[Mesa-dev] [PATCH v2 1/2] vl: add a lanczos interpolation filter v2

Nayan Deshmukh nayan26deshmukh at gmail.com
Wed Jul 20 12:02:53 UTC 2016


Hi Christian,

Thanks for the review.


On Tue, Jul 19, 2016 at 4:58 PM, Christian K├Ânig <deathsimple at vodafone.de>
wrote:

> Am 18.07.2016 um 21:55 schrieb Nayan Deshmukh:
>
>> v2: avoiding dividing by zero when calculating lanczos
>>
>> Signed-off-by: Nayan Deshmukh <nayan26deshmukh at gmail.com>
>>
>
> That looks much better, but there are still quite a bunch of artifacts.
>
> Take a look at the attached screenshots. good.jpg was created with
> hqscalling=0, bad with hqscalling=7.
>
> Especially on the left side we have lines from top to bottom where there
> shouldn't be any.
>
> Regards,
> Christian.
>
>
> ---
>>   src/gallium/auxiliary/Makefile.sources       |   2 +
>>   src/gallium/auxiliary/vl/vl_lanczos_filter.c | 447
>> +++++++++++++++++++++++++++
>>   src/gallium/auxiliary/vl/vl_lanczos_filter.h |  63 ++++
>>   3 files changed, 512 insertions(+)
>>   create mode 100644 src/gallium/auxiliary/vl/vl_lanczos_filter.c
>>   create mode 100644 src/gallium/auxiliary/vl/vl_lanczos_filter.h
>>
>> diff --git a/src/gallium/auxiliary/Makefile.sources
>> b/src/gallium/auxiliary/Makefile.sources
>> index e0311bf..4eb0f65 100644
>> --- a/src/gallium/auxiliary/Makefile.sources
>> +++ b/src/gallium/auxiliary/Makefile.sources
>> @@ -330,6 +330,8 @@ VL_SOURCES := \
>>         vl/vl_deint_filter.h \
>>         vl/vl_idct.c \
>>         vl/vl_idct.h \
>> +       vl/vl_lanczos_filter.c \
>> +       vl/vl_lanczos_filter.h \
>>         vl/vl_matrix_filter.c \
>>         vl/vl_matrix_filter.h \
>>         vl/vl_mc.c \
>> diff --git a/src/gallium/auxiliary/vl/vl_lanczos_filter.c
>> b/src/gallium/auxiliary/vl/vl_lanczos_filter.c
>> new file mode 100644
>> index 0000000..7c69555
>> --- /dev/null
>> +++ b/src/gallium/auxiliary/vl/vl_lanczos_filter.c
>> @@ -0,0 +1,447 @@
>>
>> +/**************************************************************************
>> + *
>> + * 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_lanczos_filter.h"
>> +
>> +enum VS_OUTPUT
>> +{
>> +   VS_O_VPOS = 0,
>> +   VS_O_VTEX = 0
>> +};
>> +
>> +static void *
>> +create_vert_shader(struct vl_lanczos_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_lanczos(struct ureg_program *shader, struct ureg_src
>> a,
>> +                           struct ureg_src x, struct ureg_dst o_fragment)
>> +{
>> +   struct ureg_dst temp[8];
>> +   unsigned i;
>> +
>> +   for(i = 0; i < 8; ++i)
>> +       temp[i] = ureg_DECL_temporary(shader);
>> +
>> +   /*
>> +    * temp[0] = (x == 0) ? 1.0f : x
>> +    * temp[7] = (sin(pi * x) * sin ((pi * x)/a)) / x^2
>> +    * o_fragment = (x == 0) ? 1.0f : temp[7]
>> +    */
>> +   ureg_MOV(shader, temp[0], x);
>> +   ureg_SEQ(shader, temp[1], x, ureg_imm1f(shader, 0.0f));
>> +
>> +   ureg_LRP(shader, temp[0], ureg_src(temp[1]),
>> +            ureg_imm1f(shader, 1.0f), ureg_src(temp[0]));
>> +
>> +   ureg_MUL(shader, temp[2], x,
>> +            ureg_imm1f(shader, 3.141592));
>> +   ureg_DIV(shader, temp[3], ureg_src(temp[2]), a);
>> +
>> +   ureg_SIN(shader, temp[4], ureg_src(temp[2]));
>> +   ureg_SIN(shader, temp[5], ureg_src(temp[3]));
>> +
>> +   ureg_MUL(shader, temp[6], ureg_src(temp[4]),
>> +            ureg_src(temp[5]));
>> +   ureg_MUL(shader, temp[7], ureg_imm1f(shader,
>> +            0.101321), a);
>> +   ureg_MUL(shader, temp[7], ureg_src(temp[7]),
>> +            ureg_src(temp[6]));
>> +   ureg_DIV(shader, temp[7], ureg_src(temp[7]),
>> +            ureg_src(temp[0]));
>> +   ureg_DIV(shader, o_fragment,
>> +           ureg_src(temp[7]), ureg_src(temp[0]));
>> +
>> +   ureg_LRP(shader, o_fragment, ureg_src(temp[1]),
>> +            ureg_imm1f(shader, 1.0f), ureg_src(o_fragment));
>> +
>> +   for(i = 0; i < 8; ++i)
>> +       ureg_release_temporary(shader, temp[i]);
>> +}
>> +
>> +static void *
>> +create_frag_shader(struct vl_lanczos_filter *filter, unsigned
>> num_offsets,
>> +                   struct vertex2f *offsets, unsigned a,
>> +                   unsigned video_width, unsigned video_height)
>> +{
>> +   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 o_fragment;
>> +   struct ureg_dst *t_array = MALLOC(sizeof(struct ureg_dst) *
>> (num_offsets + 2));
>> +   struct ureg_dst x, t_sum;
>> +   unsigned i;
>> +   bool first;
>> +
>> +   if (screen->get_shader_param(
>> +      screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_TEMPS) <
>> num_offsets + 2) {
>> +      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 < num_offsets + 2; ++i)
>> +      t_array[i] = ureg_DECL_temporary(shader);
>> +   x = 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)
>> +    * x = frac(temp)
>> +    * vtex = floor(i_vtex)/i_size + half_pixel
>> +    */
>>
>
This seems to be the reason for the artifacts.


