C is a general-purpose computer programming language used for operating systems, libraries, games and other high performance work.
0
votes
0answers
8 views
Using a pixmap as background for Xlib
I'm having an issue with the Xlib library, coding with C what I would like is using a pixmap as a background but I can't seem to get this right. For anyone with knowledge of this library I'd like an ...
0
votes
0answers
29 views
Mapping intensity in flat shading
I have a 16bit RGB565 and I have the result from dot product and its 0->1.
I would like to map the dot product value from light source to the normal vector in a mesh to 16bit color value.
...
0
votes
1answer
81 views
How to map intensity from dot product to float RGB from 0 to 1?
I'm getting the dot product of the surface normal and light position. The weird thing is the dot product is larger than 1.
Also, I want to map that intensity from 0->1 to Float RGB from 0->1. Here is ...
0
votes
1answer
95 views
Is it possible to use C++ in SDL for Android?
I have successfully compiled SDL for Android using the example, which uses C. Is it possible to use C++ too?
I am trying to port a C++ game which uses SDL 2 to Android.
If it is possible, how can I ...
1
vote
0answers
28 views
Prevent rendering queue from overflowing when using Vsync
My game loop currently looks something like this:
while (!quit) {
takeInput(); // Input is sampled however fast loop can run
time_now = get_time()
time_passed += (time_now - time_prev);
...
3
votes
1answer
92 views
How to pass PNG image data directly to SDL?
Well passing just external PNG to SDL is very easy with the SDL_image library. I have a class that does just that. The code looks like the following:
SDL_Surface* Texture::LoadImg(const char *...
4
votes
1answer
42 views
OpenGL Perspective Issue
I'm trying to troubleshoot a problem with my simple OpenGL test program, which I've written in C. I've written some math routines to do the matrix manipulation, but even after copying known working ...
0
votes
1answer
38 views
C & SDL: Unexpected Behaviour with Renderer
I'm creating a clone of the memory testing game SIMON. My program is simply four differently colored squares that light up one at a time in a random order. I wrote some code that lights up one square, ...
0
votes
1answer
21 views
Setting Square to Dim in Color on MOUSEUP
I'm trying to create a simple recreation of the popular memory game "Simon" using C and SDL2. The idea is that the game is a small window with four squares of different colors that are purposefully ...
0
votes
0answers
68 views
Is this the correct method for collision detection
i'm trying to write a 3d game from scratch. Firstly i created a floor in the zx plane and a man to walk around the environment. When I added walls i was detecting them using the intersection of the ...
1
vote
0answers
14 views
C99: Dynamic dispatch in math library depending on SIMD [closed]
Say I am developing a Math library and I want it to be such that it will detect whether or not user's machine support SSE (and which version) and based on that, different functions will be called. I ...
1
vote
3answers
242 views
What is the lowest-level way of making graphics from scratch?
I am currently trying to get into game development and trying to understand 3D games. I would like to learn to code from scratch without any 3D engines. Some of the things I found was libraries like ...
0
votes
1answer
20 views
How to get rid of an image upon collision detection in SDL?
I am fairly new to SDL in C, but I have written a simple game whereby a character has to reach the end of a level and avoid bad stars on the way. If he hits a star, he dies. There are also good stars ...
0
votes
0answers
26 views
Get coordinates of the 3D object clicked on in OpenGL with gluUnProject
I'm making a game with SDL and OpenGL and I want to get the coordinates of the 3D object that I click. This is basically what my code to get these coordinates looks like:
#define WINDOW_HEIGHT 487
...
1
vote
1answer
27 views
Custom Tile Collision Detection Has Trouble With Edges
So, I'm writing my own game to expand on my abilities as a programmer. However, I have come to a writer's-block of sorts. The game I am building uses tile collision, but allows the player to be in an ...
20
votes
7answers
5k views
What advantage do OpenGL, SFML and SDL have over software rendering?
I started watching the Handmade Hero stream, where Casey Muratori creates a game engine without using frameworks or such.
Yesterday I got to the part where he showed how an image is drawn onto the ...
