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#include <ClanLib/core.h>
#include <ClanLib/application.h>
#include <ClanLib/display.h>
#include <ClanLib/gl.h>
int blend_table_src[] =
{
blend_zero, // source or destination (0, 0, 0, 0)
blend_one, // source or destination (1, 1, 1, 1)
blend_dest_color, // source (Rd, Gd, Bd, Ad)
blend_one_minus_dest_color, // source (1, 1, 1, 1) - (Rd, Gd, Bd, Ad)
blend_src_alpha, // source or destination (As, As, As, As)
blend_one_minus_src_alpha, // source or destination (1, 1, 1, 1) - (As, As, As, As)
blend_dst_alpha, // source or destination (Ad, Ad, Ad, Ad)
blend_one_minus_dest_alpha, // source or destination (1, 1, 1, 1) - (Ad, Ad, Ad, Ad)
blend_src_alpha_saturate, // source (f, f, f, 1) - f = min(As, 1 - Ad)
blend_constant_color, // source or destination (Rc, Gc, Bc, Ac)
blend_one_minus_constant_color, // source or destination (1, 1, 1, 1) - (Rc, Gc, Bc, Ac)
blend_constant_alpha, // source or destination (Ac, Ac, Ac, Ac)
blend_one_minus_constant_alpha // source or destination (1, 1, 1, 1) - (Ac, Ac, Ac, Ac)
-1
};
char *blend_strings_src[] =
{
"zero",
"one",
"dest_color",
"one_minus_dest_color",
"src_alpha",
"one_minus_src_alpha",
"dst_alpha",
"one_minus_dest_alpha",
"src_alpha_saturate",
"constant_color",
"one_minus_constant_color",
"constant_alpha",
"one_minus_constant_alpha",
0
};
int blend_table_dst[] =
{
blend_zero, // source or destination (0, 0, 0, 0)
blend_one, // source or destination (1, 1, 1, 1)
blend_src_color, // destination (Rs, Gs, Bs, As)
blend_one_minus_src_color, // destination (1, 1, 1, 1) - (Rs, Gs, Bs, As)
blend_src_alpha, // source or destination (As, As, As, As)
blend_one_minus_src_alpha, // source or destination (1, 1, 1, 1) - (As, As, As, As)
blend_dst_alpha, // source or destination (Ad, Ad, Ad, Ad)
blend_one_minus_dest_alpha, // source or destination (1, 1, 1, 1) - (Ad, Ad, Ad, Ad)
blend_constant_color, // source or destination (Rc, Gc, Bc, Ac)
blend_one_minus_constant_color, // source or destination (1, 1, 1, 1) - (Rc, Gc, Bc, Ac)
blend_constant_alpha, // source or destination (Ac, Ac, Ac, Ac)
blend_one_minus_constant_alpha // source or destination (1, 1, 1, 1) - (Ac, Ac, Ac, Ac)
-1
};
char *blend_strings_dst[] =
{
"zero",
"one",
"src_color",
"one_minus_src_color",
"src_alpha",
"one_minus_src_alpha",
"dst_alpha",
"one_minus_dest_alpha",
"constant_color",
"one_minus_constant_color",
"constant_alpha",
"one_minus_constant_alpha",
0
};
class ExampleBlendFunctions : public CL_ClanApplication
{
public:
int selected_src, selected_dst;
virtual int main(int argc, char **argv)
{
int index_src, index_dst;
// Create a console window for text-output if not available
CL_ConsoleWindow console("Console");
console.redirect_stdio();
quit = false;
try
{
// Initialize ClanLib base components
CL_SetupCore setup_core;
// Initialize the ClanLib display component
CL_SetupDisplay setup_display;
// Initilize the OpenGL drivers
CL_SetupGL setup_gl;
// Set a videomode - 640x480
CL_DisplayWindow window("ClanLib BlendFunctions Example", 1024, 768);
// Connect the Window close event
CL_Slot slot_quit = window.sig_window_close().connect(this, &ExampleBlendFunctions::on_window_close);
// Connect a keyboard handler to on_key_up()
CL_Slot slot_input_down = (window.get_ic()->get_keyboard()).sig_key_down().connect(this, &ExampleBlendFunctions::on_input_down);
// Load resources
CL_ResourceManager resources("resources.xml", false);