> +   ureg_SUB(shader, ureg_writemask(t_array[0], TGSI_WRITEMASK_XY),
>> +            i_vtex, half_pixel);
>>
>
On debugging I found that after removing this ^^^ instruction the artifacts
are gone.
Not sure why is this happening but the filter is working fine.

Any ideas Christian?

Regards,
Nayan.

> +   ureg_MUL(shader, ureg_writemask(t_array[1], TGSI_WRITEMASK_XY),
>> +            ureg_src(t_array[0]), ureg_imm2f(shader, video_width,
>> video_height));
>> +   ureg_FRC(shader, ureg_writemask(x, TGSI_WRITEMASK_XY),
>> +            ureg_src(t_array[1]));
>> +
>> +   ureg_FLR(shader, ureg_writemask(t_array[1], TGSI_WRITEMASK_XY),
>> +            ureg_src(t_array[1]));
>> +   ureg_DIV(shader, ureg_writemask(t_array[1], TGSI_WRITEMASK_XY),
>> +            ureg_src(t_array[1]), ureg_imm2f(shader, video_width,
>> video_height));
>> +   ureg_ADD(shader, ureg_writemask(t_array[1], TGSI_WRITEMASK_XY),
>> +            ureg_src(t_array[1]), half_pixel);
>> +   /*
>> +    * t_array[2..*] = vtex + offset[0..*]
>> +    * t_array[2..*] = tex(t_array[0..*], sampler)
>> +    * o_fragment = sum(t_array[i] * lanczos(x - offsets[i].x) *
>> lanczos(y - offsets[i].y))
>> +    */
>> +   vtex = ureg_src(t_array[1]);
>> +   for (i = 0; i < num_offsets; ++i) {
>> +        ureg_ADD(shader, ureg_writemask(t_array[i + 2],
>> TGSI_WRITEMASK_XY),
>> +                  vtex, ureg_imm2f(shader, offsets[i].x, offsets[i].y));
>> +        ureg_MOV(shader, ureg_writemask(t_array[i + 2],
>> TGSI_WRITEMASK_ZW),
>> +                  ureg_imm1f(shader, 0.0f));
>> +   }
>> +
>> +   for (i = 0; i < num_offsets; ++i) {
>> +      ureg_TEX(shader, t_array[i + 2], TGSI_TEXTURE_2D,
>> ureg_src(t_array[i + 2]), sampler);
>> +   }
>> +
>> +   for(i = 0, first = true; i < num_offsets; ++i) {
>> +      if (first) {
>> +         t_sum = t_array[i + 2];
>> +         ureg_SUB(shader, ureg_writemask(t_array[i], TGSI_WRITEMASK_XY),
>> +                  ureg_src(x), ureg_imm2f(shader, offsets[i].x *
>> video_width,
>> +                  offsets[i].y * video_height));
>> +         create_frag_shader_lanczos(shader, ureg_imm1f(shader,
>> (float)(a)),
>> +                 ureg_scalar(ureg_src(t_array[i]), TGSI_SWIZZLE_X),
>> t_array[i + 1]);
>> +         create_frag_shader_lanczos(shader, ureg_imm1f(shader,
>> (float)(a)),
>> +                 ureg_scalar(ureg_src(t_array[i]), TGSI_SWIZZLE_Y),
>> t_array[i]);
>> +         ureg_MUL(shader, t_array[i + 1], ureg_src(t_array[i + 1]),
>> +                  ureg_src(t_array[i]));
>> +         ureg_MUL(shader, t_sum, ureg_src(t_array[i + 2]),
>> +                  ureg_src(t_array[i + 1]));
>> +         first = false;
>> +      } else {
>> +         ureg_SUB(shader, ureg_writemask(t_array[i], TGSI_WRITEMASK_XY),
>> +                  ureg_src(x), ureg_imm2f(shader, offsets[i].x *
>> video_width,
>> +                  offsets[i].y * video_height));
>> +         create_frag_shader_lanczos(shader, ureg_imm1f(shader,
>> (float)(a)),
>> +                 ureg_scalar(ureg_src(t_array[i]), TGSI_SWIZZLE_X),
>> t_array[i + 1]);
>> +         create_frag_shader_lanczos(shader, ureg_imm1f(shader,
>> (float)(a)),
>> +                 ureg_scalar(ureg_src(t_array[i]), TGSI_SWIZZLE_Y),
>> t_array[i]);
>> +         ureg_MUL(shader, t_array[i + 1], ureg_src(t_array[i + 1]),
