i965/blorp: Expose coordinate scissoring and mirroring

Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

4 files changed, 213 insertions, 118 deletions

diff --git a/src/mesa/drivers/dri/i965/Makefile.sources b/src/mesa/drivers/dri/i965/Makefile.sources
index 87c73ba..9379fd2 100644
--- a/src/mesa/drivers/dri/i965/Makefile.sources
+++ b/src/mesa/drivers/dri/i965/Makefile.sources
@@ -76,6 +76,7 @@ i965_FILES = \
 	brw_lower_texture_gradients.cpp \
 	brw_lower_unnormalized_offset.cpp \
 	brw_meta_updownsample.c \
+	brw_meta_util.c \
 	brw_misc_state.c \
 	brw_object_purgeable.c \
 	brw_performance_monitor.c \
diff --git a/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp b/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
index 300ff5c..fe75100 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
@@ -31,87 +31,10 @@
 #include "brw_context.h"
 #include "brw_blorp_blit_eu.h"
 #include "brw_state.h"
+#include "brw_meta_util.h"
 
 #define FILE_DEBUG_FLAG DEBUG_BLORP
 
-/**
- * Helper function for handling mirror image blits.
- *
- * If coord0 > coord1, swap them and invert the "mirror" boolean.
- */
-static inline void
-fixup_mirroring(bool &mirror, GLfloat &coord0, GLfloat &coord1)
-{
-   if (coord0 > coord1) {
-      mirror = !mirror;
-      GLfloat tmp = coord0;
-      coord0 = coord1;
-      coord1 = tmp;
-   }
-}
-
-
-/**
- * Adjust {src,dst}_x{0,1} to account for clipping and scissoring of
- * destination coordinates.
- *
- * Return true if there is still blitting to do, false if all pixels got
- * rejected by the clip and/or scissor.
- *
- * For clarity, the nomenclature of this function assumes we are clipping and
- * scissoring the X coordinate; the exact same logic applies for Y
- * coordinates.
- *
- * Note: this function may also be used to account for clipping of source
- * coordinates, by swapping the roles of src and dst.
- */
-static inline bool
-clip_or_scissor(bool mirror, GLfloat &src_x0, GLfloat &src_x1, GLfloat &dst_x0,
-                GLfloat &dst_x1, GLfloat fb_xmin, GLfloat fb_xmax)
-{
-   float scale = (float) (src_x1 - src_x0) / (dst_x1 - dst_x0);
-   /* If we are going to scissor everything away, stop. */
-   if (!(fb_xmin < fb_xmax &&
-         dst_x0 < fb_xmax &&
-         fb_xmin < dst_x1 &&
-         dst_x0 < dst_x1)) {
-      return false;
-   }
-
-   /* Clip the destination rectangle, and keep track of how many pixels we
-    * clipped off of the left and right sides of it.
-    */
-   GLint pixels_clipped_left = 0;
-   GLint pixels_clipped_right = 0;
-   if (dst_x0 < fb_xmin) {
-      pixels_clipped_left = fb_xmin - dst_x0;
-      dst_x0 = fb_xmin;
-   }
-   if (fb_xmax < dst_x1) {
-      pixels_clipped_right = dst_x1 - fb_xmax;
-      dst_x1 = fb_xmax;
-   }
-
-   /* If we are mirrored, then before applying pixels_clipped_{left,right} to
-    * the source coordinates, we need to flip them to account for the
-    * mirroring.
-    */
-   if (mirror) {
-      GLint tmp = pixels_clipped_left;
-      pixels_clipped_left = pixels_clipped_right;
-      pixels_clipped_right = tmp;
-   }
-
-   /* Adjust the source rectangle to remove the pixels corresponding to those
-    * that were clipped/scissored out of the destination rectangle.
-    */
-   src_x0 += pixels_clipped_left * scale;
-   src_x1 -= pixels_clipped_right * scale;
-
-   return true;
-}
-
-
 static struct intel_mipmap_tree *
 find_miptree(GLbitfield buffer_bit, struct intel_renderbuffer *irb)
 {
@@ -244,47 +167,12 @@ try_blorp_blit(struct brw_context *brw,
    const struct gl_framebuffer *read_fb = ctx->ReadBuffer;
    const struct gl_framebuffer *draw_fb = ctx->DrawBuffer;
 
