vl: add a bicubic interpolation filter(v5)

This is a shader based bicubic interpolater which uses cubic
Hermite spline algorithm.

v2: set dst_area and dst_clip during scaling (Christian)
v3: clear the render target before rendering
v4: intialize offsets while initializing shaders
    use a constant buffer to send dst_size to frag shader
    small changes to reduce calculation in shader
v5: send half pixel offset instead of sending dst_size

Signed-off-by: Nayan Deshmukh <[email protected]>
Reviewed-by: Christian König <[email protected]>

3 files changed, 528 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index ab58358a1a3..e0311bfc3a1 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -317,6 +317,8 @@ NIR_SOURCES := \
 	nir/tgsi_to_nir.h
 
 VL_SOURCES := \
+	vl/vl_bicubic_filter.c \
+	vl/vl_bicubic_filter.h \
 	vl/vl_compositor.c \
 	vl/vl_compositor.h \
 	vl/vl_csc.c \
diff --git a/src/gallium/auxiliary/vl/vl_bicubic_filter.c b/src/gallium/auxiliary/vl/vl_bicubic_filter.c
new file mode 100644
index 00000000000..ca9f8820e3b
--- /dev/null
+++ b/src/gallium/auxiliary/vl/vl_bicubic_filter.c
@@ -0,0 +1,463 @@
+/**************************************************************************
+ *
+ * Copyright 2016 Nayan Deshmukh.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 <stdio.h>
+
+#include "pipe/p_context.h"
+
+#include "tgsi/tgsi_ureg.h"
+
+#include "util/u_draw.h"
+#include "util/u_memory.h"
+#include "util/u_math.h"
+#include "util/u_rect.h"
+
+#include "vl_types.h"
+#include "vl_vertex_buffers.h"
+#include "vl_bicubic_filter.h"
+
+enum VS_OUTPUT
+{
+   VS_O_VPOS = 0,
+   VS_O_VTEX = 0
+};
+
+static void *
+create_vert_shader(struct vl_bicubic_filter *filter)
+{
+   struct ureg_program *shader;
+   struct ureg_src i_vpos;
+   struct ureg_dst o_vpos, o_vtex;
+
+   shader = ureg_create(PIPE_SHADER_VERTEX);
+   if (!shader)
+      return NULL;
+
+   i_vpos = ureg_DECL_vs_input(shader, 0);
+   o_vpos = ureg_DECL_output(shader, TGSI_SEMANTIC_POSITION, VS_O_VPOS);
+   o_vtex = ureg_DECL_output(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX);
+
+   ureg_MOV(shader, o_vpos, i_vpos);
+   ureg_MOV(shader, o_vtex, i_vpos);
+
+   ureg_END(shader);
+
+   return ureg_create_shader_and_destroy(shader, filter->pipe);
+}
+
+static void
+create_frag_shader_cubic_interpolater(struct ureg_program *shader, struct ureg_src tex_a,
+                                      struct ureg_src tex_b, struct ureg_src tex_c,
+                                      struct ureg_src tex_d, struct ureg_src t,
+                                      struct ureg_dst o_fragment)
+{
+   struct ureg_dst temp[11];
+   struct ureg_dst t_2;
+   unsigned i;
+
+   for(i = 0; i < 11; ++i)
+       temp[i] = ureg_DECL_temporary(shader);
+   t_2 = ureg_DECL_temporary(shader);
+
+   /*
+    * |temp[0]|   |  0  2  0  0 |  |tex_a|
+    * |temp[1]| = | -1  0  1  0 |* |tex_b|
+    * |temp[2]|   |  2 -5  4 -1 |  |tex_c|
+    * |temp[3]|   | -1  3 -3  1 |  |tex_d|
+    */
+   ureg_MUL(shader, temp[0], tex_b, ureg_imm1f(shader, 2.0f));
+
+   ureg_MUL(shader, temp[1], tex_a, ureg_imm1f(shader, -1.0f));
+   ureg_MAD(shader, temp[1], tex_c, ureg_imm1f(shader, 1.0f),
+            ureg_src(temp[1]));
+
+   ureg_MUL(shader, temp[2], tex_a, ureg_imm1f(shader, 2.0f));
+   ureg_MAD(shader, temp[2], tex_b, ureg_imm1f(shader, -5.0f),
+            ureg_src(temp[2]));
+   ureg_MAD(shader, temp[2], tex_c, ureg_imm1f(shader, 4.0f),
