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C / [SOLVED] error: invalid use of undefined type 'struct sfTexture'

« on: October 02, 2016, 04:37:50 am »

Hi! I just picked up C and CSFML and I'm having some issues loading textures. My compiler is telling me that sfTexture is an incomplete type. The error in question:

Code: [Select]

||=== Build: Release in Crucis (compiler: GNU GCC Compiler) ===|
C:\Users\Platino\Documents\C\Crucis\src\window.c||In function 'loadTextures':|
C:\Users\Platino\Documents\C\Crucis\src\window.c|113|error: invalid use of undefined type 'struct sfTexture'|
C:\Users\Platino\Documents\C\Crucis\src\window.c|113|error: dereferencing pointer to incomplete type|
C:\Users\Platino\Documents\C\Crucis\src\window.c|114|error: invalid use of undefined type 'struct sfTexture'|
C:\Users\Platino\Documents\C\Crucis\src\window.c|114|error: dereferencing pointer to incomplete type|
||=== Build failed: 4 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

From what I understand, there is a declaration but no implementation of sfTexture? I'm confused as to why this is an issue. I've been using sfRenderWindow, sfRectangleShape and sfVertexArray from the same header with no problems. Am I doing something wrong? Here is the simplified code from window.c:

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sfTexture* textures;
int texturenum = 2;

void loadTexture(void)
{
textures = malloc(sizeof(sfTexture*) * texturenum);
memset(textures, 0, sizeof(sfTexture*) * texturenum);

const char* filepath = "../img/tiles.png";
textures[0] = sfTexture_createFromFile(filepath, NULL); // Line 113

if(textures[0] == NULL) // Line 114
ERROR("Failed to load texture: ", filepath);
}
There's a lot going on with loading filenames from JSON and such, but I've triple-checked that's working correctly. Have I not correctly installed CSFML?

2

Graphics / [SOLVED] Loading a shader: pre-mature EOF parse error

« on: July 12, 2016, 02:53:55 am »

For my game project, I have a fog of war shader that hides out-of-view enemies:

Code: [Select]

uniform sampler2D objtexture;
uniform sampler2D fogtexture;
uniform sampler2D lighttexture;

void main()
{
    // Load textures into pixels
    vec4 objpixel = texture2D(objtexture, gl_TexCoord[0].xy);
    vec4 fogpixel = texture2D(fogtexture, gl_TexCoord[0].xy);
    vec4 lightpixel = texture2D(lighttexture, gl_TexCoord[0].xy);
   
    // Draw objects if a lighttexture pixel is fully-transparent
    // Otherwise, hide objects behind fog
    bool changealpha = bool(ceil(lightpixel.a));
    objpixel = vec4((lightpixel.rgb) * float(changealpha) + objpixel.rgb * float(!changealpha), lightpixel.a * float(changealpha) + objpixel.a * float(!changealpha));
    objpixel = mix(objpixel, fogpixel, fogpixel.a);
   
    gl_FragColor = objpixel;
}
When running the program from Code::Blocks, everything works fine. Running the executable, it isn't finding fog.frag file. I could include the fog.frag in the download, but I'd rather not have users cheat and edit the shader. As a solution, I tried embedding the shader in my program like the example shown here.

After running it through a Notepad++ macro to eliminate any human error, my shader now looks like this:

Code: [Select]

const std::string shaderdata = "uniform sampler2D objtexture;" \
"uniform sampler2D fogtexture;" \
"uniform sampler2D lighttexture;" \
"" \
"void main()" \
"{" \
"    // Load textures into pixels" \
"    vec4 objpixel = texture2D(objtexture, gl_TexCoord[0].xy);" \
"    vec4 fogpixel = texture2D(fogtexture, gl_TexCoord[0].xy);" \
"    vec4 lightpixel = texture2D(lighttexture, gl_TexCoord[0].xy);" \
"    " \
"    // Draw objects if a lighttexture pixel is fully-transparent" \
"    // Otherwise, hide objects behind fog" \
"    bool changealpha = bool(ceil(lightpixel.a));" \
"    objpixel = vec4((lightpixel.rgb) * float(changealpha) + objpixel.rgb * float(!changealpha), lightpixel.a * float(changealpha) + objpixel.a * float(!changealpha));" \
"    objpixel = mix(objpixel, fogpixel, fogpixel.a);" \
"    " \
"    gl_FragColor = objpixel;" \
"}";
Unfortunately, if I compile, I get this error:

Code: [Select]

Failed to compile fragment shader:
Fragment shader failed to compile with the following errors:
ERROR: 0:1: error(#131) Syntax error: pre-mature EOF parse error
ERROR: error(#273) 1 compilation errors.  No code generated
If I print out my shaderdata string, it looks just fine. If I remove all of the comments, line breaks and empty lines, I get the same exact error. Looking at the special characters in Notepad++, all I see are line breaks, tabs and spaces. Could someone please explain what I'm doing wrong?

3

Graphics / [SOLVED] Incorrect scaling of custom VertexArray

« on: June 30, 2016, 01:05:20 am »

Hello! I'm having some problems with the scaling of a custom VertexArray.

In my engine I have a texture for tiles, objects and lights. Tiles and objects are drawn via a custom VertexArray like the one shown here. Lights are drawn using sf::Shape. I draw the objects, tiles and lights to their textures, then I pass everything through a shader. The result is a fog of war system that masks out of view objects:



If I resize the window all of my textures resize accordingly and I can see a further distance:



Here's my problem: I don't want to draw my tile VertexArray to a texture then pass it through my shader. It seems wasteful because I'm not modifying it in my shader. Instead, I want to draw my tile VertexArray directly to the screen then draw the shader's texture over that. If I do this, it works just fine (like in the first image). The problem is when I resize the window. This happens:



Everything passed through the shader resizes correctly, but the tile VertexArray does not. The larger I resize the window, the further offscreen the tile VertexArray stretches. The smaller I make the window, the less the VertexArray takes up the screen.

If I debug my VertexArray, everything seems to be fine. Each vertex is still 32x32 in size and the larger the screen is, the more vertexes are added. I think SFML might be forcibly scaling my tile VertexArray which I do not want!

For the record, I have also tried rendering my tile VertexArray to a texture, making a sprite from that and rendering it to the window. I get the same bad results.