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ImDrawCallback_ResetRenderState, Examples: Added support for reset render state callback. (#2037, #1639, #2452)
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@ -72,24 +72,9 @@ void ImGui_ImplOpenGL2_NewFrame()
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ImGui_ImplOpenGL2_CreateDeviceObjects();
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}
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// OpenGL2 Render function.
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// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
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// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so.
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void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
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static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height)
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{
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// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
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int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
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int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
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if (fb_width == 0 || fb_height == 0)
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return;
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// We are using the OpenGL fixed pipeline to make the example code simpler to read!
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// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
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GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
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GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
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GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
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GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
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glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glDisable(GL_CULL_FACE);
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@ -121,6 +106,28 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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}
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// OpenGL2 Render function.
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// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
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// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so.
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void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
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{
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// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
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int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
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int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
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if (fb_width == 0 || fb_height == 0)
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return;
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// Backup GL state
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GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
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GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
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GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
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GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
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glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
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// Setup desired GL state
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ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
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// Will project scissor/clipping rectangles into framebuffer space
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ImVec2 clip_off = draw_data->DisplayPos; // (0,0) unless using multi-viewports
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@ -141,8 +148,12 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
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const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
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if (pcmd->UserCallback)
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{
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// User callback (registered via ImDrawList::AddCallback)
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pcmd->UserCallback(cmd_list, pcmd);
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// User callback, registered via ImDrawList::AddCallback()
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// (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
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if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
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ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
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else
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pcmd->UserCallback(cmd_list, pcmd);
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}
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else
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{
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@ -167,7 +178,7 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
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}
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}
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// Restore modified state
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// Restore modified GL state
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glDisableClientState(GL_COLOR_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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glDisableClientState(GL_VERTEX_ARRAY);
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