jyapayne/opengl
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Changed example from quads to triangles

Browse source
This commit is contained in:
Simon Krauter 2014-10-06 18:04:32 +02:00
commit 06c8c3623e
1 changed files with 20 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

27
examples/glut_example.nim
View file

@ -7,20 +7,23 @@ import glu
proc display() {.cdecl.} =
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT) # Clear color and depth buffers
glMatrixMode(GL_MODELVIEW) # To operate on model-view matrix
# Render a color-cube consisting of 6 quads with different colors
glLoadIdentity() # Reset the model-view matrix
glTranslatef(1.5, 0.0, -7.0) # Move right and into the screen
glBegin(GL_QUADS) # Begin drawing the color cube with 6 quads
glTranslatef(1.5, 0.0, -7.0) # Move right and into the screen
# Render a cube consisting of 6 quads
# Each quad consists of 2 triangles
# Each triangle consists of 3 vertices
glBegin(GL_TRIANGLES) # Begin drawing of triangles
# Top face (y = 1.0f)
# Define vertices in counter-clockwise (CCW) order with normal pointing out
glColor3f(0.0, 1.0, 0.0) # Green
glVertex3f( 1.0, 1.0, -1.0)
glVertex3f(-1.0, 1.0, -1.0)
glVertex3f(-1.0, 1.0, 1.0)
glVertex3f( 1.0, 1.0, 1.0)
glVertex3f( 1.0, 1.0, -1.0)
glVertex3f(-1.0, 1.0, 1.0)
# Bottom face (y = -1.0f)
glColor3f(1.0, 0.5, 0.0) # Orange
@ -28,6 +31,8 @@ proc display() {.cdecl.} =
glVertex3f(-1.0, -1.0, 1.0)
glVertex3f(-1.0, -1.0, -1.0)
glVertex3f( 1.0, -1.0, -1.0)
glVertex3f( 1.0, -1.0, 1.0)
glVertex3f(-1.0, -1.0, -1.0)
# Front face (z = 1.0f)
glColor3f(1.0, 0.0, 0.0) # Red
@ -35,6 +40,8 @@ proc display() {.cdecl.} =
glVertex3f(-1.0, 1.0, 1.0)
glVertex3f(-1.0, -1.0, 1.0)
glVertex3f( 1.0, -1.0, 1.0)
glVertex3f( 1.0, 1.0, 1.0)
glVertex3f(-1.0, -1.0, 1.0)
# Back face (z = -1.0f)
glColor3f(1.0, 1.0, 0.0) # Yellow
@ -42,13 +49,17 @@ proc display() {.cdecl.} =
glVertex3f(-1.0, -1.0, -1.0)
glVertex3f(-1.0, 1.0, -1.0)
glVertex3f( 1.0, 1.0, -1.0)
glVertex3f( 1.0, -1.0, -1.0)
glVertex3f(-1.0, 1.0, -1.0)
# Left face (x = -1.0f)
glColor3f(0.0, 0.0, 1.0) # Blue
glVertex3f(-1.0, 1.0, 1.0)
glVertex3f(-1.0, 1.0, -1.0)
glVertex3f(-1.0, -1.0, -1.0)
glVertex3f(-1.0, -1.0, 1.0)
glVertex3f(-1.0, 1.0, 1.0)
glVertex3f(-1.0, -1.0, -1.0)
# Right face (x = 1.0f)
glColor3f(1.0, 0.0, 1.0) # Magenta
@ -56,6 +67,8 @@ proc display() {.cdecl.} =
glVertex3f(1.0, 1.0, 1.0)
glVertex3f(1.0, -1.0, 1.0)
glVertex3f(1.0, -1.0, -1.0)
glVertex3f(1.0, 1.0, -1.0)
glVertex3f(1.0, -1.0, 1.0)
glEnd() # End of drawing