HostDisplay: Fudge texture coordinates for better linear filtering

src/duckstation-qt/d3d11displaywindow.cpp

@@ -418,8 +418,8 @@ void D3D11DisplayWindow::renderDisplay()
     0, 1, m_display_linear_filtering ? m_linear_sampler.GetAddressOf() : m_point_sampler.GetAddressOf());
 
   const float uniforms[4] = {
-    static_cast<float>(m_display_texture_view_x) / static_cast<float>(m_display_texture_width),
-    static_cast<float>(m_display_texture_view_y) / static_cast<float>(m_display_texture_height),
+    (static_cast<float>(m_display_texture_view_x) + 0.25f) / static_cast<float>(m_display_texture_width),
+    (static_cast<float>(m_display_texture_view_y) + 0.25f) / static_cast<float>(m_display_texture_height),
     (static_cast<float>(m_display_texture_view_width) - 0.5f) / static_cast<float>(m_display_texture_width),
     (static_cast<float>(m_display_texture_view_height) - 0.5f) / static_cast<float>(m_display_texture_height)};
   const auto map = m_display_uniform_buffer.Map(m_context.Get(), sizeof(uniforms), sizeof(uniforms));

src/duckstation-qt/opengldisplaywindow.cpp

@@ -475,10 +475,10 @@ void OpenGLDisplayWindow::renderDisplay()
   glDepthMask(GL_FALSE);
   m_display_program.Bind();
   m_display_program.Uniform4f(
-    0, static_cast<float>(m_display_texture_view_x) / static_cast<float>(m_display_texture_width),
-    static_cast<float>(m_display_texture_view_y) / static_cast<float>(m_display_texture_height),
+    0, (static_cast<float>(m_display_texture_view_x) + 0.25f) / static_cast<float>(m_display_texture_width),
+    (static_cast<float>(m_display_texture_view_y) - 0.25f) / static_cast<float>(m_display_texture_height),
     (static_cast<float>(m_display_texture_view_width) - 0.5f) / static_cast<float>(m_display_texture_width),
-    (static_cast<float>(m_display_texture_view_height) - 0.5f) / static_cast<float>(m_display_texture_height));
+    (static_cast<float>(m_display_texture_view_height) + 0.5f) / static_cast<float>(m_display_texture_height));
   glBindTexture(GL_TEXTURE_2D, static_cast<GLuint>(reinterpret_cast<uintptr_t>(m_display_texture_handle)));
   glBindSampler(0, m_display_linear_filtering ? m_display_linear_sampler : m_display_nearest_sampler);
   glBindVertexArray(m_display_vao);

src/duckstation-sdl/d3d11_host_display.cpp

@@ -395,8 +395,8 @@ void D3D11HostDisplay::RenderDisplay()
     0, 1, m_display_linear_filtering ? m_linear_sampler.GetAddressOf() : m_point_sampler.GetAddressOf());
 
   const float uniforms[4] = {
-    static_cast<float>(m_display_texture_view_x) / static_cast<float>(m_display_texture_width),
-    static_cast<float>(m_display_texture_view_y) / static_cast<float>(m_display_texture_height),
+    (static_cast<float>(m_display_texture_view_x) + 0.25f) / static_cast<float>(m_display_texture_width),
+    (static_cast<float>(m_display_texture_view_y) + 0.25f) / static_cast<float>(m_display_texture_height),
     (static_cast<float>(m_display_texture_view_width) - 0.5f) / static_cast<float>(m_display_texture_width),
     (static_cast<float>(m_display_texture_view_height) - 0.5f) / static_cast<float>(m_display_texture_height)};
   const auto map = m_display_uniform_buffer.Map(m_context.Get(), sizeof(uniforms), sizeof(uniforms));

src/duckstation-sdl/opengl_host_display.cpp

@@ -386,10 +386,10 @@ void OpenGLHostDisplay::RenderDisplay()
   glDepthMask(GL_FALSE);
   m_display_program.Bind();
   m_display_program.Uniform4f(
-    0, static_cast<float>(m_display_texture_view_x) / static_cast<float>(m_display_texture_width),
-    static_cast<float>(m_display_texture_view_y) / static_cast<float>(m_display_texture_height),
+    0, (static_cast<float>(m_display_texture_view_x) + 0.25f) / static_cast<float>(m_display_texture_width),
+    (static_cast<float>(m_display_texture_view_y) - 0.25f) / static_cast<float>(m_display_texture_height),
     (static_cast<float>(m_display_texture_view_width) - 0.5f) / static_cast<float>(m_display_texture_width),
-    (static_cast<float>(m_display_texture_view_height) - 0.5f) / static_cast<float>(m_display_texture_height));
+    (static_cast<float>(m_display_texture_view_height) + 0.5f) / static_cast<float>(m_display_texture_height));
   glBindTexture(GL_TEXTURE_2D, static_cast<GLuint>(reinterpret_cast<uintptr_t>(m_display_texture_handle)));
   glBindSampler(0, m_display_linear_filtering ? m_display_linear_sampler : m_display_nearest_sampler);
   glBindVertexArray(m_display_vao);