rendering bullets in asteroids game

Graphics and GPU Programming Programming

Started by phil67rpg January 12, 2012 01:59 AM

6 comments, last by fastcall22 12 years, 3 months ago

458

Author

January 12, 2012 01:59 AM

well I want to draw a single bullet and move it on the screen for an asteroids game
here is the code I am using
[font="Consolas"][size="2"][color="#0000ff"][font="Consolas"][size="2"][color="#0000ff"][font="Consolas"][size="2"][color="#0000ff"]void[/font][/font][/font][font="Consolas"][size="2"][font="Consolas"][size="2"][color="#000000"] RenderBullet()[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]{[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]glColor3f(0.0f,1.0f,0.0f);[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]glBegin(GL_POINTS);[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]glVertex3f(0.0f,0.5f+k,0.0f);[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]glEnd();[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]k+=0.1f;[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]glutSwapBuffers();[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]}[/font][/font]

Sponji

2,505

January 12, 2012 07:35 AM

Swap buffers only once after you have drawn everything. Don't do it for every bullet, makes no sense.

Derp

phil67rpg

458

Author

January 12, 2012 10:13 PM

can you post some code

assainator

685

January 13, 2012 03:48 PM

[font=Consolas][size=2][color=#0000ff][font=Consolas][size=2][color=#0000ff][font=Consolas][size=2][color=#0000ff]void[/font][/font][/font][font=Consolas][size=2][font=Consolas][size=2][color=#000000] RenderBullet()[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]{[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]glColor3f(0.0f,1.0f,0.0f);[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]glBegin(GL_POINTS);[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]glVertex3f(0.0f,0.5f+k,0.0f);[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]glEnd();[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]k+=0.1f;[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]glutSwapBuffers();[/font][/font]
[font=Consolas][size=2][font=Consolas][size=2]}[/font][/font]

[source]
void RenderFunctionName()
{
// Prepare OGL scene (clearBufferBit, etc.)

// Draw scene
DrawAstroids();
DrawBullets();

// Swap buffers
glutSwapBuffers();
}
[/source]

"What? It disintegrated. By definition, it cannot be fixed." - Gru - Dispicable me

"Dude, the world is only limited by your imagination" - Me

phil67rpg

458

Author

January 14, 2012 03:25 AM

well I am able to draw a single bullet but then my ships disappears.
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"]glClear(GL_COLOR_BUFFER_BIT);[/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][font="Consolas"][size="2"]glColor3f(0.0f,1.0f,0.0f);[/font][/font][/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][font="Consolas"][size="2"]glBegin(GL_POINTS);[/font][/font][/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][font="Consolas"][size="2"]glVertex3f(0.0f,0.5f+k,0.0f);[/font][/font][/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][font="Consolas"][size="2"]k+=0.1f;[/font][/font][/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][font="Consolas"][size="2"]glEnd();[/font][/font][/font][/font][/font]
[font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"][font="Consolas"][size="2"][color="#008000"]glutSwapBuffers();[/font][/font][/font]

SimonForsman

7,644

January 14, 2012 04:34 AM

well I am able to draw a single bullet but then my ships disappears.
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000]glClear(GL_COLOR_BUFFER_BIT);[/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][font=Consolas][size=2]glColor3f(0.0f,1.0f,0.0f);[/font][/font][/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][font=Consolas][size=2]glBegin(GL_POINTS);[/font][/font][/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][font=Consolas][size=2]glVertex3f(0.0f,0.5f+k,0.0f);[/font][/font][/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][font=Consolas][size=2]k+=0.1f;[/font][/font][/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][font=Consolas][size=2]glEnd();[/font][/font][/font][/font][/font]
[font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000][font=Consolas][size=2][color=#008000]glutSwapBuffers();[/font][/font][/font]

Don't swap the buffers after drawing the bullet, only swap buffers at the end of each frame.

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phil67rpg

458

Author

January 14, 2012 05:31 AM

what do you mean by frame

fastcall22

10,917

January 14, 2012 06:49 AM

glutSwapBuffers presents the frame (the rendered image) to the display device. Assisnator's code should hint that for each frame, you should clear the buffer before drawing, and present the buffer after drawing. Your code and the problems you're describing suggest you are mixing quite a few of these within drawing a scene.

rendering bullets in asteroids game

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