+            ureg_src(temp[2]));
+   ureg_MAD(shader, temp[2], tex_d, ureg_imm1f(shader, -1.0f),
+             ureg_src(temp[2]));
+
+   ureg_MUL(shader, temp[3], tex_a, ureg_imm1f(shader, -1.0f));
+   ureg_MAD(shader, temp[3], tex_b, ureg_imm1f(shader, 3.0f),
+            ureg_src(temp[3]));
+   ureg_MAD(shader, temp[3], tex_c, ureg_imm1f(shader, -3.0f),
+            ureg_src(temp[3]));
+   ureg_MAD(shader, temp[3], tex_d, ureg_imm1f(shader, 1.0f),
+            ureg_src(temp[3]));
+
+   /*
+    * t_2 = t*t
+    * o_fragment = 0.5*|1  t  t^2  t^3|*|temp[0]|
+    *                                   |temp[1]|
+    *                                   |temp[2]|
+    *                                   |temp[3]|
+    */
+
+   ureg_MUL(shader, t_2, t, t);
+   ureg_MUL(shader, temp[4], ureg_src(t_2), t);
+
+   ureg_MUL(shader, temp[4], ureg_src(temp[4]),
+            ureg_src(temp[3]));
+   ureg_MUL(shader, temp[5], ureg_src(t_2),
+            ureg_src(temp[2]));
+   ureg_MUL(shader, temp[6], t,
+            ureg_src(temp[1]));
+   ureg_MUL(shader, temp[7], ureg_imm1f(shader, 1.0f),
+            ureg_src(temp[0]));
+   ureg_ADD(shader, temp[8], ureg_src(temp[4]),
+            ureg_src(temp[5]));
+   ureg_ADD(shader, temp[9], ureg_src(temp[6]),
+            ureg_src(temp[7]));
+
+   ureg_ADD(shader, temp[10], ureg_src(temp[8]),
+            ureg_src(temp[9]));
+   ureg_MUL(shader, o_fragment, ureg_src(temp[10]),
+            ureg_imm1f(shader, 0.5f));
+
+
+   for(i = 0; i < 11; ++i)
+       ureg_release_temporary(shader, temp[i]);
+   ureg_release_temporary(shader, t_2);
+}
+
+static void *
+create_frag_shader(struct vl_bicubic_filter *filter, unsigned video_width,
+                   unsigned video_height, struct vertex2f *offsets)
+{
+   struct pipe_screen *screen = filter->pipe->screen;
+   struct ureg_program *shader;
+   struct ureg_src i_vtex, vtex;
+   struct ureg_src sampler;
+   struct ureg_src half_pixel;
+   struct ureg_dst t_array[23];
+   struct ureg_dst o_fragment;
+   struct ureg_dst t;
+   unsigned i;
+
+   if (screen->get_shader_param(
+      screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_TEMPS) < 23) {
+
+      return NULL;
+   }
+
+   shader = ureg_create(PIPE_SHADER_FRAGMENT);
+   if (!shader) {
+      return NULL;
+   }
+
+   i_vtex = ureg_DECL_fs_input(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX, TGSI_INTERPOLATE_LINEAR);
+   sampler = ureg_DECL_sampler(shader, 0);
+
+   for (i = 0; i < 23; ++i)
+      t_array[i] = ureg_DECL_temporary(shader);
+   t = ureg_DECL_temporary(shader);
+
+   half_pixel = ureg_DECL_constant(shader, 0);
+   o_fragment = ureg_DECL_output(shader, TGSI_SEMANTIC_COLOR, 0);
+
+   /*
+    * temp = (i_vtex - (0.5/dst_size)) * i_size)
+    * t = frac(temp)
+    * vtex = floor(i_vtex)/i_size
+    */
+   ureg_SUB(shader, ureg_writemask(t_array[21], TGSI_WRITEMASK_XY),
+            i_vtex, half_pixel);
+   ureg_MUL(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
+            ureg_src(t_array[21]), ureg_imm2f(shader, video_width, video_height));
+   ureg_FRC(shader, ureg_writemask(t, TGSI_WRITEMASK_XY),
+            ureg_src(t_array[22]));
+
+   ureg_FLR(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
+            ureg_src(t_array[22]));
+   ureg_DIV(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
+            ureg_src(t_array[22]), ureg_imm2f(shader, video_width, video_height));
