextures[5]);
    glBindTexture(GL_TEXTURE_2D, skyboxTextures[5].id);
    glBegin(GL_QUADS);
        glTexCoord(1, 1); glVertex( -SKY_C, -SKY_C, -SKY_C );
        glTexCoord(0, 1); glVertex( -SKY_C, -SKY_C,  SKY_C );
        glTexCoord(0, 0); glVertex(  SKY_C, -SKY_C,  SKY_C );
        glTexCoord(1, 0); glVertex(  SKY_C, -SKY_C, -SKY_C );
    glEnd();

   // Restore enable bits and matrix
   //glPopAttrib();

   glEnable(GL_DEPTH_TEST);

   //glEnable(GL_LIGHTING);
   //glEnable(GL_BLEND);

   //glDepthFunc(GL_LEQUAL);

   glPopMatrix();
}

#endif