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Backends: OpenGL3: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex attribute states. (amends)
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@ -14,7 +14,7 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2022-05-05: OpenGL: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex attribute states.
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// 2022-05-13: OpenGL: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex attribute states.
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// 2021-12-15: OpenGL: Using buffer orphaning + glBufferSubData(), seems to fix leaks with multi-viewports with some Intel HD drivers.
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// 2021-08-23: OpenGL: Fixed ES 3.0 shader ("#version 300 es") use normal precision floats to avoid wobbly rendering at HD resolutions.
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// 2021-08-19: OpenGL: Embed and use our own minimal GL loader (imgui_impl_opengl3_loader.h), removing requirement and support for third-party loader.
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@ -204,33 +204,28 @@ static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData()
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return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
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}
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// OpenGL vertex attribute state
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// OpenGL vertex attribute state (for ES 1.0 and ES 2.0 only)
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#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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struct ImGui_ImplOpenGL3_VtxAttribState
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{
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GLint Enabled;
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GLint Size;
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GLint Type;
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GLint Normalized;
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GLint Stride;
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GLint Enabled, Size, Type, Normalized, Stride;
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GLvoid* Ptr;
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void GetState(GLint index)
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{
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &Enabled);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_SIZE, &Size);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_TYPE, &Type);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, &Normalized);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_STRIDE, &Stride);
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glGetVertexAttribPointerv(index, GL_VERTEX_ATTRIB_ARRAY_POINTER, &Ptr);
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}
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void SetState(GLint index)
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{
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glVertexAttribPointer(index, Size, Type, (GLboolean)Normalized, Stride, Ptr);
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if (Enabled) glEnableVertexAttribArray(index); else glDisableVertexAttribArray(index);
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}
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};
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static void ImGui_ImplOpenGL3_BackupVertexAttribState(GLint index, ImGui_ImplOpenGL3_VtxAttribState* state)
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{
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &state->Enabled);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_SIZE, &state->Size);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_TYPE, &state->Type);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, &state->Normalized);
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glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_STRIDE, &state->Stride);
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glGetVertexAttribPointerv(index, GL_VERTEX_ATTRIB_ARRAY_POINTER, &state->Ptr);
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}
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static void ImGui_ImplOpenGL3_RestoreVertexAttribState(GLint index, ImGui_ImplOpenGL3_VtxAttribState* state)
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{
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glVertexAttribPointer(index, state->Size, state->Type, state->Normalized, state->Stride, state->Ptr);
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if (state->Enabled) glEnableVertexAttribArray(index); else glDisableVertexAttribArray(index);
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}
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#endif
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// Functions
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@ -430,14 +425,12 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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GLuint last_sampler; if (bd->GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
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#endif
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GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer);
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// This is part of VAO on OpenGL 3.0+ and OpenGL ES 3.0+.
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#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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// This is part of VAO on OpenGL 3.0+ and OpenGL ES 3.0+.
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GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer);
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ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_pos, last_vtx_attrib_state_uv, last_vtx_attrib_state_color;
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ImGui_ImplOpenGL3_BackupVertexAttribState(bd->AttribLocationVtxPos, &last_vtx_attrib_state_pos);
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ImGui_ImplOpenGL3_BackupVertexAttribState(bd->AttribLocationVtxUV, &last_vtx_attrib_state_uv);
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ImGui_ImplOpenGL3_BackupVertexAttribState(bd->AttribLocationVtxColor, &last_vtx_attrib_state_color);
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ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_pos; last_vtx_attrib_state_pos.GetState(bd->AttribLocationVtxPos);
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ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_uv; last_vtx_attrib_state_uv.GetState(bd->AttribLocationVtxUV);
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ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_color; last_vtx_attrib_state_color.GetState(bd->AttribLocationVtxColor);
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#endif
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object);
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@ -550,9 +543,9 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
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#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
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ImGui_ImplOpenGL3_RestoreVertexAttribState(bd->AttribLocationVtxPos, &last_vtx_attrib_state_pos);
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ImGui_ImplOpenGL3_RestoreVertexAttribState(bd->AttribLocationVtxUV, &last_vtx_attrib_state_uv);
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ImGui_ImplOpenGL3_RestoreVertexAttribState(bd->AttribLocationVtxColor, &last_vtx_attrib_state_color);
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last_vtx_attrib_state_pos.SetState(bd->AttribLocationVtxPos);
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last_vtx_attrib_state_uv.SetState(bd->AttribLocationVtxUV);
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last_vtx_attrib_state_color.SetState(bd->AttribLocationVtxColor);
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#endif
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glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
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glBlendFuncSeparate(last_blend_src_rgb, last_blend_dst_rgb, last_blend_src_alpha, last_blend_dst_alpha);
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@ -113,6 +113,8 @@ Other Changes:
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- Backends: OSX: Monitor NSKeyUp events to catch missing keyUp for key when user press Cmd + key (#5128) [@thedmd]
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- Backends: OSX, Metal: Store backend data in a per-context struct, allowing to use these backends with
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multiple contexts. (#5203, #5221, #4141) [@noisewuwei]
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- Backends: OpenGL3: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING
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and vertex attribute states. [@rokups]
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- Examples: Emscripten+WebGPU: Fix building for latest WebGPU specs. (#3632)
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- Examples: OSX+Metal, OSX+OpenGL: Removed now-unnecessary calls to ImGui_ImplOSX_HandleEvent(). (#4821)
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@ -249,8 +251,6 @@ Other Changes:
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- Backends: OpenGL3: Fixed a buffer overflow in imgui_impl_opengl3_loader.h init (added in 1.86). (#4468, #4830) [@dymk]
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It would generally not have noticeable side-effect at runtime but would be detected by runtime checkers.
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- Backends: OpenGL3: Fix OpenGL ES2 includes on Apple systems. [@rokups]
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- Backends: OpenGL3: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex
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attribute states. [@rokups]
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- Backends: Metal: Added Apple Metal C++ API support. (#4824, #4746) [@luigifcruz]
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Enable with '#define IMGUI_IMPL_METAL_CPP' in your imconfig.h file.
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- Backends: Metal: Ignore ImDrawCmd where ElemCount == 0, which are normally not emitted by the library but
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