Function blendbox

source/src/rendergl.cpp:303–391

}

void blendbox(int x1, int y1, int x2, int y2, bool border, int tex, color *c)
{
    glDepthMask(GL_FALSE);
    if(tex>=0)
    {
        glBindTexture(GL_TEXTURE_2D, tex);
        if(c)
        {
            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
            glColor4f(c->r, c->g, c->b, c->alpha);
        }
        else
        {
            glDisable(GL_BLEND);
            glColor3f(1, 1, 1);
        }

        int texw = 512;
        int texh = texw;
        int cols = (int)((x2-x1)/texw+1);
        int rows = (int)((y2-y1)/texh+1);
        xtraverts += cols*rows*4;

        loopj(rows)
        {
            float ytexcut = 0.0f;
            float yboxcut = 0.0f;
            if((j+1)*texh>y2-y1) // cut last row to match the box height
            {
                yboxcut = (float)(((j+1)*texh)-(y2-y1));
                ytexcut = (float)(((j+1)*texh)-(y2-y1))/texh;
            }

            loopi(cols)
            {
                float xtexcut = 0.0f;
                float xboxcut = 0.0f;
                if((i+1)*texw>x2-x1)
                {
                    xboxcut = (float)(((i+1)*texw)-(x2-x1));
                    xtexcut = (float)(((i+1)*texw)-(x2-x1))/texw;
                }

                glBegin(GL_TRIANGLE_STRIP);
                glTexCoord2f(0, 0);                 glVertex2f((float)x1+texw*i, (float)y1+texh*j);
                glTexCoord2f(1-xtexcut, 0);         glVertex2f(x1+texw*(i+1)-xboxcut, (float)y1+texh*j);
                glTexCoord2f(0, 1-ytexcut);         glVertex2f((float)x1+texw*i, y1+texh*(j+1)-yboxcut);
                glTexCoord2f(1-xtexcut, 1-ytexcut); glVertex2f(x1+texw*(i+1)-xboxcut, (float)y1+texh*(j+1)-yboxcut);
                glEnd();
            }
        }

        if(!c) glEnable(GL_BLEND);
    }
    else
    {
        glDisable(GL_TEXTURE_2D);