CL_Font font_text("font", &resources);
CL_Surface sur_logo("background", &resources);
selected_src = 0;
selected_dst = 0;
// Select blend_src_alpha per default (ClanLib default source blend)
for (index_src = 0; blend_strings_src[index_src] != 0; index_src++)
{
if (blend_table_src[index_src] == blend_src_alpha)
{
selected_src = index_src;
break;
}
}
// Select blend_one_minus_src_alpha per default (ClanLib default dest blend)
for (index_dst = 0; blend_strings_dst[index_dst] != 0; index_dst++)
{
if (blend_table_dst[index_dst] == blend_one_minus_src_alpha)
{
selected_dst = index_dst;
break;
}
}
CL_FramerateCounter frameratecounter;
// Run until someone presses escape
while (!quit)
{
// Clear the display
CL_Display::fill_rect(
CL_Rect(0,0,CL_Display::get_width(),CL_Display::get_height()),
CL_Gradient(
CL_Color::red,
CL_Color::chartreuse,
CL_Color::cornflowerblue,
CL_Color::darksalmon));
int yy = 20;
int xx = 203;
for (index_dst = 0; blend_strings_dst[index_dst] != 0; index_dst++)
{
if (xx + font_text.get_width(blend_strings_dst[index_dst]) > CL_Display::get_width())
{
yy += 20;
xx = 203;
}
if (selected_dst == index_dst)
{
CL_Display::fill_rect(
CL_Rect(
xx-2,
yy-2,
xx+font_text.get_width(blend_strings_dst[index_dst])+2,
yy+18),
CL_Color::blue);
}
font_text.draw(
xx, yy, blend_strings_dst[index_dst], window.get_gc());
xx += font_text.get_width(blend_strings_dst[index_dst])+10;
}
yy += 22;
font_text.set_alignment(origin_top_right);
font_text.draw(200, 3, "dest blend:");
font_text.set_alignment(origin_bottom_left);
font_text.draw(3, yy-2, "source blend:");
font_text.set_alignment(origin_top_left);
CL_Display::draw_line(0, yy, CL_Display::get_width(), yy, CL_Color::firebrick);
CL_Display::draw_line(200, 0, 200, CL_Display::get_height(), CL_Color::firebrick);
yy += 3;
int start_y = yy;
for (index_src = 0; blend_strings_src[index_src] != 0; index_src++)
{
if (selected_src == index_src)
{
CL_Display::fill_rect(
CL_Rect(
1,
yy-2,
3+font_text.get_width(blend_strings_src[index_src])+2,
yy+18),
CL_Color::blue);
}
font_text.draw(
3, yy, blend_strings_src[index_src], window.get_gc());
yy += 20;
}
sur_logo.set_blend_func(
(CL_BlendFunc) blend_table_src[selected_src],
(CL_BlendFunc) blend_table_dst[selected_dst]);
sur_logo.draw(203, start_y, window.get_gc());
int fps = frameratecounter.get_fps();
font_text.set_alignment(origin_bottom_right);
font_text.draw(198, start_y-5, CL_String::from_int(fps) + " fps");
font_text.set_alignment(origin_top_left);
// Flip the display, showing on the screen what we have drawed
// since last call to flip_display()
CL_Display::flip();
// This call updates input and performs other "housekeeping"
// call this each frame
CL_System::keep_alive();
}
}
catch(CL_Error error)
{
std::cout << "Exception caught : " << error.message.c_str() << std::endl;
// Display console close message and wait for a key
console.display_close_message();
return -1;
}
return 0;
}
private:
bool quit;
void on_input_down(const CL_InputEvent &key)
{
if(key.id == CL_KEY_ESCAPE)
quit = true;
if (key.id == CL_KEY_LEFT && selected_dst > 0)
selected_dst--;
if (key.id == CL_KEY_RIGHT && blend_table_dst[selected_dst+1] != -1)
selected_dst++;
if (key.id == CL_KEY_UP && selected_src > 0)
selected_src--;
if (key.id == CL_KEY_DOWN && blend_table_src[selected_src+1] != -1)
selected_src++;
}
void on_window_close()
{
quit = true;
}
} my_app;
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