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Examples: OpenGL2/3: save/restore some more state correctly.

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Might save an hour of staring at blank-screen to 5% of the population,
worth it.
This commit is contained in:
ocornut
2015-08-29 17:44:52 +01:00
parent f2c68109a6
commit 0bb46c824e
3 changed files with 33 additions and 15 deletions
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7
examples/opengl_example/imgui_impl_glfw.cpp
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@ -28,6 +28,8 @@ static void ImGui_ImplGlfw_RenderDrawLists(ImDrawData* draw_data)
// We are using the OpenGL fixed pipeline to make the example code simpler to read!
// A probable faster way to render would be to collate all vertices from all cmd_lists into a single vertex buffer.
// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers.
GLint last_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -87,7 +89,7 @@ static void ImGui_ImplGlfw_RenderDrawLists(ImDrawData* draw_data)
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glBindTexture(GL_TEXTURE_2D, 0);
glBindTexture(GL_TEXTURE_2D, last_texture);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
@ -147,6 +149,8 @@ bool ImGui_ImplGlfw_CreateDeviceObjects()
io.Fonts->GetTexDataAsAlpha8(&pixels, &width, &height);
// Create texture
GLint last_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
glGenTextures(1, &g_FontTexture);
glBindTexture(GL_TEXTURE_2D, g_FontTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@ -159,6 +163,7 @@ bool ImGui_ImplGlfw_CreateDeviceObjects()
// Cleanup (don't clear the input data if you want to append new fonts later)
io.Fonts->ClearInputData();
io.Fonts->ClearTexData();
glBindTexture(GL_TEXTURE_2D, last_texture);
return true;
}