anulax
/
imgui-docking
1
0
Fork 0
Code Issues Pull Requests Packages project_board Releases Wiki Activity

Tidying up example applications

Browse Source
features/sdl_renderer3_multiviewports
ocornut ago%!(EXTRA string=11 years)
parent 86d2c9d232
commit 4020ef7b58
2 changed files with 56 additions and 67 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 55
      examples/directx9_example/main.cpp
  2. 62
      examples/opengl_example/main.cpp

55
examples/directx9_example/main.cpp
Unescape View File

@ -12,16 +12,15 @@ static LPDIRECT3D9 g_pD3D = NULL; // Used to create the D3DDevice
static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; // Our rendering device
static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL; // Buffer to hold vertices
static LPDIRECT3DTEXTURE9 g_pTexture = NULL; // Our texture
struct CUSTOMVERTEX
{
D3DXVECTOR3 position;
D3DCOLOR color;
float tu, tv;
};
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structuer)
static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
{
size_t total_vtx_count = 0;
@ -30,31 +29,13 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
if (total_vtx_count == 0)
return;
ImVector<ImVec4> clip_rect_stack;
clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
// Setup orthographic projection
// Set up world matrix
D3DXMATRIXA16 mat;
D3DXMatrixIdentity(&mat);
g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat);
g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat);
D3DXMatrixOrthoOffCenterLH(&mat, 0.0f, ImGui::GetIO().DisplaySize.x, ImGui::GetIO().DisplaySize.y, 0.0f, -1.0f, +1.0f);
g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat);
D3DSURFACE_DESC texture_desc;
g_pTexture->GetLevelDesc(0, &texture_desc);
// Fill the vertex buffer
// Copy and convert all vertices into a single contiguous buffer
CUSTOMVERTEX* vtx_dst;
if (g_pVB->Lock(0, total_vtx_count, (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
return;
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
continue;
const ImDrawVert* vtx_src = &cmd_list->vtx_buffer[0];
for (size_t i = 0; i < cmd_list->vtx_buffer.size(); i++)
{
@ -73,11 +54,10 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof( CUSTOMVERTEX ) );
g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );
// Setup render state: alpha-blending enabled, no face culling, no depth testing
// Setup render state: alpha-blending, no face culling, no depth testing
g_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, false );
g_pd3dDevice->SetRenderState( D3DRS_ZENABLE, false );
g_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, true );
g_pd3dDevice->SetRenderState( D3DRS_BLENDOP, D3DBLENDOP_ADD );
g_pd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE, false );
@ -94,17 +74,29 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE );
g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE );
int vtx_consumed = 0; // offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
bool clip_rect_dirty = true;
// Setup orthographic projection matrix
D3DXMATRIXA16 mat;
D3DXMatrixIdentity(&mat);
g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat);
g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat);
D3DXMatrixOrthoOffCenterLH(&mat, 0.0f, ImGui::GetIO().DisplaySize.x, ImGui::GetIO().DisplaySize.y, 0.0f, -1.0f, +1.0f);
g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat);
// Render command lists
int vtx_consumed = 0; // offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
continue;
// Setup stack of clipping rectangles
bool clip_rect_dirty = true;
int clip_rect_buf_consumed = 0;
ImVector<ImVec4> clip_rect_stack;
clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
// Render command list
const ImDrawCmd* pcmd = &cmd_list->commands.front();
const ImDrawCmd* pcmd_end = &cmd_list->commands.back();
int clip_rect_buf_consumed = 0; // offset in cmd_list->clip_rect_buffer. each PushClipRect command consume 1 of those.
while (pcmd <= pcmd_end)
{
const ImDrawCmd& cmd = *pcmd++;
@ -290,7 +282,6 @@ void InitImGui()
io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
// Create the vertex buffer
if (g_pd3dDevice->CreateVertexBuffer(10000 * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
{
@ -396,13 +387,15 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
ImGui::End();
}
// 3) Render
// 3) Rendering
// Clear frame buffer
g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0); // Clear the backbuffer and the zbuffer
g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0);
if (g_pd3dDevice->BeginScene() >= 0)
{
// Render ImGui
ImGui::Render();
g_pd3dDevice->EndScene();
}

