mesa: provide default implementation of QuerySamplesForFormat

Previously at least i915 failed to provide an implementation, but
exposed ARB_internalformat_query anyway, leading to crashes when
QueryInternalformativ was called.

Default implementation just returns 1 for everything, so is suitable for
any driver which does not support multisampling.

V2: - Move from intel to core mesa.

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 19 insertions, 0 deletions

diff --git a/src/mesa/main/formatquery.c b/src/mesa/main/formatquery.c
index 78c5fbe5e2b..e45dc868060 100644
--- a/src/mesa/main/formatquery.c
+++ b/src/mesa/main/formatquery.c
@@ -30,6 +30,21 @@
 #include "fbobject.h"
 #include "formatquery.h"
 
+/* default implementation of QuerySamplesForFormat driverfunc, for
+ * non-multisample-capable drivers. */
+size_t
+_mesa_query_samples_for_format(struct gl_context *ctx, GLenum target,
+                               GLenum internalFormat, int samples[16])
+{
+   (void) target;
+   (void) internalFormat;
+   (void) ctx;
+
+   samples[0] = 1;
+   return 1;
+}
+
+
 void GLAPIENTRY
 _mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname,
                           GLsizei bufSize, GLint *params)
diff --git a/src/mesa/main/formatquery.h b/src/mesa/main/formatquery.h
index 585c3eb64ba..603400059e5 100644
--- a/src/mesa/main/formatquery.h
+++ b/src/mesa/main/formatquery.h
@@ -28,6 +28,10 @@
 #include "compiler.h"
 #include "glheader.h"
 
+size_t
+_mesa_query_samples_for_format(struct gl_context *ctx, GLenum target,
+                               GLenum internalFormat, int samples[16]);
+
 extern void GLAPIENTRY
 _mesa_GetInternalformativ(GLenum target, GLenum internalformat,
                           GLenum pname, GLsizei bufSize, GLint *params);