Messages

1

Graphics / Re: Shader performance

« on: December 08, 2013, 06:11:18 pm »

http://pastebin.com/9trE982C <- here is my code

The code of the shader:

uniform sampler2D texture;

const vec4 res1 = vec4(1.0, 1.0, 0.3, 1.0);
const vec4 res2 = vec4(0.0, 0.0, 0.66666, 1.0);

void main()
{
    vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
    gl_FragColor = pixel.a * res1 + (1.0 - pixel.a) * res2;
}
 

The shader examples are running smooth, maybe the old and slow VGA is the problem.

2

Graphics / Re: Shader performance

« on: December 02, 2013, 12:58:45 am »

But could it be a shader problem? On the other hand, I haven't tried yet, what happens if I use vbos, because I just couldn't drop GLEW into the project. ><

EDIT: I modified the shader not to use branching, only got +1 FPS.

3

Graphics / Re: Shader performance

« on: November 30, 2013, 06:24:46 pm »

I packing the vec3 into a vec4, because I had some uniforms to modify the color of the fonts. But I commented them out, and deleted from the source. On the other hand, I'm checking if the texture is transparent(255,0,255 color), and I set that pixel to the background color (now vec3(0.0, 0.0, 0.66666)), then set the other pixels color to the other color.

4

Graphics / Shader performance

« on: November 30, 2013, 06:03:38 pm »

Hello!

I have an interesting problem, maybe it's just my old video card. I'm trying to create a custom font renderer (using sf::Sprite with shaders). The problem is that if I draw 3700 sprite without shaders, it runs at 300-400 FPS, but if I turn on the very basic shaders the FPS drops to 9. The vertex shader does nothing, but on the fragment, I just do some simple calculation.

uniform sampler2D texture;

void main()
{
    vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
    if(pixel == vec4(1.0, 0.0, 1.0, 1.0))
    {
        pixel = vec4(vec3(0.0, 0.0, 0.66666), 1.0);
    }
    else
    {
        pixel = vec4(vec3(1.0, 1.0, 0.3), 1.0);
    }
    gl_FragColor = pixel;
}

Any idea? I thought about the lot of texture swap, but then it won't run with 300 - 400 fps without shaders.