3
votes
1answer
207 views
Having issue's with a confusing access violation? - C , OpenGL 3.3+ , SDL 2.0+
Hello this code seems so well done and yet I'm getting this weird access violation error when I use anything but 0 in glShaderSources 2nd argument :
glShaderSource( fragshader, 0, fragfilebuff, NULL )...
2
votes
0answers
86 views
GLSL shader with light colors wrong on nvidia optimus
So, I built some code to draw a spinning cube with a red light on the right side, and a blue one on the left.
I run it on my laptop with optimus graphics, and on my desktop with nvidia. On the laptop, ...
0
votes
1answer
40 views
What causes SFML pollEvent to segfault here?
I'm writing an SFML application in C. Currently sfRenderWindow_pollEvent() and sfRenderWindow_waitEvent() always segfault.
Here's the cleaned code that shows the issue.
sfRenderWindow* window;
...
0
votes
1answer
95 views
Simulate Keyboard Button Press [SDL Library]
I am trying to simulate an SDL keyboard button press (using C). I have looked up the SDL info pages online but I still don't have anything that consistently works.
I have the following (removed the ...
0
votes
1answer
85 views
csfml wait event
I would like to spawn a separate thread to deal with inputs using c and sfml.
I made a prototype that waits for input in main() and it works fine.
I made a prototype that spawns a new thread and waits ...
3
votes
1answer
288 views
Creating a Roguelike game in C
I'm trying to create a simple rogue-like game in ncurses in a C program.
The idea here is that, I'd parse a file like this:
10X10 ds2 de2 dw5
12X12 ds3 de2 dw1
14X14 ds5 de1 dw5
10X10 ds5 de3 dw5 ...
0
votes
0answers
77 views
Grapling hook in 2D platform game (C programing)
I'm new in the programming world and I'm studying programming for video games, and I'm trying to create a game for a class project.
I need my character to throw a grappling hook into a specific "rock"...
0
votes
1answer
176 views
OpenGL dynamic font glyph cache library
I have begun work on an OpenGL application (all on my own and with little knowledge) and started with FTGL, rendering true type fonts, which, with alot of text has a great impact on frames per second.
...
-4
votes
2answers
65 views
Confused about arrays in C [closed]
Hey guys I am learning the basics of C language and I am a little bit confused about how to use arrays.
I mean what are they used for?
-2
votes
1answer
129 views
how is c useful in game development [closed]
I know that C++ is the king in game development especially in the AAA market can anyone tell my how is C helpful I am a Computer Science student in my first year and are they any aspects of C i have ...
6
votes
1answer
222 views
How to execute game logic every 100ms but render as fast as possible?
I have created a simple snake clone and would like to execute game logic every 100ms while rendering as fast as possible. How can I achieve this when the program might run with very different frame ...
1
vote
0answers
47 views
Having trouble making game time pause and unpause
I've been trying to make it where when the player does a certain task, the game's time will pause. When the player does another action, the game's time would unpause and continue. I had my code like ...
2
votes
0answers
129 views
SDL2 SDL_CreateTexture returns pointer to existing texture
I have an initialized renderer in SDL2 that works fine.
I create some textures from images using SDL_CreateTextureFromSurface and store them in a vector.
Afterwards, I create an empty texture so as ...
0
votes
1answer
42 views
traversing the area
i want to move point along spiral like hexagon for example i want to traverse the whole area and my player (point) is standing where i have placed it manually. now i want to start from this point and ...
0
votes
0answers
117 views
How do I extract the right information from my projection matrix for frustum culling?
I've tried several different tutorials for Frustum culling, however I cannot understand them.
Here's my function that sets up my projection matrix (someone else helped me with this, but I don't know ...
1
vote
1answer
337 views
Quaternion rotations & transforms from global to local space
I am trying to solve this problem and getting no where,
could really use some assistance.
Rotation is defined as X (rotate left/right), Y(rotate up/down), Z(roll)
Coordinates are X: Forward/backward, ...
1
vote
1answer
442 views
Setting up an efficient OpenGL rendering loop
This is the code that I use to setup my shader
char* vertexShaderSource = getResource("vert.shad");
char* fragmentShaderSource = getResource("frag.shad");
vshad = readFile(vertexShaderSource);
fshad ...
