formats: Emulate more alpha formats directly on the host

Since we use GLES or the GL core profile on the host, the
alpha formats will not be available anyway, so just emulate
them right away, this helps to fix more piglits from

  bin/arb_texture_buffer_object-formats fs arb

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: maksym.wezdecki@collabora.com

src/vrend_formats.c

@@ -31,6 +31,7 @@
 #define NO_SWIZZLE { SWIZZLE_INVALID, SWIZZLE_INVALID, SWIZZLE_INVALID, SWIZZLE_INVALID }
 #define RRR1_SWIZZLE { PIPE_SWIZZLE_RED, PIPE_SWIZZLE_RED, PIPE_SWIZZLE_RED, PIPE_SWIZZLE_ONE }
 #define RGB1_SWIZZLE { PIPE_SWIZZLE_RED, PIPE_SWIZZLE_GREEN, PIPE_SWIZZLE_BLUE, PIPE_SWIZZLE_ONE }
+#define OOOR_SWIZZLE { PIPE_SWIZZLE_ZERO, PIPE_SWIZZLE_ZERO, PIPE_SWIZZLE_ZERO, PIPE_SWIZZLE_RED  }
 
 #define BGR1_SWIZZLE { PIPE_SWIZZLE_BLUE, PIPE_SWIZZLE_GREEN, PIPE_SWIZZLE_RED, PIPE_SWIZZLE_ONE }
 #define BGRA_SWIZZLE { PIPE_SWIZZLE_BLUE, PIPE_SWIZZLE_GREEN, PIPE_SWIZZLE_RED, PIPE_SWIZZLE_ALPHA }
@@ -131,11 +132,11 @@ static struct vrend_format_table float_base_formats[] = {
 };
 
 static struct vrend_format_table float_la_formats[] = {
-  { VIRGL_FORMAT_A16_FLOAT, GL_ALPHA16F_ARB, GL_ALPHA, GL_HALF_FLOAT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A16_FLOAT, GL_R16F, GL_RED, GL_HALF_FLOAT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L16_FLOAT, GL_R16F, GL_RED, GL_HALF_FLOAT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L16A16_FLOAT, GL_LUMINANCE_ALPHA16F_ARB, GL_LUMINANCE_ALPHA, GL_HALF_FLOAT, NO_SWIZZLE },
 
-  { VIRGL_FORMAT_A32_FLOAT, GL_ALPHA32F_ARB, GL_ALPHA, GL_FLOAT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A32_FLOAT, GL_R32F, GL_RED, GL_FLOAT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L32_FLOAT, GL_R32F, GL_RED, GL_FLOAT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L32A32_FLOAT, GL_LUMINANCE_ALPHA32F_ARB, GL_LUMINANCE_ALPHA, GL_FLOAT, NO_SWIZZLE },
 };
@@ -171,26 +172,26 @@ static struct vrend_format_table float_3comp_formats[] = {
 
 
 static struct vrend_format_table integer_la_formats[] = {
-  { VIRGL_FORMAT_A8_UINT, GL_ALPHA8UI_EXT, GL_ALPHA_INTEGER, GL_UNSIGNED_BYTE, NO_SWIZZLE },
+  { VIRGL_FORMAT_A8_UINT, GL_R8UI, GL_RED_INTEGER, GL_UNSIGNED_BYTE, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L8_UINT, GL_R8UI, GL_RED_INTEGER, GL_UNSIGNED_BYTE, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L8A8_UINT, GL_LUMINANCE_ALPHA8UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_BYTE, NO_SWIZZLE },
-  { VIRGL_FORMAT_A8_SINT, GL_ALPHA8I_EXT, GL_ALPHA_INTEGER, GL_BYTE, NO_SWIZZLE },
+  { VIRGL_FORMAT_A8_SINT, GL_R8I, GL_RED_INTEGER, GL_BYTE, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L8_SINT, GL_R8I, GL_RED_INTEGER, GL_BYTE, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L8A8_SINT, GL_LUMINANCE_ALPHA8I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_BYTE, NO_SWIZZLE },
 
-  { VIRGL_FORMAT_A16_UINT, GL_ALPHA16UI_EXT, GL_ALPHA_INTEGER, GL_UNSIGNED_SHORT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A16_UINT, GL_R16UI, GL_RED_INTEGER, GL_UNSIGNED_SHORT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L16_UINT, GL_R16UI, GL_RED_INTEGER, GL_UNSIGNED_SHORT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L16A16_UINT, GL_LUMINANCE_ALPHA16UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_SHORT, NO_SWIZZLE },
 
-  { VIRGL_FORMAT_A16_SINT, GL_ALPHA16I_EXT, GL_ALPHA_INTEGER, GL_SHORT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A16_SINT, GL_R16I, GL_RED_INTEGER, GL_SHORT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L16_SINT, GL_R16I, GL_RED_INTEGER, GL_SHORT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L16A16_SINT, GL_LUMINANCE_ALPHA16I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_SHORT, NO_SWIZZLE },
 
-  { VIRGL_FORMAT_A32_UINT, GL_ALPHA32UI_EXT, GL_ALPHA_INTEGER, GL_UNSIGNED_INT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A32_UINT, GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L32_UINT, GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L32A32_UINT, GL_LUMINANCE_ALPHA32UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_INT, NO_SWIZZLE },
 
-  { VIRGL_FORMAT_A32_SINT, GL_ALPHA32I_EXT, GL_ALPHA_INTEGER, GL_INT, NO_SWIZZLE },
+  { VIRGL_FORMAT_A32_SINT, GL_R32I, GL_RED_INTEGER, GL_INT, OOOR_SWIZZLE },
   { VIRGL_FORMAT_L32_SINT, GL_R32I, GL_RED_INTEGER, GL_INT, RRR1_SWIZZLE },
   { VIRGL_FORMAT_L32A32_SINT, GL_LUMINANCE_ALPHA32I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_INT, NO_SWIZZLE },