-   /* Detect if the blit needs to be mirrored */
-   bool mirror_x = false, mirror_y = false;
-   fixup_mirroring(mirror_x, srcX0, srcX1);
-   fixup_mirroring(mirror_x, dstX0, dstX1);
-   fixup_mirroring(mirror_y, srcY0, srcY1);
-   fixup_mirroring(mirror_y, dstY0, dstY1);
-
-   /* If the destination rectangle needs to be clipped or scissored, do so.
-    */
-   if (!(clip_or_scissor(mirror_x, srcX0, srcX1, dstX0, dstX1,
-                         draw_fb->_Xmin, draw_fb->_Xmax) &&
-         clip_or_scissor(mirror_y, srcY0, srcY1, dstY0, dstY1,
-                         draw_fb->_Ymin, draw_fb->_Ymax))) {
-      /* Everything got clipped/scissored away, so the blit was successful. */
-      return true;
-   }
-
-   /* If the source rectangle needs to be clipped or scissored, do so. */
-   if (!(clip_or_scissor(mirror_x, dstX0, dstX1, srcX0, srcX1,
-                         0, read_fb->Width) &&
-         clip_or_scissor(mirror_y, dstY0, dstY1, srcY0, srcY1,
-                         0, read_fb->Height))) {
-      /* Everything got clipped/scissored away, so the blit was successful. */
+   bool mirror_x, mirror_y;
+   if (brw_meta_mirror_clip_and_scissor(ctx,
+                                        &srcX0, &srcY0, &srcX1, &srcY1,
+                                        &dstX0, &dstY0, &dstX1, &dstY1,
+                                        &mirror_x, &mirror_y))
       return true;
-   }
-
-   /* Account for the fact that in the system framebuffer, the origin is at
-    * the lower left.
-    */
-   if (_mesa_is_winsys_fbo(read_fb)) {
-      GLint tmp = read_fb->Height - srcY0;
-      srcY0 = read_fb->Height - srcY1;
-      srcY1 = tmp;
-      mirror_y = !mirror_y;
-   }
-   if (_mesa_is_winsys_fbo(draw_fb)) {
-      GLint tmp = draw_fb->Height - dstY0;
-      dstY0 = draw_fb->Height - dstY1;
-      dstY1 = tmp;
-      mirror_y = !mirror_y;
-   }
 
