Mesa (master): r300g: add support for formats beginning with X, like X8R8G8B8

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 94e9ab975cb4187a63eeb4cd03694ebd3cb27bd8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=94e9ab975cb4187a63eeb4cd03694ebd3cb27bd8

Author: Marek Olšák <maraeo at gmail.com>
Date:   Wed Sep 29 17:54:31 2010 +0200

r300g: add support for formats beginning with X, like X8R8G8B8

This is actually a format translator fix.

---

 src/gallium/drivers/r300/r300_state_inlines.h |   18 +++++++++---
 src/gallium/drivers/r300/r300_texture.c       |   34 +++++++++++++++++++-----
 2 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_state_inlines.h b/src/gallium/drivers/r300/r300_state_inlines.h
index 03ec127..7e50122 100644
--- a/src/gallium/drivers/r300/r300_state_inlines.h
+++ b/src/gallium/drivers/r300/r300_state_inlines.h
@@ -364,6 +364,7 @@ static INLINE uint16_t
 r300_translate_vertex_data_type(enum pipe_format format) {
     uint32_t result = 0;
     const struct util_format_description *desc;
+    unsigned i;
 
     desc = util_format_description(format);
 
@@ -371,10 +372,17 @@ r300_translate_vertex_data_type(enum pipe_format format) {
         return R300_INVALID_FORMAT;
     }
 
-    switch (desc->channel[0].type) {
+    /* Find the first non-VOID channel. */
+    for (i = 0; i < 4; i++) {
+        if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
+            break;
+        }
+    }
+
+    switch (desc->channel[i].type) {
         /* Half-floats, floats, doubles */
         case UTIL_FORMAT_TYPE_FLOAT:
-            switch (desc->channel[0].size) {
+            switch (desc->channel[i].size) {
                 case 16:
                     /* Supported only on RV350 and later. */
                     if (desc->nr_channels > 2) {
@@ -394,7 +402,7 @@ r300_translate_vertex_data_type(enum pipe_format format) {
         case UTIL_FORMAT_TYPE_UNSIGNED:
         /* Signed ints */
         case UTIL_FORMAT_TYPE_SIGNED:
-            switch (desc->channel[0].size) {
+            switch (desc->channel[i].size) {
                 case 8:
                     result = R300_DATA_TYPE_BYTE;
                     break;
@@ -413,10 +421,10 @@ r300_translate_vertex_data_type(enum pipe_format format) {
             return R300_INVALID_FORMAT;
     }
 
-    if (desc->channel[0].type == UTIL_FORMAT_TYPE_SIGNED) {
+    if (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED) {
         result |= R300_SIGNED;
     }
-    if (desc->channel[0].normalized) {
+    if (desc->channel[i].normalized) {
         result |= R300_NORMALIZE;
     }
 
diff --git a/src/gallium/drivers/r300/r300_texture.c b/src/gallium/drivers/r300/r300_texture.c
index a7911c6..2d8431d 100644
--- a/src/gallium/drivers/r300/r300_texture.c
+++ b/src/gallium/drivers/r300/r300_texture.c
@@ -260,16 +260,26 @@ uint32_t r300_translate_texformat(enum pipe_format format,
         return ~0; /* Unsupported/unknown. */
     }
 
+    /* Find the first non-VOID channel. */
+    for (i = 0; i < 4; i++) {
+        if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
+            break;
+        }
+    }
+
+    if (i == 4)
+        return ~0; /* Unsupported/unknown. */
+
     /* And finally, uniform formats. */
-    switch (desc->channel[0].type) {
+    switch (desc->channel[i].type) {
         case UTIL_FORMAT_TYPE_UNSIGNED:
         case UTIL_FORMAT_TYPE_SIGNED:
-            if (!desc->channel[0].normalized &&
+            if (!desc->channel[i].normalized &&
                 desc->colorspace != UTIL_FORMAT_COLORSPACE_SRGB) {
                 return ~0;
             }
 
-            switch (desc->channel[0].size) {
+            switch (desc->channel[i].size) {
                 case 4:
                     switch (desc->nr_channels) {
                         case 2:
@@ -303,7 +313,7 @@ uint32_t r300_translate_texformat(enum pipe_format format,
             return ~0;
 
         case UTIL_FORMAT_TYPE_FLOAT:
-            switch (desc->channel[0].size) {
+            switch (desc->channel[i].size) {
                 case 16:
                     switch (desc->nr_channels) {
                         case 1:
@@ -443,15 +453,25 @@ static uint32_t r300_translate_out_fmt(enum pipe_format format)
 
     desc = util_format_description(format);
 
+    /* Find the first non-VOID channel. */
+    for (i = 0; i < 4; i++) {
+        if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
+            break;
+        }
+    }
+
+    if (i == 4)
+        return ~0; /* Unsupported/unknown. */
+
     /* Specifies how the shader output is written to the fog unit. */
-    if (desc->channel[0].type == UTIL_FORMAT_TYPE_FLOAT) {
-        if (desc->channel[0].size == 32) {
+    if (desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT) {
+        if (desc->channel[i].size == 32) {
             modifier |= R300_US_OUT_FMT_C4_32_FP;
         } else {
             modifier |= R300_US_OUT_FMT_C4_16_FP;
         }
     } else {
-        if (desc->channel[0].size == 16) {
+        if (desc->channel[i].size == 16) {
             modifier |= R300_US_OUT_FMT_C4_16;
         } else {
             /* C4_8 seems to be used for the formats whose pixel size