+
+   /*
+    * t_array[0..*] = vtex + offset[0..*]
+    * t_array[0..*] = tex(t_array[0..*], sampler)
+    * t_array[16+i] = cubic_interpolate(t_array[4*i..4*i+3], t_x)
+    * o_fragment = cubic_interpolate(t_array[16..19], t_y)
+    */
+   vtex = ureg_src(t_array[22]);
+   for (i = 0; i < 16; ++i) {
+        ureg_ADD(shader, ureg_writemask(t_array[i], TGSI_WRITEMASK_XY),
+                  vtex, ureg_imm2f(shader, offsets[i].x, offsets[i].y));
+        ureg_MOV(shader, ureg_writemask(t_array[i], TGSI_WRITEMASK_ZW),
+                  ureg_imm1f(shader, 0.0f));
+   }
+
+   for (i = 0; i < 16; ++i) {
+      ureg_TEX(shader, t_array[i], TGSI_TEXTURE_2D, ureg_src(t_array[i]), sampler);
+   }
+
+   for(i = 0; i < 4; ++i)
+      create_frag_shader_cubic_interpolater(shader, ureg_src(t_array[4*i]),
+              ureg_src(t_array[4*i+1]), ureg_src(t_array[4*i+2]), ureg_src(t_array[4*i+3]),
+              ureg_scalar(ureg_src(t), TGSI_SWIZZLE_X), t_array[16+i]);
+
+   create_frag_shader_cubic_interpolater(shader, ureg_src(t_array[16]),
+            ureg_src(t_array[17]), ureg_src(t_array[18]), ureg_src(t_array[19]),
+            ureg_scalar(ureg_src(t), TGSI_SWIZZLE_Y), o_fragment);
+
+   for(i = 0; i < 23; ++i)
+       ureg_release_temporary(shader, t_array[i]);
+   ureg_release_temporary(shader, t);
+
+   ureg_END(shader);
+
+   return ureg_create_shader_and_destroy(shader, filter->pipe);
+}
+
+bool
+vl_bicubic_filter_init(struct vl_bicubic_filter *filter, struct pipe_context *pipe,
+                      unsigned width, unsigned height)
+{
+   struct pipe_rasterizer_state rs_state;
+   struct pipe_blend_state blend;
+   struct vertex2f *offsets = NULL;
+   struct pipe_sampler_state sampler;
+   struct pipe_vertex_element ve;
+   unsigned i;
+
+   assert(filter && pipe);
+   assert(width && height);
+
+   memset(filter, 0, sizeof(*filter));
+   filter->pipe = pipe;
+
+   memset(&rs_state, 0, sizeof(rs_state));
+   rs_state.half_pixel_center = true;
+   rs_state.bottom_edge_rule = true;
+   rs_state.depth_clip = 1;
+   filter->rs_state = pipe->create_rasterizer_state(pipe, &rs_state);
+   if (!filter->rs_state)
+      goto error_rs_state;
+
+   memset(&blend, 0, sizeof blend);
+   blend.rt[0].rgb_func = PIPE_BLEND_ADD;
+   blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
+   blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
+   blend.rt[0].alpha_func = PIPE_BLEND_ADD;
+   blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
+   blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
+   blend.logicop_func = PIPE_LOGICOP_CLEAR;
+   blend.rt[0].colormask = PIPE_MASK_RGBA;
+   filter->blend = pipe->create_blend_state(pipe, &blend);
+   if (!filter->blend)
+      goto error_blend;
+
+   memset(&sampler, 0, sizeof(sampler));
+   sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
+   sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
+   sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
+   sampler.compare_mode = PIPE_TEX_COMPARE_NONE;
+   sampler.compare_func = PIPE_FUNC_ALWAYS;
+   sampler.normalized_coords = 1;
+   filter->sampler = pipe->create_sampler_state(pipe, &sampler);
+   if (!filter->sampler)
+      goto error_sampler;
+
+   filter->quad = vl_vb_upload_quads(pipe);
+   if(!filter->quad.buffer)
+      goto error_quad;
+
+   memset(&ve, 0, sizeof(ve));
+   ve.src_offset = 0;
+   ve.instance_divisor = 0;
+   ve.vertex_buffer_index = 0;
