ogmg/skybox.cpp

#include "skybox.h"
#include "utils.h"

void SkyBox::Init(const char * imageDir)
{
	char temp[256];

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "front.bmp");
	mTextures[0] = CreateTexture2DFromBMP(temp);

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "back.bmp");
	mTextures[1] = CreateTexture2DFromBMP(temp);

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "left.bmp");
	mTextures[2] = CreateTexture2DFromBMP(temp);

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "right.bmp");
	mTextures[3] = CreateTexture2DFromBMP(temp);

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "top.bmp");
	mTextures[4] = CreateTexture2DFromBMP(temp);

	memset(temp, 0, 256);
	strcpy(temp, imageDir);
	strcat(temp, "bottom.bmp");
	mTextures[5] = CreateTexture2DFromBMP(temp);

	mFastDrawCall = CreateDisplayList([this]()->void {DrawCommand();});
}

void SkyBox::DrawCommand()
{
	glDisable(GL_LIGHTING);
	glDisable(GL_DEPTH_TEST);
	glEnable(GL_TEXTURE_2D);
	
	glBindTexture(GL_TEXTURE_2D, mTextures[0]);
	glBegin(GL_QUADS);
	glColor4ub(255, 255, 255, 255);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(-0.5f,-0.5f,-0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, -0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -0.5f);
	glEnd();

	glBindTexture(GL_TEXTURE_2D, mTextures[1]);
	glBegin(GL_QUADS);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, 0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
	glEnd();

	glBindTexture(GL_TEXTURE_2D, mTextures[2]);
	glBegin(GL_QUADS);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(-0.5f, -0.5f, -0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
	glEnd();

	glBindTexture(GL_TEXTURE_2D, mTextures[3]);
	glBegin(GL_QUADS);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(0.5f, -0.5f, -0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, 0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(0.5f, 0.5f, -0.5f);
	glEnd();

	glBindTexture(GL_TEXTURE_2D, mTextures[4]);
	glBegin(GL_QUADS);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(-0.5f, 0.5f, -0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(0.5f, 0.5f, -0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, 0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
	glEnd();

	glBindTexture(GL_TEXTURE_2D, mTextures[5]);
	glBegin(GL_QUADS);
	glTexCoord2d(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f);
	glTexCoord2d(1.0f, 1.0f); glVertex3f(0.5f, -0.5f, -0.5f);
	glTexCoord2d(0.0f, 1.0f); glVertex3f(-0.5f, -0.5f, -0.5f);
	glEnd();
}

void SkyBox::Draw()
{
	glCallList(mFastDrawCall);
}