RosettaCodeData/Task/OpenGL/FreeBASIC/opengl.basic

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#include "fbgfx.bi"
#include once "GL/gl.bi"
#include once "GL/glu.bi"
screen 18, 16, , 2
glViewport 0, 0, 640, 480 'Set the viewport
glMatrixMode GL_PROJECTION ' Select projection
glLoadIdentity ' Set this to default
gluPerspective 45.0, 640./480., 0.1, 100.0 ' Set perspective view options
glMatrixMode GL_MODELVIEW ' Set to modelview mode
glLoadIdentity ' ...and set it to default
glClearColor 0.5, 0.5, 0.5, 0.0 ' Set clearscreen color to middle grey
glShadeModel GL_SMOOTH ' set to smooth shading
glClearDepth 1.0 ' Allow the deletion of the depth buffer
glEnable GL_DEPTH_TEST ' turn on depth testing
glDepthFunc GL_LEQUAL ' The Type Of Depth Test To Do
glHint GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ' niceness tweaks
do
glClear GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT ' clear screen and depth
glLoadIdentity
glTranslatef 0.0f, 0.0f, -6.0f ' move camera back so we can see the triangle
glBegin GL_TRIANGLES ' Drawing Using Triangles
glColor3f 1.0f, 0.0f, 0.0f ' red
glVertex3f 0.0f, 1.0f, 0.0f ' Top
glColor3f 0.0f, 1.0f, 0.0f ' green
glVertex3f -1.0f,-1.0f, 0.0f ' Bottom Left
glColor3f 0.0f, 0.0f, 1.0f ' blue
glVertex3f 1.0f,-1.0f, 0.0f ' Bottom Right
glEnd ' Finished Drawing The Triangle
flip
loop while inkey = ""