62
examples/opengl_example/main.cpp
Unescape View File

@ -18,6 +18,7 @@ static GLuint fontTex;
static GLint uniMVP;
static GLint uniClipRect;
// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structuer)
static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
{
size_t total_vtx_count = 0;
@ -26,24 +27,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
if (total_vtx_count == 0)
return;
int read_pos_clip_rect_buf = 0; // offset in 'clip_rect_buffer'. each PushClipRect command consume 1 of those.
ImVector<ImVec4> clip_rect_stack;
clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
// Setup orthographic projection
const float L = 0.0f;
const float R = ImGui::GetIO().DisplaySize.x;
const float B = ImGui::GetIO().DisplaySize.y;
const float T = 0.0f;
const float mvp[4][4] =
{
{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f },
{ 0.0f, 0.0f, -1.0f, 0.0f },
{ -(R+L)/(R-L), -(T+B)/(T-B), 0.0f, 1.0f },
};
// Copy all vertices into a single contiguous GL buffer
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBindVertexArray(vao);
glBufferData(GL_ARRAY_BUFFER, total_vtx_count * sizeof(ImDrawVert), NULL, GL_STREAM_DRAW);
@ -54,37 +38,51 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
if (!cmd_list->vtx_buffer.empty())
{
memcpy(buffer_data, &cmd_list->vtx_buffer[0], cmd_list->vtx_buffer.size() * sizeof(ImDrawVert));
buffer_data += cmd_list->vtx_buffer.size() * sizeof(ImDrawVert);
vtx_consumed += cmd_list->vtx_buffer.size();
}
}
glUnmapBuffer(GL_ARRAY_BUFFER);
glUseProgram(shaderProgram);
glUniformMatrix4fv(uniMVP, 1, GL_FALSE, &mvp[0][0]);
// Setup render state: alpha-blending enabled, no face culling, no depth testing
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
// Bind texture and enable our shader
glBindTexture(GL_TEXTURE_2D, fontTex);
glUseProgram(shaderProgram);
vtx_consumed = 0; // offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
bool clip_rect_dirty = true;
// Setup orthographic projection matrix
const float L = 0.0f;
const float R = ImGui::GetIO().DisplaySize.x;
const float B = ImGui::GetIO().DisplaySize.y;
const float T = 0.0f;
const float mvp[4][4] =
{
{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f },
{ 0.0f, 0.0f, -1.0f, 0.0f },
{ -(R+L)/(R-L), -(T+B)/(T-B), 0.0f, 1.0f },
};
glUniformMatrix4fv(uniMVP, 1, GL_FALSE, &mvp[0][0]);
// Render command lists
vtx_consumed = 0; // offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
continue;
// Setup stack of clipping rectangles
bool clip_rect_dirty = true;
int clip_rect_buf_consumed = 0;
ImVector<ImVec4> clip_rect_stack;
clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
// Render command list
const ImDrawCmd* pcmd = &cmd_list->commands.front();
const ImDrawCmd* pcmd_end = &cmd_list->commands.back();
int clip_rect_buf_consumed = 0; // offset in cmd_list->clip_rect_buffer. each PushClipRect command consume 1 of those.
while (pcmd <= pcmd_end)
{
const ImDrawCmd& cmd = *pcmd++;
@ -132,7 +130,6 @@ static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
}
// Shader sources
// FIXME-OPT: clip at vertex level
const GLchar* vertexSource =
"#version 150 core\n"
"uniform mat4 MVP;"
@ -164,6 +161,7 @@ const GLchar* fragmentSource =
" 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
"}";
// GLFW callbacks to get events
static void glfw_error_callback(int error, const char* description)
{
fputs(description, stderr);
@ -251,7 +249,6 @@ void InitImGui()
io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
// Setup graphics backend
GLint status = GL_TRUE;
GLenum err = GL_NO_ERROR;
@ -394,7 +391,7 @@ int main(int argc, char** argv)
ImGui::End();
}
// 3) Render
// 3) Rendering
glClearColor(0.8f, 0.6f, 0.6f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
ImGui::Render();
@ -403,6 +400,5 @@ int main(int argc, char** argv)
}
Shutdown();
return 0;
}

Write Preview
Loading…
Cancel
Save