OpenGL第五章圖形標(biāo)準(zhǔn)

1、第五章 圖形標(biāo)準(zhǔn)OpenGLSGI公司開發(fā)最新版本OpenGL 4.1DirectX微軟公司開發(fā)最新版本DirectX 11計(jì)算機(jī)圖形學(xué)基礎(chǔ)OpenGL 特征工業(yè)標(biāo)準(zhǔn)跨平臺(tái)易用性出色的編成特性詳細(xì)的文檔計(jì)算機(jī)圖形學(xué)基礎(chǔ)DirectX多媒體APIs （Direct3D，DirectShow，DirectMusic）高效率，高性能與微軟其他APIs的兼容性計(jì)算機(jī)圖形學(xué)基礎(chǔ)難度大不能跨平臺(tái)升級(jí)多，下為不兼容OpenGL相關(guān)庫OpenGL基本APIOpenGL實(shí)用函數(shù)庫（OpenGL Utility Library，GLU）WGL (Window Graphics Library)OpenGL工具函數(shù)

2、庫（OpenGL Utility Toolkit，GLUT）計(jì)算機(jī)圖形學(xué)基礎(chǔ)GLUT入門計(jì)算機(jī)圖形學(xué)基礎(chǔ)#include void display(void) int main(int argc, char *argv) glutInit(&argc, argv); glutCreateWindow(argv0); glutDisplayFunc(display); glutMainLoop(); return 0; GLUT入門計(jì)算機(jī)圖形學(xué)基礎(chǔ)void display(void) glClear(GL_COLOR_BUFFER_BIT); glFlush(); void init(void)

3、 glClearColor(0.0, 0.0, 1.0, 1.0); int main(int argc, char *argv) glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGBA); glutCreateWindow(argv0); glutDisplayFunc(display); init(); glutMainLoop(); return 0; 圖形的描畫計(jì)算機(jī)圖形學(xué)基礎(chǔ)void display(void) glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_LINE_LOOP); glVertex2

4、d(-0.9, -0.9); glVertex2d(0.9, -0.9); glVertex2d(0.9, 0.9); glVertex2d(-0.9, 0.9); glEnd(); glFlush(); 圖形的描畫計(jì)算機(jī)圖形學(xué)基礎(chǔ)glBegin(GLenum mode);glEnd(); mode： GL_POINTS GL_LINES GL_LINE_STRIP GL_LINE_LOOP GL_TRIANGLES / GL_QUADS GL_TRIANGLE_STRIP /GL_QUAD_STRIP GL_TRIANGLE_FAN GL_POLYGON圖形的描畫計(jì)算機(jī)圖形學(xué)基礎(chǔ)顏色的設(shè)定計(jì)

5、算機(jī)圖形學(xué)基礎(chǔ)void display(void) glClear(GL_COLOR_BUFFER_BIT); glColor3d(1.0, 0.0, 0.0); glBegin(GL_LINE_LOOP); glVertex2d(-0.9, -0.9); glVertex2d(0.9, -0.9); glVertex2d(0.9, 0.9); glVertex2d(-0.9, 0.9); glEnd(); glFlush(); 參數(shù)的型：d:doubleui : unsigned intf: floatus : unsigned shorti: intub : unsigned chars:

6、 shortb : char函數(shù)命名規(guī)則glVertex4dv(GLdouble x, GLdouble y, GLdouble z, GLdouble w ); 參數(shù)的傳遞方法：（無指定）直接 v 指針參數(shù)的個(gè)數(shù)：2，3，4函數(shù)的功能：Color, Material, Light函數(shù)庫：gl, glu, glut齊次坐標(biāo)計(jì)算機(jī)圖形學(xué)基礎(chǔ)非齊次坐標(biāo)到齊次坐標(biāo)齊次坐標(biāo)到非齊次坐標(biāo)例如：坐標(biāo)變換計(jì)算機(jī)圖形學(xué)基礎(chǔ)使用非齊次坐標(biāo)使用齊次坐標(biāo)OpenGL坐標(biāo)變換的步驟Modelview 變換計(jì)算機(jī)圖形學(xué)基礎(chǔ)void gluLookAt(GLdouble eyeX, / 視點(diǎn)位置GLdouble eyeY

7、,GLdouble eyeZ,GLdouble centerX, / 視線的目標(biāo)點(diǎn)GLdouble centerY,GLdouble centerZ,GLdouble upX, / 視線向上的方向GLdouble upY, GLdouble upZ ) ;投影變換void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble zNear, GLdouble zFar ) ; 投影變換void gluPerspective(GLdouble fovy, GLdouble aspect,GLdouble zNear, GLdouble zFar ) ; 投影變換void void glOrtho(GLdouble lef