opengl--紋理

紋理-1維

綁定1維紋理

void LoadAllTextures(void)
{
	static unsigned char roygbiv_image[8][3] =
	{
		{ 0x3f, 0x00, 0x3f }, /* Dark Violet (for 8 colors…) */
		{ 0x7f, 0x00, 0x7f }, /* Violet */
		{ 0xbf, 0x00, 0xbf }, /* Indigo */
		{ 0x00, 0x00, 0xff }, /* Blue */
		{ 0x00, 0xff, 0x00 }, /* Green */
		{ 0xff, 0xff, 0x00 }, /* Yellow */
		{ 0xff, 0x7f, 0x00 }, /* Orange */
		{ 0xff, 0x00, 0x00 }  /* Red */
	};
	glNewList(RainbowTexture = glGenLists(1), GL_COMPILE);
		glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexImage1D(GL_TEXTURE_1D, 0, 3, 8, 0, GL_RGB, GL_UNSIGNED_BYTE,roygbiv_image);
	glEndList();
}

使能1維紋理

glEnable(GL_TEXTURE_1D);
glCallList(RainbowTexture);

繪圖指定頂點座標和紋理座標

glBegin(GL_QUAD_STRIP);
float th, x, y, z;
for (th = 0.0; th <= my