From: Marek Olšák <marek.ol...@amd.com>

Some ideas copied from Jakob Sinclair's implementation, but the color
clearing is completely different.

v2: remove leftover code, disable conditional rendering
---
 docs/GL3.txt                              |  2 +-
 docs/relnotes/12.1.0.html                 |  1 +
 src/gallium/drivers/r600/r600_blit.c      |  6 ++-
 src/gallium/drivers/r600/r600_pipe.c      |  2 +-
 src/gallium/drivers/radeon/r600_texture.c | 66 +++++++++++++++++++++++++++++++
 src/gallium/drivers/radeonsi/si_blit.c    |  6 ++-
 src/gallium/drivers/radeonsi/si_pipe.c    |  2 +-
 7 files changed, 80 insertions(+), 5 deletions(-)

diff --git a/docs/GL3.txt b/docs/GL3.txt
index c185c69..5dcfc31 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -185,21 +185,21 @@ GL 4.3, GLSL 4.30 -- all DONE: nvc0, radeonsi
   GL_ARB_texture_query_levels                           DONE (all drivers that 
support GLSL 1.30)
   GL_ARB_texture_storage_multisample                    DONE (all drivers that 
support GL_ARB_texture_multisample)
   GL_ARB_texture_view                                   DONE (i965, nv50, 
r600, llvmpipe, softpipe, swr)
   GL_ARB_vertex_attrib_binding                          DONE (all drivers)
 
 
 GL 4.4, GLSL 4.40:
 
   GL_MAX_VERTEX_ATTRIB_STRIDE                           DONE (all drivers)
   GL_ARB_buffer_storage                                 DONE (i965, nv50, 
nvc0, r600, radeonsi)
-  GL_ARB_clear_texture                                  DONE (i965, nv50, nvc0)
+  GL_ARB_clear_texture                                  DONE (i965, nv50, 
nvc0, r600, radeonsi)
   GL_ARB_enhanced_layouts                               DONE (i965)
   - compile-time constant expressions                   DONE
   - explicit byte offsets for blocks                    DONE
   - forced alignment within blocks                      DONE
   - specified vec4-slot component numbers               DONE (i965)
   - specified transform/feedback layout                 DONE
   - input/output block locations                        DONE
   GL_ARB_multi_bind                                     DONE (all drivers)
   GL_ARB_query_buffer_object                            DONE (i965/hsw+, nvc0)
   GL_ARB_texture_mirror_clamp_to_edge                   DONE (i965, nv50, 
nvc0, r600, radeonsi, llvmpipe, softpipe, swr)
diff --git a/docs/relnotes/12.1.0.html b/docs/relnotes/12.1.0.html
index 3935bb0..ed98d13 100644
--- a/docs/relnotes/12.1.0.html
+++ b/docs/relnotes/12.1.0.html
@@ -37,20 +37,21 @@ TBD.
 </pre>
 
 
 <h2>New features</h2>
 
 <p>
 Note: some of the new features are only available with certain drivers.
 </p>
 
 <ul>
+<li>GL_ARB_clear_texture on r600, radeonsi</li>
 <li>GL_ARB_enhanced_layouts on i965</li>
 <li>GL_ARB_shader_group_vote on nvc0</li>
 <li>GL_ARB_ES3_1_compatibility on i965</li>
 <li>GL_EXT_window_rectangles on nv50, nvc0</li>
 <li>GL_KHR_texture_compression_astc_sliced_3d on i965</li>
 </ul>
 
 <h2>Bug fixes</h2>
 
 TBD.
diff --git a/src/gallium/drivers/r600/r600_blit.c 
b/src/gallium/drivers/r600/r600_blit.c
index a6c5b44..8f2e2a6 100644
--- a/src/gallium/drivers/r600/r600_blit.c
+++ b/src/gallium/drivers/r600/r600_blit.c
@@ -29,21 +29,25 @@
 
 enum r600_blitter_op /* bitmask */
 {
        R600_SAVE_FRAGMENT_STATE = 1,
        R600_SAVE_TEXTURES       = 2,
        R600_SAVE_FRAMEBUFFER    = 4,
        R600_DISABLE_RENDER_COND = 8,
 
