緣起：
為看這個(gè)做知識(shí)儲(chǔ)備，因?yàn)镺penGL不熟悉
玩玩DirectShow--(2) NVIDIA SDK 9.5 GPU Video Effects
截圖：
核心代碼：
渲染
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
camera.apply_inverse_transform();
object.apply_transform();
glRotatef(60.0f, -1.0f, 1.0f, 0.0f );
glBindTexture(GL_TEXTURE_RECTANGLE_NV, tex.texture);
glEnable(GL_TEXTURE_RECTANGLE_NV);
quad.call_list();
glPopMatrix();
glutSwapBuffers();
}
初始化
void init_opengl()
{
if (!glh_extension_supported("GL_EXT_texture_rectangle") &&
!glh_extension_supported("GL_NV_texture_rectangle"))
{
cerr << "Video card does not support texture rectangles" << endl;
quitapp(0);
}
glEnable(GL_DEPTH_TEST);
array2<vec3ub> img;
tex.bind(); // get a texture name and bind it
read_png_rgb("nvlogo_rect.png", img);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB, img.get_width(), img.get_height(), 0,
GL_RGB, GL_UNSIGNED_BYTE, & img(0,0)[0]);
float aspect = img.get_width() / float(img.get_height());
// note texture coordinates use image dimensions, not [0,1]
quad.new_list(GL_COMPILE);
glPushMatrix();
if(aspect > 1)
glScalef(1, 1/aspect, 1);
else
glScalef(aspect, 1, 1);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex3f(-1, -1, 0);
glTexCoord2f(0, img.get_height());
glVertex3f(-1, 1, 0);
glTexCoord2f(img.get_width(), img.get_height());
glVertex3f( 1, 1, 0);
glTexCoord2f(img.get_width(), 0);
glVertex3f( 1, -1, 0);
glEnd();
glPopMatrix();
quad.end_list();
}
posted on 2008-12-24 03:11
七星重劍 閱讀(1416)
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Game Graphics