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Tidying up example applications so it looks easier to just grab code

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This commit is contained in:
ocornut
2014-08-14 00:01:41 +01:00
parent 29863b55ef
commit 46eee0cee4
2 changed files with 151 additions and 115 deletions
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85
examples/opengl_example/main.cpp
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@ -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);
// 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);
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();
ImGuiIO& io = ImGui::GetIO();
// 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;
// Start the frame
ImGui::NewFrame();
}
// Application code
int main(int argc, char** argv)
{
InitGL();
InitImGui();
double time = glfwGetTime();
while (!glfwWindowShouldClose(window))
{
ImGuiIO& io = ImGui::GetIO();
io.MouseWheel = 0;
glfwPollEvents();
UpdateImGui();
// 1) ImGui start frame, setup time delta & inputs
const double current_time = glfwGetTime();
io.DeltaTime = (float)(current_time - time);
time = current_time;
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;
ImGui::NewFrame();
// 2) ImGui usage
// 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;
}