@ -19,7 +19,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
if ( cmd_lists_count = = 0 )
return ;
// Setup render state: alpha-blending enabled, no face culling, no depth testing
// Setup render state: alpha-blending enabled, no face culling, no depth testing , scissor enabled, vertex/texcoord/color pointers.
glEnable ( GL_BLEND ) ;
glBlendFunc ( GL_SRC_ALPHA , GL_ONE_MINUS_SRC_ALPHA ) ;
glDisable ( GL_CULL_FACE ) ;
@ -29,11 +29,11 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
glEnableClientState ( GL_TEXTURE_COORD_ARRAY ) ;
glEnableClientState ( GL_COLOR_ARRAY ) ;
// Bind texture
// Setup texture
glBindTexture ( GL_TEXTURE_2D , fontTex ) ;
glEnable ( GL_TEXTURE_2D ) ;
// Setup matrices
// Setup orthographic projection matrix
const float width = ImGui : : GetIO ( ) . DisplaySize . x ;
const float height = ImGui : : GetIO ( ) . DisplaySize . y ;
glMatrixMode ( GL_PROJECTION ) ;
@ -73,24 +73,33 @@ static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
if ( ! text_end )
text_end = text + strlen ( text ) ;
if ( * text_end = = 0 )
{
// Already got a zero-terminator at 'text_end', we don't need to add one
glfwSetClipboardString ( window , text ) ;
}
else
{
// Add a zero-terminator because glfw function doesn't take a size
char * buf = ( char * ) malloc ( text_end - text + 1 ) ;
memcpy ( buf , text , text_end - text ) ;
buf [ text_end - text ] = ' \0 ' ;
glfwSetClipboardString ( window , buf ) ;
free ( buf ) ;
}
}
// GLFW callbacks to get events
static void glfw_error_callback ( int error , const char * description )
{
fputs ( description , stderr ) ;
}
static float mouse_wheel = 0.0f ;
static void glfw_scroll_callback ( GLFWwindow * window , double xoffset , double yoffset )
{
mouse_wheel = ( float ) yoffset ;
ImGuiIO & io = ImGui : : GetIO ( ) ;
io . MouseWheel = ( yoffset ! = 0.0f ) ? yoffset > 0.0f ? 1 : - 1 : 0 ; // Mouse wheel: -1,0,+1
}
static void glfw_key_callback ( GLFWwindow * window , int key , int scancode , int action , int mods )
@ -173,37 +182,43 @@ void InitImGui()
stbi_image_free ( tex_data ) ;
}
void Shutdown ( )
void UpdateImGui ( )
{
ImGui : : Shutdown ( ) ;
glfwTerminate ( ) ;
}
int main ( int argc , char * * argv )
{
InitGL ( ) ;
InitImGui ( ) ;
double time = glfwGetTime ( ) ;
while ( ! glfwWindowShouldClose ( window ) )
{
ImGuiIO & io = ImGui : : GetIO ( ) ;
glfwPollEvents ( ) ;
// 1) ImGui start frame, setup time delta & inputs
// Setup timestep
static double time = 0.0f ;
const double current_time = glfwGetTime ( ) ;
io . DeltaTime = ( float ) ( current_time - time ) ;
time = current_time ;
// Setup inputs
// (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
double mouse_x , mouse_y ;
glfwGetCursorPos ( window , & mouse_x , & mouse_y ) ;
io . MousePos = ImVec2 ( ( float ) mouse_x , ( float ) mouse_y ) ; // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
io . MouseDown [ 0 ] = glfwGetMouseButton ( window , GLFW_MOUSE_BUTTON_LEFT ) ! = 0 ;
io . MouseDown [ 1 ] = glfwGetMouseButton ( window , GLFW_MOUSE_BUTTON_RIGHT ) ! = 0 ;
io . MouseWheel = ( mouse_wheel ! = 0 ) ? mouse_wheel > 0.0f ? 1 : - 1 : 0 ; // Mouse wheel: -1,0,+1
mouse_wheel = 0.0f ;
// Start the frame
ImGui : : NewFrame ( ) ;
}
// Application code
int main ( int argc , char * * argv )
{
InitGL ( ) ;
InitImGui ( ) ;
// 2) ImGui usage
while ( ! glfwWindowShouldClose ( window ) )
{
ImGuiIO & io = ImGui : : GetIO ( ) ;
io . MouseWheel = 0 ;
glfwPollEvents ( ) ;
UpdateImGui ( ) ;
// Create a simple window
// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
static bool show_test_window = true ;
static bool show_another_window = false ;
static float f ;
@ -217,19 +232,21 @@ int main(int argc, char** argv)
static int ms_per_frame_idx = 0 ;
static float ms_per_frame_accum = 0.0f ;
ms_per_frame_accum - = ms_per_frame [ ms_per_frame_idx ] ;
ms_per_frame [ ms_per_frame_idx ] = io . DeltaTime * 1000.0f ;
ms_per_frame [ ms_per_frame_idx ] = ImGui: : GetIO ( ) . DeltaTime * 1000.0f ;
ms_per_frame_accum + = ms_per_frame [ ms_per_frame_idx ] ;
ms_per_frame_idx = ( ms_per_frame_idx + 1 ) % 120 ;
const float ms_per_frame_avg = ms_per_frame_accum / 120 ;
ImGui : : Text ( " Application average %.3f ms/frame (%.1f FPS) " , ms_per_frame_avg , 1000.0f / ms_per_frame_avg ) ;
// Show the ImGui test window
// Most of user example code is in ImGui::ShowTestWindow()
if ( show_test_window )
{
// More example code in ShowTestWindow()
ImGui : : SetNewWindowDefaultPos ( ImVec2 ( 650 , 20 ) ) ; // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
ImGui : : ShowTestWindow ( & show_test_window ) ;
}
// Show another simple window
if ( show_another_window )
{
ImGui : : Begin ( " Another Window " , & show_another_window , ImVec2 ( 200 , 100 ) ) ;
@ -237,15 +254,15 @@ int main(int argc, char** argv)
ImGui : : End ( ) ;
}
// 3) Rendering
// Rendering
glViewport ( 0 , 0 , ( int ) io . DisplaySize . x , ( int ) io . DisplaySize . y ) ;
glClearColor ( 0.8f , 0.6f , 0.6f , 1.0f ) ;
glClear ( GL_COLOR_BUFFER_BIT ) ;
ImGui : : Render ( ) ;
glfwSwapBuffers ( window ) ;
}
Shutdown ( ) ;
ImGui : : Shutdown ( ) ;
glfwTerminate ( ) ;
return 0 ;
}
ocornut
11 years ago