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Tidying up example applications

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features/sdl_renderer3_multiviewports
ocornut ago%!(EXTRA string=11 years)
parent 86d2c9d232
commit 4020ef7b58
2 changed files with 56 additions and 67 deletions
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  1. 55
      examples/directx9_example/main.cpp
  2. 68
      examples/opengl_example/main.cpp

55
examples/directx9_example/main.cpp
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@ -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();
}

68
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();
}
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;
}

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