radeon: fix pixel readback for RGB8 tests

1 files changed, 8 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/radeon/radeon_screen.c b/src/mesa/drivers/dri/radeon/radeon_screen.c
index 3817007e9e..98fa1417f9 100644
--- a/src/mesa/drivers/dri/radeon/radeon_screen.c
+++ b/src/mesa/drivers/dri/radeon/radeon_screen.c
@@ -1234,7 +1234,7 @@ radeonCreateBuffer( __DRIscreenPrivate *driScrnPriv,
     const GLboolean swAccum = mesaVis->accumRedBits > 0;
     const GLboolean swStencil = mesaVis->stencilBits > 0 &&
 	mesaVis->depthBits != 24;
-    GLenum rgbFormat = (mesaVis->redBits == 5 ? GL_RGB5 : GL_RGBA8);
+    GLenum rgbFormat;
     struct radeon_framebuffer *rfb;
 
     if (isPixmap)
@@ -1246,6 +1246,13 @@ radeonCreateBuffer( __DRIscreenPrivate *driScrnPriv,
 
     _mesa_initialize_framebuffer(&rfb->base, mesaVis);
 
+    if (mesaVis->redBits == 5)
+        rgbFormat = GL_RGB5;
+    else if (mesaVis->alphaBits == 0)
+        rgbFormat = GL_RGB8;
+    else
+        rgbFormat = GL_RGBA8;
+
     /* front color renderbuffer */
     rfb->color_rb[0] = radeon_create_renderbuffer(rgbFormat, driDrawPriv);
     _mesa_add_renderbuffer(&rfb->base, BUFFER_FRONT_LEFT, &rfb->color_rb[0]->base);