        R600_CLEAR         = R600_SAVE_FRAGMENT_STATE,
 
-       R600_CLEAR_SURFACE = R600_SAVE_FRAGMENT_STATE | R600_SAVE_FRAMEBUFFER,
+       /* GL_ARB_clear_texture should ignore the render condition, but
+        * Gallium shouldn't. Follow OpenGL.
+        */
+       R600_CLEAR_SURFACE = R600_SAVE_FRAGMENT_STATE | R600_SAVE_FRAMEBUFFER |
+                            R600_DISABLE_RENDER_COND,
 
        R600_COPY_BUFFER   = R600_DISABLE_RENDER_COND,
 
        R600_COPY_TEXTURE  = R600_SAVE_FRAGMENT_STATE | R600_SAVE_FRAMEBUFFER | 
R600_SAVE_TEXTURES |
                             R600_DISABLE_RENDER_COND,
 
        R600_BLIT          = R600_SAVE_FRAGMENT_STATE | R600_SAVE_FRAMEBUFFER | 
R600_SAVE_TEXTURES,
 
        R600_DECOMPRESS    = R600_SAVE_FRAGMENT_STATE | R600_SAVE_FRAMEBUFFER | 
R600_DISABLE_RENDER_COND,
 
diff --git a/src/gallium/drivers/r600/r600_pipe.c 
b/src/gallium/drivers/r600/r600_pipe.c
index 39a310a..5f69a5d 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -276,20 +276,21 @@ static int r600_get_param(struct pipe_screen* pscreen, 
enum pipe_cap param)
        case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
        case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
        case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
        case PIPE_CAP_TGSI_TXQS:
        case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
        case PIPE_CAP_INVALIDATE_BUFFER:
        case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
        case PIPE_CAP_QUERY_MEMORY_INFO:
        case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
        case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
+       case PIPE_CAP_CLEAR_TEXTURE:
                return 1;
 
        case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
                return rscreen->b.info.drm_major == 2 && 
rscreen->b.info.drm_minor >= 43;
 
        case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
                return !R600_BIG_ENDIAN && rscreen->b.info.has_userptr;
 
        case PIPE_CAP_COMPUTE:
                return rscreen->b.chip_class > R700;
@@ -348,21 +349,20 @@ static int r600_get_param(struct pipe_screen* pscreen, 
enum pipe_cap param)
        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
        case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
        case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
        case PIPE_CAP_VERTEX_COLOR_CLAMPED:
        case PIPE_CAP_USER_VERTEX_BUFFERS:
        case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
        case PIPE_CAP_VERTEXID_NOBASE:
        case PIPE_CAP_DEPTH_BOUNDS_TEST:
        case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
        case PIPE_CAP_SHAREABLE_SHADERS:
-       case PIPE_CAP_CLEAR_TEXTURE:
        case PIPE_CAP_DRAW_PARAMETERS:
        case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
        case PIPE_CAP_MULTI_DRAW_INDIRECT:
        case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
        case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
        case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
        case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
        case PIPE_CAP_GENERATE_MIPMAP:
        case PIPE_CAP_STRING_MARKER:
        case PIPE_CAP_QUERY_BUFFER_OBJECT:
diff --git a/src/gallium/drivers/radeon/r600_texture.c 
b/src/gallium/drivers/radeon/r600_texture.c
index f7c2f80..0b13f36 100644
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -23,20 +23,21 @@
  * Authors:
  *      Jerome Glisse
  *      Corbin Simpson
  */
 #include "r600_pipe_common.h"
 #include "r600_cs.h"
 #include "r600_query.h"
 #include "util/u_format.h"
 #include "util/u_memory.h"
 #include "util/u_pack_color.h"
+#include "util/u_surface.h"
 #include "os/os_time.h"
 #include <errno.h>
 #include <inttypes.h>
 
 static void r600_texture_discard_cmask(struct r600_common_screen *rscreen,
                                       struct r600_texture *rtex);
 static unsigned r600_choose_tiling(struct r600_common_screen *rscreen,
                                   const struct pipe_resource *templ);
 
