[Mesa-dev] [RFC 13/63] mesa/formatquery: Added function to set 'unsupported' responses

[Eduardo Lima Mitev]

From: Antia Puentes <apuentes at igalia.com>

The ARB_internalformat_query2 specification defines which is the
reponse best representing "not supported" or "not applicable" for
each <pname>.

Queries for unsupported features, targets, internalformats, combinations
of: target and internalformat, target and pname, pname and internalformat,
do not return an error but the corresponding 'unsupported' response.
We will use that response as the default answer.

For SAMPLES the 'unsupported' response is to not modify the 'params' buffer.
---
 src/mesa/main/formatquery.c | 106 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)

diff --git a/src/mesa/main/formatquery.c b/src/mesa/main/formatquery.c
index 47ef5cb..a0dc350 100644
--- a/src/mesa/main/formatquery.c
+++ b/src/mesa/main/formatquery.c
@@ -257,6 +257,112 @@ _legal_parameters(struct gl_context *ctx, GLenum target, GLenum internalformat,
    return true;
 }
 
+/* Sets the appropriate "unsupported" response as defined by the
+ * ARB_internalformat_query2 spec for each each <pname>.
+ */
+static void
+_set_default_response(GLenum pname, GLint buffer[16])
+{
+   /* The ARB_internalformat_query2 defines which is the reponse best
+    * representing "not supported" or "not applicable" for each <pname>.
+    *
+    *     " In general:
+    *          - size- or count-based queries will return zero,
+    *          - support-, format- or type-based queries will return NONE,
+    *          - boolean-based queries will return FALSE, and
+    *          - list-based queries return no entries."
+    */
+   switch(pname) {
+   case GL_SAMPLES:
+      break;
+
+   case GL_MAX_COMBINED_DIMENSIONS:
+   case GL_NUM_SAMPLE_COUNTS:
+   case GL_INTERNALFORMAT_RED_SIZE:
+   case GL_INTERNALFORMAT_GREEN_SIZE:
+   case GL_INTERNALFORMAT_BLUE_SIZE:
+   case GL_INTERNALFORMAT_ALPHA_SIZE:
+   case GL_INTERNALFORMAT_DEPTH_SIZE:
+   case GL_INTERNALFORMAT_STENCIL_SIZE:
+   case GL_INTERNALFORMAT_SHARED_SIZE:
+   case GL_MAX_WIDTH:
+   case GL_MAX_HEIGHT:
+   case GL_MAX_DEPTH:
+   case GL_MAX_LAYERS:
+   case GL_IMAGE_TEXEL_SIZE:
+   case GL_TEXTURE_COMPRESSED_BLOCK_WIDTH:
+   case GL_TEXTURE_COMPRESSED_BLOCK_HEIGHT:
+   case GL_TEXTURE_COMPRESSED_BLOCK_SIZE:
+      buffer[0] = 0;
+      break;
+
+   case GL_INTERNALFORMAT_PREFERRED:
+   case GL_INTERNALFORMAT_RED_TYPE:
+   case GL_INTERNALFORMAT_GREEN_TYPE:
+   case GL_INTERNALFORMAT_BLUE_TYPE:
+   case GL_INTERNALFORMAT_ALPHA_TYPE:
+   case GL_INTERNALFORMAT_DEPTH_TYPE:
+   case GL_INTERNALFORMAT_STENCIL_TYPE:
+   case GL_FRAMEBUFFER_RENDERABLE:
+   case GL_FRAMEBUFFER_RENDERABLE_LAYERED:
+   case GL_FRAMEBUFFER_BLEND:
+   case GL_READ_PIXELS:
+   case GL_READ_PIXELS_FORMAT:
+   case GL_READ_PIXELS_TYPE:
+   case GL_TEXTURE_IMAGE_FORMAT:
+   case GL_TEXTURE_IMAGE_TYPE:
+   case GL_GET_TEXTURE_IMAGE_FORMAT:
+   case GL_GET_TEXTURE_IMAGE_TYPE:
+   case GL_MANUAL_GENERATE_MIPMAP:
+   case GL_AUTO_GENERATE_MIPMAP:
+   case GL_COLOR_ENCODING:
+   case GL_SRGB_READ:
+   case GL_SRGB_WRITE:
+   case GL_SRGB_DECODE_ARB:
+   case GL_FILTER:
+   case GL_VERTEX_TEXTURE:
+   case GL_TESS_CONTROL_TEXTURE:
+   case GL_TESS_EVALUATION_TEXTURE:
+   case GL_GEOMETRY_TEXTURE:
+   case GL_FRAGMENT_TEXTURE:
+   case GL_COMPUTE_TEXTURE:
+   case GL_TEXTURE_SHADOW:
+   case GL_TEXTURE_GATHER:
+   case GL_TEXTURE_GATHER_SHADOW:
+   case GL_SHADER_IMAGE_LOAD:
+   case GL_SHADER_IMAGE_STORE:
+   case GL_SHADER_IMAGE_ATOMIC:
+   case GL_IMAGE_COMPATIBILITY_CLASS:
+   case GL_IMAGE_PIXEL_FORMAT:
+   case GL_IMAGE_PIXEL_TYPE:
+   case GL_IMAGE_FORMAT_COMPATIBILITY_TYPE:
+   case GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_TEST:
+   case GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_TEST:
+   case GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_WRITE:
+   case GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_WRITE:
+   case GL_CLEAR_BUFFER:
+   case GL_TEXTURE_VIEW:
+   case GL_VIEW_COMPATIBILITY_CLASS:
+      buffer[0] = GL_NONE;
+      break;
+
+   case GL_INTERNALFORMAT_SUPPORTED:
+   case GL_COLOR_COMPONENTS:
+   case GL_DEPTH_COMPONENTS:
+   case GL_STENCIL_COMPONENTS:
+   case GL_COLOR_RENDERABLE:
+   case GL_DEPTH_RENDERABLE:
+   case GL_STENCIL_RENDERABLE:
+   case GL_MIPMAP:
+   case GL_TEXTURE_COMPRESSED:
+      buffer[0] = GL_FALSE;
+      break;
+
+   default:
+      unreachable("invalid 'pname'");
+   }
+}
+
 /* default implementation of QueryInternalFormat driverfunc, for
  * drivers not implementing ARB_internalformat_query2.
  */
-- 
2.5.3