    /* Find buffers */
    struct intel_renderbuffer *src_irb;
diff --git a/src/mesa/drivers/dri/i965/brw_meta_util.c b/src/mesa/drivers/dri/i965/brw_meta_util.c
new file mode 100644
index 0000000..72ed96c
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/brw_meta_util.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "brw_meta_util.h"
+#include "main/fbobject.h"
+
+/**
+ * Helper function for handling mirror image blits.
+ *
+ * If coord0 > coord1, swap them and invert the "mirror" boolean.
+ */
+static inline void
+fixup_mirroring(bool *mirror, float *coord0, float *coord1)
+{
+   if (*coord0 > *coord1) {
+      *mirror = !*mirror;
+      float tmp = *coord0;
+      *coord0 = *coord1;
+      *coord1 = tmp;
+   }
+}
+
+/**
+ * Adjust {src,dst}_x{0,1} to account for clipping and scissoring of
+ * destination coordinates.
+ *
+ * Return true if there is still blitting to do, false if all pixels got
+ * rejected by the clip and/or scissor.
+ *
+ * For clarity, the nomenclature of this function assumes we are clipping and
+ * scissoring the X coordinate; the exact same logic applies for Y
+ * coordinates.
+ *
+ * Note: this function may also be used to account for clipping of source
+ * coordinates, by swapping the roles of src and dst.
+ */
+static inline bool
+clip_or_scissor(bool mirror,
+                GLfloat *src_x0, GLfloat *src_x1,
+                GLfloat *dst_x0, GLfloat *dst_x1,
+                GLfloat fb_xmin, GLfloat fb_xmax)
+{
+   float scale = (float) (*src_x1 - *src_x0) / (*dst_x1 - *dst_x0);
+   /* If we are going to scissor everything away, stop. */
+   if (!(fb_xmin < fb_xmax &&
+         *dst_x0 < fb_xmax &&
+         fb_xmin < *dst_x1 &&
+         *dst_x0 < *dst_x1)) {
+      return false;
+   }
+
+   /* Clip the destination rectangle, and keep track of how many pixels we
+    * clipped off of the left and right sides of it.
+    */
+   int pixels_clipped_left = 0;
+   int pixels_clipped_right = 0;
+   if (*dst_x0 < fb_xmin) {
+      pixels_clipped_left = fb_xmin - *dst_x0;
+      *dst_x0 = fb_xmin;
+   }
+   if (fb_xmax < *dst_x1) {
+      pixels_clipped_right = *dst_x1 - fb_xmax;
+      *dst_x1 = fb_xmax;
+   }
+
+   /* If we are mirrored, then before applying pixels_clipped_{left,right} to
+    * the source coordinates, we need to flip them to account for the
+    * mirroring.
+    */
+   if (mirror) {
+      int tmp = pixels_clipped_left;
+      pixels_clipped_left = pixels_clipped_right;
+      pixels_clipped_right = tmp;
+   }
+
+   /* Adjust the source rectangle to remove the pixels corresponding to those
+    * that were clipped/scissored out of the destination rectangle.
+    */
+   *src_x0 += pixels_clipped_left * scale;
+   *src_x1 -= pixels_clipped_right * scale;
+
+   return true;
+}
+
+bool
+brw_meta_mirror_clip_and_scissor(const struct gl_context *ctx,
+                                 GLfloat *srcX0, GLfloat *srcY0,
+                                 GLfloat *srcX1, GLfloat *srcY1,
+                                 GLfloat *dstX0, GLfloat *dstY0,
+                                 GLfloat *dstX1, GLfloat *dstY1,
+                                 bool *mirror_x, bool *mirror_y)
+{
+   const struct gl_framebuffer *read_fb = ctx->ReadBuffer;
+   const struct gl_framebuffer *draw_fb = ctx->DrawBuffer;
+
+   *mirror_x = false;
+   *mirror_y = false;
+
+   /* Detect if the blit needs to be mirrored */
+   fixup_mirroring(mirror_x, srcX0, srcX1);
+   fixup_mirroring(mirror_x, dstX0, dstX1);
+   fixup_mirroring(mirror_y, srcY0, srcY1);
+   fixup_mirroring(mirror_y, dstY0, dstY1);
+
+   /* If the destination rectangle needs to be clipped or scissored, do so. */
+   if (!(clip_or_scissor(*mirror_x, srcX0, srcX1, dstX0, dstX1,
+                         draw_fb->_Xmin, draw_fb->_Xmax) &&
+         clip_or_scissor(*mirror_y, srcY0, srcY1, dstY0, dstY1,
+                         draw_fb->_Ymin, draw_fb->_Ymax))) {
+      /* Everything got clipped/scissored away, so the blit was successful. */
+      return true;
+   }
+
+   /* If the source rectangle needs to be clipped or scissored, do so. */
+   if (!(clip_or_scissor(*mirror_x, dstX0, dstX1, srcX0, srcX1,
+                         0, read_fb->Width) &&
+         clip_or_scissor(*mirror_y, dstY0, dstY1, srcY0, srcY1,
+                         0, read_fb->Height))) {
+      /* Everything got clipped/scissored away, so the blit was successful. */
+      return true;
+   }
+
+   /* Account for the fact that in the system framebuffer, the origin is at
+    * the lower left.
+    */
+   if (_mesa_is_winsys_fbo(read_fb)) {
+      GLint tmp = read_fb->Height - *srcY0;
+      *srcY0 = read_fb->Height - *srcY1;
+      *srcY1 = tmp;
+      *mirror_y = !*mirror_y;
+   }
+   if (_mesa_is_winsys_fbo(draw_fb)) {
+      GLint tmp = draw_fb->Height - *dstY0;
+      *dstY0 = draw_fb->Height - *dstY1;
+      *dstY1 = tmp;
+      *mirror_y = !*mirror_y;
+   }
+
+   return false;
+}
diff --git a/src/mesa/drivers/dri/i965/brw_meta_util.h b/src/mesa/drivers/dri/i965/brw_meta_util.h
new file mode 100644
index 0000000..ccd8642
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/brw_meta_util.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef BRW_META_UTIL_H
+#define BRW_META_UTIL_H
+
+#include <stdbool.h>
+#include "main/mtypes.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+brw_meta_mirror_clip_and_scissor(const struct gl_context *ctx,
+                                 GLfloat *srcX0, GLfloat *srcY0,
+                                 GLfloat *srcX1, GLfloat *srcY1,
+                                 GLfloat *dstX0, GLfloat *dstY0,
+                                 GLfloat *dstX1, GLfloat *dstY1,
+                                 bool *mirror_x, bool *mirror_y);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BRW_META_UTIL_H */