+   ve.src_format = PIPE_FORMAT_R32G32_FLOAT;
+   filter->ves = pipe->create_vertex_elements_state(pipe, 1, &ve);
+   if (!filter->ves)
+      goto error_ves;
+
+   offsets = MALLOC(sizeof(struct vertex2f) * 16);
+   if (!offsets)
+      goto error_offsets;
+
+   offsets[0].x = -1.0f; offsets[0].y = -1.0f;
+   offsets[1].x = 0.0f; offsets[1].y = -1.0f;
+   offsets[2].x = 1.0f; offsets[2].y = -1.0f;
+   offsets[3].x = 2.0f; offsets[3].y = -1.0f;
+
+   offsets[4].x = -1.0f; offsets[4].y = 0.0f;
+   offsets[5].x = 0.0f; offsets[5].y = 0.0f;
+   offsets[6].x = 1.0f; offsets[6].y = 0.0f;
+   offsets[7].x = 2.0f; offsets[7].y = 0.0f;
+
+   offsets[8].x = -1.0f; offsets[8].y = 1.0f;
+   offsets[9].x = 0.0f; offsets[9].y = 1.0f;
+   offsets[10].x = 1.0f; offsets[10].y = 1.0f;
+   offsets[11].x = 2.0f; offsets[11].y = 1.0f;
+
+   offsets[12].x = -1.0f; offsets[12].y = 2.0f;
+   offsets[13].x = 0.0f; offsets[13].y = 2.0f;
+   offsets[14].x = 1.0f; offsets[14].y = 2.0f;
+   offsets[15].x = 2.0f; offsets[15].y = 2.0f;
+
+   for (i = 0; i < 16; ++i) {
+      offsets[i].x /= width;
+      offsets[i].y /= height;
+   }
+
+   filter->vs = create_vert_shader(filter);
+   if (!filter->vs)
+      goto error_vs;
+
+   filter->fs = create_frag_shader(filter, width, height, offsets);
+   if (!filter->fs)
+      goto error_fs;
+
+   return true;
+
+error_fs:
+   pipe->delete_vs_state(pipe, filter->vs);
+
+error_vs:
+
+error_offsets:
+   pipe->delete_vertex_elements_state(pipe, filter->ves);
+
+error_ves:
+   pipe_resource_reference(&filter->quad.buffer, NULL);
+
+error_quad:
+   pipe->delete_sampler_state(pipe, filter->sampler);
+
+error_sampler:
+   pipe->delete_blend_state(pipe, filter->blend);
+
+error_blend:
+   pipe->delete_rasterizer_state(pipe, filter->rs_state);
+
+error_rs_state:
+   return false;
+}
+
+void
+vl_bicubic_filter_cleanup(struct vl_bicubic_filter *filter)
+{
+   assert(filter);
+
+   filter->pipe->delete_sampler_state(filter->pipe, filter->sampler);
+   filter->pipe->delete_blend_state(filter->pipe, filter->blend);
+   filter->pipe->delete_rasterizer_state(filter->pipe, filter->rs_state);
+   filter->pipe->delete_vertex_elements_state(filter->pipe, filter->ves);
+   pipe_resource_reference(&filter->quad.buffer, NULL);
+
+   filter->pipe->delete_vs_state(filter->pipe, filter->vs);
+   filter->pipe->delete_fs_state(filter->pipe, filter->fs);
+}
+
+void
+vl_bicubic_filter_render(struct vl_bicubic_filter *filter,
+                        struct pipe_sampler_view *src,
+                        struct pipe_surface *dst,
+                        struct u_rect *dst_area,
+                        struct u_rect *dst_clip)
+{
+   struct pipe_viewport_state viewport;
+   struct pipe_framebuffer_state fb_state;
+   struct pipe_scissor_state scissor;
+   union pipe_color_union clear_color;
+   struct pipe_transfer *buf_transfer;
+   struct pipe_resource *surface_size;
+   assert(filter && src && dst);
+
+   if (dst_clip) {
+      scissor.minx = dst_clip->x0;
+      scissor.miny = dst_clip->y0;
+      scissor.maxx = dst_clip->x1;
+      scissor.maxy = dst_clip->y1;
+   } else {
+      scissor.minx = 0;
+      scissor.miny = 0;
+      scissor.maxx = dst->width;
+      scissor.maxy = dst->height;
+   }
+
+   clear_color.f[0] = clear_color.f[1] = 0.0f;
+   clear_color.f[2] = clear_color.f[3] = 0.0f;
+   surface_size = pipe_buffer_create
+   (
+      filter->pipe->screen,
