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Examples: OpenGL: fix for retina screens + io.DisplayFramebufferScale storage (#287)

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This commit is contained in:
ocornut
2015-08-27 19:51:02 +01:00
parent a36001212f
commit e58f99179a
6 changed files with 31 additions and 22 deletions
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24
examples/opengl3_example/imgui_impl_glfw_gl3.cpp
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@ -42,15 +42,18 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
glEnable(GL_SCISSOR_TEST);
glActiveTexture(GL_TEXTURE0);
// Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays)
ImGuiIO& io = ImGui::GetIO();
float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y;
draw_data->ScaleClipRects(io.DisplayFramebufferScale);
// Setup orthographic projection matrix
const float width = ImGui::GetIO().DisplaySize.x;
const float height = ImGui::GetIO().DisplaySize.y;
const float ortho_projection[4][4] =
{
{ 2.0f/width, 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/-height, 0.0f, 0.0f },
{ 0.0f, 0.0f, -1.0f, 0.0f },
{ -1.0f, 1.0f, 0.0f, 1.0f },
{ 2.0f/io.DisplaySize.x, 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/-io.DisplaySize.y, 0.0f, 0.0f },
{ 0.0f, 0.0f, -1.0f, 0.0f },
{-1.0f, 1.0f, 0.0f, 1.0f },
};
glUseProgram(g_ShaderHandle);
glUniform1i(g_AttribLocationTex, 0);
@ -77,7 +80,7 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
else
{
glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
glScissor((int)pcmd->ClipRect.x, (int)(height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
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, GL_UNSIGNED_SHORT, idx_buffer_offset);
}
idx_buffer_offset += pcmd->ElemCount;
@ -307,7 +310,8 @@ void ImGui_ImplGlfwGL3_NewFrame()
int display_w, display_h;
glfwGetWindowSize(g_Window, &w, &h);
glfwGetFramebufferSize(g_Window, &display_w, &display_h);
io.DisplaySize = ImVec2((float)display_w, (float)display_h);
io.DisplaySize = ImVec2((float)w, (float)h);
io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
// Setup time step
double current_time = glfwGetTime();
@ -320,9 +324,7 @@ void ImGui_ImplGlfwGL3_NewFrame()
{
double mouse_x, mouse_y;
glfwGetCursorPos(g_Window, &mouse_x, &mouse_y);
mouse_x *= (float)display_w / w; // Convert mouse coordinates to pixels
mouse_y *= (float)display_h / h;
io.MousePos = ImVec2((float)mouse_x, (float)mouse_y); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
io.MousePos = ImVec2((float)mouse_x, (float)mouse_y); // Mouse position in screen coordinates (set to -1,-1 if no mouse / on another screen, etc.)
}
else
{

5
examples/opengl3_example/main.cpp
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@ -53,7 +53,6 @@ int main(int, char**)
// Main loop
while (!glfwWindowShouldClose(window))
{
ImGuiIO& io = ImGui::GetIO();
glfwPollEvents();
ImGui_ImplGlfwGL3_NewFrame();
@ -86,7 +85,9 @@ int main(int, char**)
}
// Rendering
glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
int display_w, display_h;
glfwGetFramebufferSize(window, &display_w, &display_h);
glViewport(0, 0, display_w, display_h);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
ImGui::Render();