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Examples: DirectX10, DirectX11, OpenGL2, OpenGL3: Added support for io.DisplayPos.

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This commit is contained in:
omar
2018-02-18 21:09:28 +01:00
parent 45cbebad64
commit 3bd3693fb7
4 changed files with 73 additions and 27 deletions
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21
examples/imgui_impl_opengl2.cpp
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@ -6,6 +6,10 @@
// confuse your GPU driver.
// The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2018-XX-XX: Draw: Offset projection matrix and clipping rectangle by io.DisplayPos (which will be non-zero for multi-viewport applications).
#include "imgui.h"
#include "imgui_impl_opengl2.h"
@ -75,11 +79,12 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
// Setup viewport, orthographic projection matrix
// Our visible imgui space lies from io.DisplayPos (top left) to io.DisplayPos+io.DisplaySize (bottom right). io.DisplayPos is typically (0,0) for single viewport applications.
glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0f, io.DisplaySize.x, io.DisplaySize.y, 0.0f, -1.0f, +1.0f);
glOrtho(io.DisplayPos.x, io.DisplayPos.x + io.DisplaySize.x, io.DisplayPos.y + io.DisplaySize.y, io.DisplayPos.y, -1.0f, +1.0f);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
@ -99,13 +104,21 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
if (pcmd->UserCallback)
{
// User callback (registered via ImDrawList::AddCallback)
pcmd->UserCallback(cmd_list, pcmd);
}
else
{
glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer);
ImVec4 clip_rect = ImVec4(pcmd->ClipRect.x - io.DisplayPos.x, pcmd->ClipRect.y - io.DisplayPos.y, pcmd->ClipRect.z - io.DisplayPos.x, pcmd->ClipRect.w - io.DisplayPos.y);
if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
{
// Apply scissor/clipping rectangle
glScissor((int)clip_rect.x, (int)(fb_height - clip_rect.w), (int)(clip_rect.z - clip_rect.x), (int)(clip_rect.w - clip_rect.y));
// Bind texture, Draw
glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer);
}
}
idx_buffer += pcmd->ElemCount;
}