mesa git update 12 July 2011

4 files changed, 91 insertions, 64 deletions

diff --git a/mesalib/src/glsl/ir_function.cpp b/mesalib/src/glsl/ir_function.cpp
index 1255072a5..0f2f1a0ee 100644
--- a/mesalib/src/glsl/ir_function.cpp
+++ b/mesalib/src/glsl/ir_function.cpp
@@ -165,8 +165,18 @@ ir_function_signature *
 ir_function::matching_signature(const exec_list *actual_parameters)
 {
    ir_function_signature *match = NULL;
-   int matched_score = 0;
-
+   bool multiple_inexact_matches = false;
+
+   /* From page 42 (page 49 of the PDF) of the GLSL 1.20 spec:
+    *
+    * "If an exact match is found, the other signatures are ignored, and
+    *  the exact match is used.  Otherwise, if no exact match is found, then
+    *  the implicit conversions in Section 4.1.10 "Implicit Conversions" will
+    *  be applied to the calling arguments if this can make their types match
+    *  a signature.  In this case, it is a semantic error if there are
+    *  multiple ways to apply these conversions to the actual arguments of a
+    *  call such that the call can be made to match multiple signatures."
+    */
    foreach_iter(exec_list_iterator, iter, signatures) {
       ir_function_signature *const sig =
 	 (ir_function_signature *) iter.get();
@@ -178,13 +188,24 @@ ir_function::matching_signature(const exec_list *actual_parameters)
       if (score == 0)
 	 return sig;
 
-      /* If we found a match with fewer conversions, use that instead */
-      if (score > 0 && (match == NULL || score < matched_score)) {
-	 match = sig;
-	 matched_score = score;
+      if (score > 0) {
+	 if (match == NULL)
+	    match = sig;
+	 else
+	    multiple_inexact_matches = true;
       }
    }
 
+   /* There is no exact match (we would have returned it by now).  If there
+    * are multiple inexact matches, the call is ambiguous, which is an error.
+    *
+    * FINISHME: Report a decent error.  Returning NULL will likely result in
+    * FINISHME: a "no matching signature" error; it should report that the
+    * FINISHME: call is ambiguous.  But reporting errors from here is hard.
+    */
+   if (multiple_inexact_matches)
+      return NULL;
+
    return match;
 }
 
diff --git a/mesalib/src/mesa/main/depthstencil.c b/mesalib/src/mesa/main/depthstencil.c
index 4d0600050..40d6c9612 100644
--- a/mesalib/src/mesa/main/depthstencil.c
+++ b/mesalib/src/mesa/main/depthstencil.c
@@ -63,7 +63,8 @@ static void
 delete_wrapper(struct gl_renderbuffer *rb)
 {
    ASSERT(rb->Format == MESA_FORMAT_S8 ||
-          rb->Format == MESA_FORMAT_X8_Z24);
+          rb->Format == MESA_FORMAT_X8_Z24 ||
+          rb->Format == MESA_FORMAT_Z32_FLOAT);
    _mesa_reference_renderbuffer(&rb->Wrapped, NULL);
    free(rb);
 }
diff --git a/mesalib/src/mesa/main/formats.c b/mesalib/src/mesa/main/formats.c
index f58b19756..f9298d2d1 100644
--- a/mesalib/src/mesa/main/formats.c
+++ b/mesalib/src/mesa/main/formats.c
@@ -1485,7 +1485,9 @@ _mesa_test_formats(void)
              info->DataType == GL_SIGNED_NORMALIZED ||
              info->DataType == GL_UNSIGNED_INT ||
              info->DataType == GL_INT ||
-             info->DataType == GL_FLOAT);
+             info->DataType == GL_FLOAT ||
+             /* Z32_FLOAT_X24S8 has DataType of GL_NONE */
+             info->DataType == GL_NONE);
 
       if (info->BaseFormat == GL_RGB) {
          assert(info->RedBits > 0);
diff --git a/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c b/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
index dca332464..1d908c031 100644
--- a/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -273,26 +273,6 @@ make_passthrough_vertex_shader(struct st_context *st,
 