 
@@ -1689,20 +1690,84 @@ static struct pipe_surface *r600_create_surface(struct 
pipe_context *pipe,
 static void r600_surface_destroy(struct pipe_context *pipe,
                                 struct pipe_surface *surface)
 {
        struct r600_surface *surf = (struct r600_surface*)surface;
        r600_resource_reference(&surf->cb_buffer_fmask, NULL);
        r600_resource_reference(&surf->cb_buffer_cmask, NULL);
        pipe_resource_reference(&surface->texture, NULL);
        FREE(surface);
 }
 
+static void r600_clear_texture(struct pipe_context *pipe,
+                              struct pipe_resource *tex,
+                              unsigned level,
+                              const struct pipe_box *box,
+                              const void *data)
+{
+       struct pipe_screen *screen = pipe->screen;
+       struct r600_texture *rtex = (struct r600_texture*)tex;
+       struct pipe_surface tmpl = {{0}}, *sf;
+       const struct util_format_description *desc =
+               util_format_description(tex->format);
+
+       tmpl.format = tex->format;
+       tmpl.u.tex.first_layer = box->z;
+       tmpl.u.tex.last_layer = box->z + box->depth - 1;
+       tmpl.u.tex.level = level;
+       sf = pipe->create_surface(pipe, tex, &tmpl);
+       if (!sf)
+               return;
+
+       if (rtex->is_depth) {
+               unsigned clear;
+               float depth;
+               uint8_t stencil = 0;
+
+               /* Depth is always present. */
+               clear = PIPE_CLEAR_DEPTH;
+               desc->unpack_z_float(&depth, 0, data, 0, 1, 1);
+
+               if (rtex->surface.flags & RADEON_SURF_SBUFFER) {
+                       clear |= PIPE_CLEAR_STENCIL;
+                       desc->unpack_s_8uint(&stencil, 0, data, 0, 1, 1);
+               }
+
+               pipe->clear_depth_stencil(pipe, sf, clear, depth, stencil,
+                                         box->x, box->y,
+                                         box->width, box->height);
+       } else {
+               union pipe_color_union color;
+
+               /* pipe_color_union requires the full vec4 representation. */
+               if (util_format_is_pure_uint(tex->format))
+                       desc->unpack_rgba_uint(color.ui, 0, data, 0, 1, 1);
+               else if (util_format_is_pure_sint(tex->format))
+                       desc->unpack_rgba_sint(color.i, 0, data, 0, 1, 1);
+               else
+                       desc->unpack_rgba_float(color.f, 0, data, 0, 1, 1);
+
+               if (screen->is_format_supported(screen, tex->format,
+                                               tex->target, 0,
+                                               PIPE_BIND_RENDER_TARGET)) {
+                       pipe->clear_render_target(pipe, sf, &color,
+                                                 box->x, box->y,
+                                                 box->width, box->height);
+               } else {
+                       /* Software fallback - just for R9G9B9E5_FLOAT */
+                       util_clear_render_target(pipe, sf, &color,
+                                                box->x, box->y,
+                                                box->width, box->height);
+               }
+       }
+       pipe_surface_reference(&sf, NULL);
+}
+
 unsigned r600_translate_colorswap(enum pipe_format format, bool do_endian_swap)
 {
        const struct util_format_description *desc = 
util_format_description(format);
 
