static void
_v_hi_set_gl_state(WaveformActor* actor)
{
AGl* agl = agl_get_instance();
const WaveformContext* wfc = actor->canvas;
#if defined (MULTILINE_SHADER)
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if(wfc->use_1d_textures){
glDisable(GL_TEXTURE_1D);
_c->shaders.lines->uniform.colour = actor->fg_colour;
_c->shaders.lines->uniform.n_channels = w->n_channels;
}
#elif defined(ANTIALIASED_LINES)
if(wfc->use_1d_textures){
agl->shaders.text->uniform.fg_colour = actor->fg_colour;
agl_use_material(agl->aaline);
agl_enable(AGL_ENABLE_BLEND | AGL_ENABLE_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, aaline_class.texture);
}else{
agl_enable(AGL_ENABLE_BLEND | AGL_ENABLE_TEXTURE_2D);
}
#else
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if(wfc->use_1d_textures){
glDisable(GL_TEXTURE_1D);
agl->shaders.plain->uniform.colour = actor->fg_colour;
agl_use_program((AGlShader*)agl->shaders.plain);
}
glDisable(GL_TEXTURE_2D);
#endif
}
void create_background(AGlActor* a)
{
//create an alpha-map gradient texture
AGlTextureActor* ta = (AGlTextureActor*)a;
if(ta->texture[0]) return;
int width = 256;
int height = 256;
char* pbuf = g_new0(char, width * height);
#if 1
int y; for(y=0;y<height;y++){
int x; for(x=0;x<width;x++){
*(pbuf + y * width + x) = ((x+y) * 0xff) / (width * 2);
}
}
#else
// this gradient is brighter in the middle. It only works for stereo.
int nc = 2;
int c; for(c=0;c<nc;c++){
int top = (height / nc) * c;
int bot = height / nc;
int mid = height / (2 * nc);
int y; for(y=0;y<mid;y++){
int x; for(x=0;x<width;x++){
int y_ = top + y;
int val = 0xff * (1.0 + sinf(((float)(-mid + 2 * y)) / mid));
*(pbuf + y_ * width + x) = ((val) / 8 + ((x+y_) * 0xff) / (width * 2)) / 2;
y_ = top + bot - y - 1;
*(pbuf + (y_) * width + x) = ((val) / 8 + ((x+y_) * 0xff) / (width * 2)) / 2;
}
}
}
#endif
agl_enable(AGL_ENABLE_TEXTURE_2D | AGL_ENABLE_BLEND);
glGenTextures(1, ta->texture);
if(glGetError() != GL_NO_ERROR){ gerr ("couldnt create bg_texture."); goto out; }
agl_load_alphamap(pbuf, ta->texture[0], width, height);
out:
g_free(pbuf);
}
