Hi Christian,
Thanks for the review.
On Tue, Jul 19, 2016 at 4:58 PM, Christian König
<deathsim...@vodafone.de <mailto:deathsim...@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 <nayan26deshm...@gmail.com
<mailto:nayan26deshm...@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 */
