Use linear filtering for colorbuffer textures

Switch the min and mag filters for the ColorBuffer's texture object to
linear instead of nearest. This gives much better results when posting
a colorbuffer to a scaled framebuffer, which happens when the android
screen + emulator skin is too big to fit on the user's display.

The ColorBuffer's own texture object is only actually used as a
texture during post(); when used as a texture by the guest system
(e.g. by surfaceflinger composition) it's mapped through an EGLImage
to a guest-owned texture object, which has its own filter settings. So
we can just change the filter settings for the ColorBuffer texture
object at initialization without affecting anything else.

SDK Bug: 6721429

Change-Id: I8ec81125d076e0ed77a44f8b0dce412fa3cecabf

1 files changed, 2 insertions, 2 deletions

diff --git a/emulator/opengl/host/libs/libOpenglRender/ColorBuffer.cpp b/emulator/opengl/host/libs/libOpenglRender/ColorBuffer.cpp
index 681db8b..e50b8ec 100644
--- a/emulator/opengl/host/libs/libOpenglRender/ColorBuffer.cpp
+++ b/emulator/opengl/host/libs/libOpenglRender/ColorBuffer.cpp
@@ -66,8 +66,8 @@ ColorBuffer *ColorBuffer::create(int p_width, int p_height,
                       texInternalFormat,
                       GL_UNSIGNED_BYTE, zBuff);
     delete [] zBuff;
-    s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     s_gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     s_gl.glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);