 #define HAS_SWIZZLE(chan,swz) (desc->swizzle[chan] == PIPE_SWIZZLE_##swz)
 
        if (format == PIPE_FORMAT_R11G11B10_FLOAT) /* isn't plain */
                return V_0280A0_SWAP_STD;
 
        if (desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
@@ -2325,11 +2390,12 @@ void evergreen_do_fast_color_clear(struct 
r600_common_context *rctx,
 void r600_init_screen_texture_functions(struct r600_common_screen *rscreen)
 {
        rscreen->b.resource_from_handle = r600_texture_from_handle;
        rscreen->b.resource_get_handle = r600_texture_get_handle;
 }
 
 void r600_init_context_texture_functions(struct r600_common_context *rctx)
 {
        rctx->b.create_surface = r600_create_surface;
        rctx->b.surface_destroy = r600_surface_destroy;
+       rctx->b.clear_texture = r600_clear_texture;
 }
diff --git a/src/gallium/drivers/radeonsi/si_blit.c 
b/src/gallium/drivers/radeonsi/si_blit.c
index 38a19d5..6fcf0f0 100644
--- a/src/gallium/drivers/radeonsi/si_blit.c
+++ b/src/gallium/drivers/radeonsi/si_blit.c
@@ -28,21 +28,25 @@
 
 enum si_blitter_op /* bitmask */
 {
        SI_SAVE_TEXTURES      = 1,
        SI_SAVE_FRAMEBUFFER   = 2,
        SI_SAVE_FRAGMENT_STATE = 4,
        SI_DISABLE_RENDER_COND = 8,
 
        SI_CLEAR         = SI_SAVE_FRAGMENT_STATE,
 
-       SI_CLEAR_SURFACE = SI_SAVE_FRAMEBUFFER | SI_SAVE_FRAGMENT_STATE,
+       /* GL_ARB_clear_texture should ignore the render condition, but
+        * Gallium shouldn't. Follow OpenGL.
+        */
+       SI_CLEAR_SURFACE = SI_SAVE_FRAMEBUFFER | SI_SAVE_FRAGMENT_STATE |
+                          SI_DISABLE_RENDER_COND,
 
        SI_COPY          = SI_SAVE_FRAMEBUFFER | SI_SAVE_TEXTURES |
                           SI_SAVE_FRAGMENT_STATE | SI_DISABLE_RENDER_COND,
 
        SI_BLIT          = SI_SAVE_FRAMEBUFFER | SI_SAVE_TEXTURES |
                           SI_SAVE_FRAGMENT_STATE,
 
        SI_DECOMPRESS    = SI_SAVE_FRAMEBUFFER | SI_SAVE_FRAGMENT_STATE |
                           SI_DISABLE_RENDER_COND,
 
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c 
b/src/gallium/drivers/radeonsi/si_pipe.c
index e33823d..c1c2a9a 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -379,20 +379,21 @@ static int si_get_param(struct pipe_screen* pscreen, enum 
pipe_cap param)
        case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
        case PIPE_CAP_INVALIDATE_BUFFER:
        case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
        case PIPE_CAP_QUERY_MEMORY_INFO:
        case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
        case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
        case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
        case PIPE_CAP_GENERATE_MIPMAP:
        case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
        case PIPE_CAP_STRING_MARKER:
+       case PIPE_CAP_CLEAR_TEXTURE:
                return 1;
 
        case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
                return !SI_BIG_ENDIAN && sscreen->b.info.has_userptr;
 
        case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
                return (sscreen->b.info.drm_major == 2 &&
                        sscreen->b.info.drm_minor >= 43) ||
                       sscreen->b.info.drm_major == 3;
 
@@ -427,21 +428,20 @@ static int si_get_param(struct pipe_screen* pscreen, enum 
pipe_cap param)
        case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
                return 0;
 
        /* Unsupported features. */
        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
        case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
        case PIPE_CAP_USER_VERTEX_BUFFERS:
        case PIPE_CAP_FAKE_SW_MSAA:
        case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
        case PIPE_CAP_VERTEXID_NOBASE:
-       case PIPE_CAP_CLEAR_TEXTURE:
        case PIPE_CAP_DRAW_PARAMETERS:
        case PIPE_CAP_MULTI_DRAW_INDIRECT:
        case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
        case PIPE_CAP_QUERY_BUFFER_OBJECT:
        case PIPE_CAP_CULL_DISTANCE:
        case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
        case PIPE_CAP_TGSI_VOTE:
        case PIPE_CAP_MAX_WINDOW_RECTANGLES:
                return 0;
 
-- 
2.7.4

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