From 9a5b2899e058f3ec31a4eba5575eaa3fcfe1e3f5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Thu, 8 Sep 2011 20:16:18 -0600
Subject: mesa: added _mesa_get_uncompressed_format(),
 _mesa_format_num_components()

---
 src/mesa/main/formats.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/mesa/main/formats.h |  7 ++++++
 2 files changed, 71 insertions(+)

(limited to 'src/mesa/main')

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index c6634c458de..11d670689bf 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1342,6 +1342,70 @@ _mesa_get_srgb_format_linear(gl_format format)
 }
 
 
+/**
+ * If the given format is a compressed format, return a corresponding
+ * uncompressed format.
+ */
+gl_format
+_mesa_get_uncompressed_format(gl_format format)
+{
+   switch (format) {
+   case MESA_FORMAT_RGB_FXT1:
+      return MESA_FORMAT_RGB888;
+   case MESA_FORMAT_RGBA_FXT1:
+      return MESA_FORMAT_RGBA8888;
+   case MESA_FORMAT_RGB_DXT1:
+   case MESA_FORMAT_SRGB_DXT1:
+      return MESA_FORMAT_RGB888;
+   case MESA_FORMAT_RGBA_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+      return MESA_FORMAT_RGBA8888;
+   case MESA_FORMAT_RGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT3:
+      return MESA_FORMAT_RGBA8888;
+   case MESA_FORMAT_RGBA_DXT5:
+   case MESA_FORMAT_SRGBA_DXT5:
+      return MESA_FORMAT_RGBA8888;
+   case MESA_FORMAT_RED_RGTC1:
+      return MESA_FORMAT_R8;
+   case MESA_FORMAT_SIGNED_RED_RGTC1:
+      return MESA_FORMAT_SIGNED_R8;
+   case MESA_FORMAT_RG_RGTC2:
+      return MESA_FORMAT_RG88;
+   case MESA_FORMAT_SIGNED_RG_RGTC2:
+      return MESA_FORMAT_SIGNED_RG88_REV;
+   case MESA_FORMAT_L_LATC1:
+      return MESA_FORMAT_L8;
+   case MESA_FORMAT_SIGNED_L_LATC1:
+      return MESA_FORMAT_SIGNED_L8;
+   case MESA_FORMAT_LA_LATC2:
+      return MESA_FORMAT_AL88;
+   case MESA_FORMAT_SIGNED_LA_LATC2:
+      return MESA_FORMAT_SIGNED_AL88;
+   default:
+#ifdef DEBUG
+      assert(!_mesa_is_format_compressed(format));
+#endif
+      return format;
+   }
+}
+
+
+GLuint
+_mesa_format_num_components(gl_format format)
+{
+   const struct gl_format_info *info = _mesa_get_format_info(format);
+   return ((info->RedBits > 0) +
+           (info->GreenBits > 0) +
+           (info->BlueBits > 0) +
+           (info->AlphaBits > 0) +
+           (info->LuminanceBits > 0) +
+           (info->IntensityBits > 0) +
+           (info->DepthBits > 0) +
+           (info->StencilBits > 0));
+}
+
+
 /**
  * Return number of bytes needed to store an image of the given size
  * in the given format.
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 75d93debaca..610204cb37c 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -266,4 +266,11 @@ _mesa_test_formats(void);
 extern gl_format
 _mesa_get_srgb_format_linear(gl_format format);
 
+extern gl_format
+_mesa_get_uncompressed_format(gl_format format);
+
+extern GLuint
+_mesa_format_num_components(gl_format format);
+
+
 #endif /* FORMATS_H */
-- 
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