 
 /**
- * Return a texture base format for drawing/copying an image
- * of the given format.
- */
-static GLenum
-base_format(GLenum format)
-{
-   switch (format) {
-   case GL_DEPTH_COMPONENT:
-      return GL_DEPTH_COMPONENT;
-   case GL_DEPTH_STENCIL:
-      return GL_DEPTH_STENCIL;
-   case GL_STENCIL_INDEX:
-      return GL_STENCIL_INDEX;
-   default:
-      return GL_RGBA;
-   }
-}
-
-
-/**
  * Return a texture internalFormat for drawing/copying an image
  * of the given format and type.
  */
@@ -301,11 +281,36 @@ internal_format(struct gl_context *ctx, GLenum format, GLenum type)
 {
    switch (format) {
    case GL_DEPTH_COMPONENT:
-      return GL_DEPTH_COMPONENT;
+      switch (type) {
+      case GL_UNSIGNED_SHORT:
+         return GL_DEPTH_COMPONENT16;
+
+      case GL_UNSIGNED_INT:
+         return GL_DEPTH_COMPONENT32;
+
+      case GL_FLOAT:
+         if (ctx->Extensions.ARB_depth_buffer_float)
+            return GL_DEPTH_COMPONENT32F;
+         else
+            return GL_DEPTH_COMPONENT;
+
+      default:
+         return GL_DEPTH_COMPONENT;
+      }
+
    case GL_DEPTH_STENCIL:
-      return GL_DEPTH_STENCIL;
+      switch (type) {
+      case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+         return GL_DEPTH32F_STENCIL8;
+
+      case GL_UNSIGNED_INT_24_8:
+      default:
+         return GL_DEPTH24_STENCIL8;
+      }
+
    case GL_STENCIL_INDEX:
       return GL_STENCIL_INDEX;
+
    default:
       if (_mesa_is_integer_format(format)) {
          switch (type) {
@@ -999,7 +1004,6 @@ st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,
    GLboolean write_stencil = GL_FALSE, write_depth = GL_FALSE;
    struct pipe_sampler_view *sv[2];
    int num_sampler_view = 1;
-   enum pipe_format stencil_format = PIPE_FORMAT_NONE;
    struct st_fp_variant *fpv;
 
    if (format == GL_DEPTH_STENCIL)
@@ -1009,33 +1013,12 @@ st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,
    else if (format == GL_DEPTH_COMPONENT)
       write_depth = GL_TRUE;
 
-   if (write_stencil) {
-      enum pipe_format tex_format;
-      /* can we write to stencil if not fallback */
-      if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT))
-	 goto stencil_fallback;
-
-      tex_format = st_choose_format(st->pipe->screen, base_format(format),
-                                    GL_NONE, GL_NONE,
-                                    PIPE_TEXTURE_2D,
-				    0, PIPE_BIND_SAMPLER_VIEW);
-
-      switch (tex_format) {
-      case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
-         stencil_format = PIPE_FORMAT_X24S8_USCALED;
-         break;
-      case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
-         stencil_format = PIPE_FORMAT_S8X24_USCALED;
-         break;
-      case PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED:
-         stencil_format = PIPE_FORMAT_X32_S8X24_USCALED;
-         break;
-      case PIPE_FORMAT_S8_USCALED:
-         stencil_format = PIPE_FORMAT_S8_USCALED;
-         break;
-      default:
-         goto stencil_fallback;
-      }
+   if (write_stencil &&
+       !pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
+      /* software fallback */
+      draw_stencil_pixels(ctx, x, y, width, height, format, type,
+                          unpack, pixels);
+      return;
    }
 
    /* Mesa state should be up to date by now */
@@ -1080,7 +1063,32 @@ st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,
          sv[0] = st_create_texture_sampler_view(st->pipe, pt);
 
          if (sv[0]) {
-	    if (write_stencil) {
+            /* Create a second sampler view to read stencil.
+             * The stencil is written using the shader stencil export
+             * functionality. */
+            if (write_stencil) {
+               enum pipe_format stencil_format = PIPE_FORMAT_NONE;
+
+               switch (pt->format) {
+               case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
+               case PIPE_FORMAT_X24S8_USCALED:
+                  stencil_format = PIPE_FORMAT_X24S8_USCALED;
+                  break;
+               case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
+               case PIPE_FORMAT_S8X24_USCALED:
+                  stencil_format = PIPE_FORMAT_S8X24_USCALED;
+                  break;
+               case PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED:
+               case PIPE_FORMAT_X32_S8X24_USCALED:
+                  stencil_format = PIPE_FORMAT_X32_S8X24_USCALED;
+                  break;
+               case PIPE_FORMAT_S8_USCALED:
+                  stencil_format = PIPE_FORMAT_S8_USCALED;
+                  break;
+               default:
+                  assert(0);
+               }
+
 	       sv[1] = st_create_texture_sampler_view_format(st->pipe, pt,
                                                              stencil_format);
 	       num_sampler_view++;
@@ -1101,11 +1109,6 @@ st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,
          pipe_resource_reference(&pt, NULL);
       }
    }
-   return;
-
-stencil_fallback:
-   draw_stencil_pixels(ctx, x, y, width, height, format, type,
-		       unpack, pixels);
 }