0
votes
1answer
66 views
opengl matrix multiplication
Can someone provide some type of example of multiplying a 4x4 matrix without using loops?
typedef struct matrix4
{
data[16];
} m4;
can someone provide a sample of how you you'd multiply two of ...
0
votes
1answer
70 views
a shader type class in c
Is it possible to setup something sort of like a class in C++ but in c in the simplest terms? I want to avoid using c++ but I would like to create a simple struct that has glsl shader program.
for ...
0
votes
1answer
53 views
Segmentation fault on reallocation of memory but why? [closed]
I have been learning to code in C from this amazing resource http://c.learncodethehardway.org/book/
I am on exercise 17. Basically creating your own simple database using Malloc. I modified the ...
0
votes
1answer
43 views
Cannot Get The Texture Showed Up Correctly glDrawElements
I still have this problem almost 1 month. Tried to search on Google but did not find any solution to this. I have loaded all the data correctly but don't know why the texture came up like this.
Here ...
0
votes
2answers
405 views
Move towards view direction opengl?
I'm trying to get the basics of 3d with opengl 2.0(I know, I know, it's deprecated etc, etc. It's just for the sake of prototyping). I'm trying to get a cube on the screen which you can move around. I ...
3
votes
1answer
331 views
2D day night mapping
I'm looking for this kind of effect MINUS the lights and snow (Another problem).
It needs to change depending on the time of year.
Doesn't need snow or city lights.
Now I'm pretty new to shaders (...
1
vote
1answer
272 views
Registering a C++ callback with Lua API without additional libraries
Basically, I'm trying to register a callback into a Lua state like this:
class MyClass
{
public:
int myLuaFunction(lua_State* L)
{
//do something
}
};
I want ...
0
votes
2answers
210 views
Is there any easy way to understand the Alpha Beta for Othello?
I'm stuck with coding the Alpha Beta algorithm for a console-based game I'm developping at the moment. I tried to understand how it works for a week but still no idea how to get started with it.
Here ...
1
vote
2answers
320 views
Are SDL games trivially portable from Linux to Windows?
I have a small game made with SDL2 and I want to port it to Windows. Would I hav eto write a lot of #ifdefs to port it or will the very same code work on Windows and Linux? Or is it more complicated?
...
0
votes
2answers
264 views
What's the correct way to move 2d sprites in opengl 2.1?
I'm getting into Opengl 2.1 and wanted to know how can I move 2d sprites.
I already created my vbo and ibo, and the vertex data is already there. But, how can I move a sprite once it's already drawn?
...
1
vote
1answer
146 views
opengl : Running at least 25 windows with different Draw callback
I need to run at least 25 windows concurrently with each window rendering a different game state.
I am storing all the 25 game states in the array of type GameState allGameStates[25].
For each of the ...
2
votes
2answers
146 views
Rogue Door Connection logic
I'm having a bit of trouble developing code to figure out which doors connect in Rogue which is written in c. Not the actual path making. I just dont understand how they link to each other.
If rooms ...
3
votes
1answer
160 views
Where can I find OpenGL state changes profiling?
Is there any benchmark that actually measure state changes cost in OpenGL 3.x/4.x and gather an average statics for all graphics cards? (I don't want to optimize only for my old AMD card, I'm not even ...
0
votes
2answers
75 views
Overload how an object instance of a class is treated when used
So I've made this struct that encapsulates a glm::vec4. This is because vec3s are treated as 16-byte in GLSL, but I don't want to assign a vec4 if I only really need 3 components. Anyway, my question ...
1
vote
1answer
354 views
C++ Ray Traversing in 3D Voxel game
I'm currently working on a Voxel game in 3D and need a tad bit of help to figure out what Voxel the player is looking at. This is the data I currently have:
GRRLIB_Camera3dSettings(Player.x, Player.y,...
1
vote
3answers
94 views
c - Starting an user defined function after the current one ends
The game I am creating displays a menu before starting, the user may select to start the game, or do some stuff. When the user selects an option, I need to call another function which actually does ...
1
vote
1answer
59 views
How can I send matrix data to shaders without the Effects11 framework?
I'm making a Direct3D engine but I'm stuck with this one little problem.
I want to not use effect files but instead use shader files. What can I use to send matrix variables to shaders if I don't use ...