>> +                  ureg_src(t_array[i]));
>> +         ureg_MAD(shader, t_sum, ureg_src(t_array[i + 2]),
>> +                  ureg_src(t_array[i + 1]), ureg_src(t_sum));
>> +      }
>> +   }
>> +
>> +   if (first)
>> +      ureg_MOV(shader, o_fragment, ureg_imm1f(shader, 0.0f));
>> +   else
>> +      ureg_MOV(shader, o_fragment, ureg_src(t_sum));
>> +
>> +   ureg_release_temporary(shader, x);
>> +   ureg_END(shader);
>> +
>> +   FREE(t_array);
>> +   return ureg_create_shader_and_destroy(shader, filter->pipe);
>> +}
>> +
>> +bool
>> +vl_lanczos_filter_init(struct vl_lanczos_filter *filter, struct
>> pipe_context *pipe,
>> +                       unsigned size, unsigned width, unsigned height)
>> +{
>> +   struct pipe_rasterizer_state rs_state;
>> +   struct pipe_blend_state blend;
>> +   struct vertex2f *offsets, v, sizes;
>> +   struct pipe_sampler_state sampler;
>> +   struct pipe_vertex_element ve;
>> +   unsigned i, num_offsets = (2 * size) * (2 * size);
>> +
>> +   assert(filter && pipe);
>> +   assert(width && height);
>> +   assert(size);
>> +
>> +   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) * num_offsets);
>> +   if (!offsets)
>> +      goto error_offsets;
>> +
>> +   sizes.x = (float)(size);
>> +   sizes.y = (float)(size);
>> +
>> +   for (v.x = -sizes.x + 1.0f, i = 0; v.x <= sizes.x; v.x += 1.0f)
>> +      for (v.y = -sizes.y + 1.0f; v.y <= sizes.y; v.y += 1.0f)
>> +         offsets[i++] = v;
>> +
>> +   for (i = 0; i < num_offsets; ++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, num_offsets, offsets, size,
>> width, height);
>> +   if (!filter->fs)
>> +      goto error_fs;
>> +
>> +   FREE(offsets);
>> +   return true;
>> +
>> +error_fs:
>> +   pipe->delete_vs_state(pipe, filter->vs);
>> +
>> +error_vs:
>> +   FREE(offsets);
>> +
>> +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_lanczos_filter_cleanup(struct vl_lanczos_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_lanczos_filter_render(struct vl_lanczos_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_lanczos_filter.h
>> b/src/gallium/auxiliary/vl/vl_lanczos_filter.h
>> new file mode 100644
>> index 0000000..cb469aa
>> --- /dev/null
>> +++ b/src/gallium/auxiliary/vl/vl_lanczos_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 lanczos interpolation filter */
>> +
>> +#ifndef vl_lanczos_filter_h
>> +#define vl_lanczos_filter_h
>> +
>> +#include "pipe/p_state.h"
>> +
>> +struct vl_lanczos_filter
>> +{
>> +   struct pipe_context *pipe;
>> +   struct pipe_vertex_buffer quad;
>> +
>> +   void *rs_state;
>> +   void *blend;
>> +   void *sampler;
>> +   void *ves;
>> +   void *vs, *fs;
>> +};
>> +
>> +bool
>> +vl_lanczos_filter_init(struct vl_lanczos_filter *filter, struct
>> pipe_context *pipe,
>> +                       unsigned size, unsigned width, unsigned height);
>> +
>> +void
>> +vl_lanczos_filter_cleanup(struct vl_lanczos_filter *filter);
>> +
>> +
>> +void
>> +vl_lanczos_filter_render(struct vl_lanczos_filter *filter,
>> +                         struct pipe_sampler_view *src,
>> +                         struct pipe_surface *dst,
>> +                         struct u_rect *dst_area,
>> +                         struct u_rect *dst_clip);
>> +
>> +
>> +#endif /* vl_lanczos_filter_h */
>>
>
>
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