OpenGL: Difference between revisions
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Levidsmith (talk | contribs) |
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INTEGER playerVelocityX | INTEGER playerVelocityX | ||
INTEGER playerVelocityY | INTEGER playerVelocityY | ||
Setup_SDL | Setup_SDL | ||
Setup_OpenGL | Setup_OpenGL | ||
Load_Bitmaps | Load_Bitmaps | ||
GameLoop { | GameLoop { | ||
While (User hasn't Quit) { | While (User hasn't Quit) { | ||
IF (User presses up) THEN | IF (User presses up) THEN | ||
playerVelocityY = - PLAYER_SPEED | playerVelocityY = - PLAYER_SPEED | ||
IF (User presses down) THEN | IF (User presses down) THEN | ||
playerVelocityY = PLAYER_SPEED | playerVelocityY = PLAYER_SPEED | ||
IF (User presses left) THEN | IF (User presses left) THEN | ||
playerVelocityX = - PLAYER_SPEED | playerVelocityX = - PLAYER_SPEED | ||
IF (User presses right) THEN | IF (User presses right) THEN | ||
playerVelocityX = PLAYER_SPEED | playerVelocityX = PLAYER_SPEED | ||
playerX = playerX + playerVelocityX | playerX = playerX + playerVelocityX | ||
playerY = playerY + playerVelocityY | playerY = playerY + playerVelocityY | ||
Render_Screen | Render_Screen | ||
} | } | ||
} | } |
Revision as of 05:18, 13 February 2010
I am attempting to integrate OpenGL into the code, so that the game uses hardware graphics acceleration. Hopefully, this will improve some of the framerate issues.
Get code to compile with a single line of OpenGL
I can compile a program using #include "SDL_opengl.h", but I am getting errors about missing functions when an OpenGL method is called.
I installed the OpenGL libraries in cygwin, so I'm not sure if those were necessary:
Installing these files may help
http://www.libsdl.org/extras/win32/cygwin/
Found out that I was using the wrong parameters to compile. I should have been using this:
gcc test.c `sdl-config --libs --cflags` -lglut32 -lglu32 -lopengl32
Display a bitmap to the screen
I got a simple square to display in OpenGL:
Added Tux:
Tux on an image background:
One of the vertices was off, which made the background skewed.
Moving Block
Next Step is to get the player block moving
Pseudo Code:
INTEGER playerX INTEGER playerY INTEGER playerVelocityX INTEGER playerVelocityY Setup_SDL Setup_OpenGL Load_Bitmaps GameLoop { While (User hasn't Quit) { IF (User presses up) THEN playerVelocityY = - PLAYER_SPEED IF (User presses down) THEN playerVelocityY = PLAYER_SPEED IF (User presses left) THEN playerVelocityX = - PLAYER_SPEED IF (User presses right) THEN playerVelocityX = PLAYER_SPEED playerX = playerX + playerVelocityX playerY = playerY + playerVelocityY Render_Screen } }