+      PIPE_BIND_CONSTANT_BUFFER,
+      PIPE_USAGE_DEFAULT,
+      2*sizeof(float)
+   );
+
+
+   memset(&viewport, 0, sizeof(viewport));
+   if(dst_area){
+      viewport.scale[0] = dst_area->x1 - dst_area->x0;
+      viewport.scale[1] = dst_area->y1 - dst_area->y0;
+      viewport.translate[0] = dst_area->x0;
+      viewport.translate[1] = dst_area->y0;
+   } else {
+      viewport.scale[0] = dst->width;
+      viewport.scale[1] = dst->height;
+   }
+   viewport.scale[2] = 1;
+
+   float *ptr = pipe_buffer_map(filter->pipe, surface_size,
+                               PIPE_TRANSFER_WRITE | PIPE_TRANSFER_DISCARD_RANGE,
+                               &buf_transfer);
+
+   ptr[0] = 0.5f/viewport.scale[0];
+   ptr[1] = 0.5f/viewport.scale[1];
+
+   pipe_buffer_unmap(filter->pipe, buf_transfer);
+
+   memset(&fb_state, 0, sizeof(fb_state));
+   fb_state.width = dst->width;
+   fb_state.height = dst->height;
+   fb_state.nr_cbufs = 1;
+   fb_state.cbufs[0] = dst;
+
+   filter->pipe->set_scissor_states(filter->pipe, 0, 1, &scissor);
+   filter->pipe->clear_render_target(filter->pipe, dst, &clear_color,
+                                     0, 0, dst->width, dst->height);
+   pipe_set_constant_buffer(filter->pipe, PIPE_SHADER_FRAGMENT, 0, surface_size);
+   filter->pipe->bind_rasterizer_state(filter->pipe, filter->rs_state);
+   filter->pipe->bind_blend_state(filter->pipe, filter->blend);
+   filter->pipe->bind_sampler_states(filter->pipe, PIPE_SHADER_FRAGMENT,
+                                     0, 1, &filter->sampler);
+   filter->pipe->set_sampler_views(filter->pipe, PIPE_SHADER_FRAGMENT,
+                                   0, 1, &src);
+   filter->pipe->bind_vs_state(filter->pipe, filter->vs);
+   filter->pipe->bind_fs_state(filter->pipe, filter->fs);
+   filter->pipe->set_framebuffer_state(filter->pipe, &fb_state);
+   filter->pipe->set_viewport_states(filter->pipe, 0, 1, &viewport);
+   filter->pipe->set_vertex_buffers(filter->pipe, 0, 1, &filter->quad);
+   filter->pipe->bind_vertex_elements_state(filter->pipe, filter->ves);
+
+   util_draw_arrays(filter->pipe, PIPE_PRIM_QUADS, 0, 4);
+}
diff --git a/src/gallium/auxiliary/vl/vl_bicubic_filter.h b/src/gallium/auxiliary/vl/vl_bicubic_filter.h
new file mode 100644
index 00000000000..e5bef474e50
--- /dev/null
+++ b/src/gallium/auxiliary/vl/vl_bicubic_filter.h
@@ -0,0 +1,63 @@
+/**************************************************************************
+ *
+ * Copyright 2016 Nayan Deshmukh.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+/* implementation of bicubic interpolation filters */
+
+#ifndef vl_bicubic_filter_h
+#define vl_bicubic_filter_h
+
+#include "pipe/p_state.h"
+
+struct vl_bicubic_filter
+{
+   struct pipe_context *pipe;
+   struct pipe_vertex_buffer quad;
+
+   void *rs_state;
+   void *blend;
+   void *sampler;
+   void *ves;
+   void *vs, *fs;
+};
+
+bool
+vl_bicubic_filter_init(struct vl_bicubic_filter *filter, struct pipe_context *pipe,
+                      unsigned width, unsigned height);
+
+void
+vl_bicubic_filter_cleanup(struct vl_bicubic_filter *filter);
+
+
+void
+vl_bicubic_filter_render(struct vl_bicubic_filter *filter,
+                        struct pipe_sampler_view *src,
+                        struct pipe_surface *dst,
+                        struct u_rect *dst_area,
+                        struct u_rect *dst_clip);
+
+
+#endif /* vl_bicubic_filter_h */