organicmaps/imgui
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Merge d7b8d9f6d8 into 150ad95bd6

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Dan O'Shea 2014-08-12 00:58:10 +00:00
commit 096791d502
3 changed files with 44 additions and 8 deletions
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12
README.md
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@ -11,6 +11,18 @@ After ImGui is setup in your application, you can use it like in this example:
ImGui outputs vertex buffers and simple command-lists that you can render in your application. Because it doesn't know or touch graphics state directly, you can call ImGui commands anywhere in your code (e.g. in the middle of a running algorithm, or in the middle of your own rendering process). Refer to the sample applications in the examples/ folder for instructions on how to integrate ImGui with your existing codebase.
Building on Mac OS
------------------
Omar Cornut @ocornut wrote this, I (@djoshea) simply added a Makefile and made minor tweaks to build and run successfully on MacOS Mavericks.
You will need to edit paths there once the versions in Homebrew change.
```
brew install glew
brew install glfw3
cd examples/opengl_example/
make
```
Gallery
-------

17
examples/opengl_example/Makefile Normal file
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@ -0,0 +1,17 @@
# This makefile currently only works for mac os
# You should install via homebrew:
# brew install glew
# brew install glfw3
#
CXXFLAGS=-framework OpenGL -framework Cocoa -framework IOKit
#CXXFLAGS+=-L/usr/local/Cellar/glew/1.10.0/lib -L/usr/local/Cellar/glfw3/3.0.4/lib
CXXFLAGS+=-lglew -lglfw3
CXXFLAGS+=-I../../
CXXFLAGS+= -D__APPLE__
main: main.cpp ../../imgui.cpp
$(CXX) $(CXXFLAGS) -o $@ $^
clean:
rm main

23
examples/opengl_example/main.cpp
View file

@ -8,6 +8,10 @@
#pragma warning (disable: 4996) // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
#endif
#ifdef __APPLE__
#define nullptr NULL
#endif
static GLFWwindow* window;
static GLuint vbo;
static GLuint vao;
@ -39,7 +43,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
buffer_data += cmd_list->vtx_buffer.size() * sizeof(ImDrawVert);
}
glUnmapBuffer(GL_ARRAY_BUFFER);
// Setup render state: alpha-blending enabled, no face culling, no depth testing
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -55,7 +59,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
// Setup orthographic projection matrix
const float width = ImGui::GetIO().DisplaySize.x;
const float height = ImGui::GetIO().DisplaySize.y;
const float mvp[4][4] =
const float mvp[4][4] =
{
{ 2.0f/width, 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/-height, 0.0f, 0.0f },
@ -149,7 +153,7 @@ const GLchar* fragmentSource =
"out vec4 o_col;"
"void main() {"
" o_col = texture(Tex, uv) * col;"
//" if (pixel_pos.x < ClipRect.x || pixel_pos.y < ClipRect.y || pixel_pos.x > ClipRect.z || pixel_pos.y > ClipRect.w) discard;" // Clipping: using discard
//" if (pixel_pos.x < ClipRect.x || pixel_pos.y < ClipRect.y || pixel_pos.x > ClipRect.z || pixel_pos.y > ClipRect.w) discard;" // Clipping: using discard
//" if (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w) < 1.0f) discard;" // Clipping: using discard and step
" o_col.w *= (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w));" // Clipping: branch-less, set alpha 0.0f
"}";
@ -191,10 +195,12 @@ void InitGL()
if (!glfwInit())
exit(1);
//glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
//glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#ifdef __APPLE__
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
glfwWindowHint(GLFW_REFRESH_RATE, 60);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
window = glfwCreateWindow(1280, 720, "ImGui OpenGL example", nullptr, nullptr);
@ -208,7 +214,8 @@ void InitGL()
glewInit();
GLenum err = GL_NO_ERROR;
err = glGetError(); IM_ASSERT(err == GL_NO_ERROR);
err = glGetError();
//IM_ASSERT(err == GL_NO_ERROR);
}
void InitImGui()