OpenVG 1.0 State Tracker

Import of the OpenVG 1.0 state tracker for Gallium.

1 files changed, 699 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/vega/paint.c b/src/gallium/state_trackers/vega/paint.c
new file mode 100644
index 00000000000..04a6ba9cdcd
--- /dev/null
+++ b/src/gallium/state_trackers/vega/paint.c
@@ -0,0 +1,699 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.  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 "paint.h"
+
+#include "shaders_cache.h"
+#include "matrix.h"
+#include "image.h"
+#include "st_inlines.h"
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_inlines.h"
+
+#include "util/u_memory.h"
+#include "util/u_math.h"
+
+#include "cso_cache/cso_context.h"
+
+struct vg_paint {
+   struct vg_object base;
+
+   VGPaintType type;
+
+   struct {
+      VGfloat color[4];
+      VGint colori[4];
+   } solid;
+
+   struct {
+      VGColorRampSpreadMode spread;
+      VGuint color_data[1024];
+      struct {
+         VGfloat  coords[4];
+         VGint  coordsi[4];
+      } linear;
+      struct {
+         VGfloat vals[5];
+         VGint valsi[5];
+      } radial;
+      struct pipe_texture *texture;
+      struct pipe_sampler_state sampler;
+
+      VGfloat *ramp_stops;
+      VGint *ramp_stopsi;
+      VGint    num_stops;
+
+      VGboolean color_ramps_premultiplied;
+   } gradient;
+
+   struct {
+      struct pipe_texture *texture;
+      VGTilingMode tiling_mode;
+      struct pipe_sampler_state sampler;
+   } pattern;
+
+   struct pipe_constant_buffer cbuf;
+   struct pipe_shader_state fs_state;
+   void *fs;
+};
+
+static INLINE VGuint mix_pixels(VGuint p1, VGuint a, VGuint p2, VGuint b)
+{
+   VGuint t = (p1 & 0xff00ff) * a + (p2 & 0xff00ff) * b;
+   t >>= 8; t &= 0xff00ff;
+
+   p1 = ((p1 >> 8) & 0xff00ff) * a + ((p2 >> 8) & 0xff00ff) * b;
+   p1 &= 0xff00ff00; p1 |= t;
+
+   return p1;
+}
+
+static INLINE VGuint float4_to_argb(const VGfloat *clr)
+{
+   return float_to_ubyte(clr[3]) << 24 |
+      float_to_ubyte(clr[0]) << 16 |
+      float_to_ubyte(clr[1]) << 8 |
+      float_to_ubyte(clr[2]) << 0;
+}
+
+static INLINE void create_gradient_data(const VGfloat *ramp_stops,
+                                        VGint num,
+                                        VGuint *data,
+                                        VGint size)
+{
+   VGint i;
+   VGint pos = 0;
+   VGfloat fpos = 0, incr = 1.f / size;
+   VGuint last_color;
+
+   while (fpos < ramp_stops[0]) {
+      data[pos] = float4_to_argb(ramp_stops + 1);
+      fpos += incr;
+      ++pos;
+   }
+
+   for (i = 0; i < num - 1; ++i) {
+      VGint rcur  = 5 * i;
+      VGint rnext = 5 * (i + 1);
+      VGfloat delta = 1.f/(ramp_stops[rnext] - ramp_stops[rcur]);
+      while (fpos < ramp_stops[rnext] && pos < size) {
+         VGint dist = 256 * ((fpos - ramp_stops[rcur]) * delta);
+         VGint idist = 256 - dist;
+         VGuint current_color = float4_to_argb(ramp_stops + rcur + 1);
+         VGuint next_color = float4_to_argb(ramp_stops + rnext + 1);
+         data[pos] = mix_pixels(current_color, idist,
+                                next_color, dist);
+         fpos += incr;
+         ++pos;
+      }
+   }
+
+   last_color = float4_to_argb(ramp_stops + ((num - 1) * 5 + 1));
+   while (pos < size) {
+      data[pos] = last_color;
+      ++pos;
+   }
+   data[size-1] = last_color;
+}
+
+static INLINE struct pipe_texture *create_gradient_texture(struct vg_paint *p)
+{
+   struct pipe_context *pipe = p->base.ctx->pipe;
+   struct pipe_screen *screen = pipe->screen;
+   struct pipe_texture *tex = 0;
+   struct pipe_texture templ;
+
+   memset(&templ, 0, sizeof(templ));
+   templ.target = PIPE_TEXTURE_1D;
+   templ.format = PIPE_FORMAT_A8R8G8B8_UNORM;
+   templ.last_level = 0;
+   templ.width[0] = 1024;
+   templ.height[0] = 1;
+   templ.depth[0] = 1;
+   pf_get_block(PIPE_FORMAT_A8R8G8B8_UNORM, &templ.block);
+   templ.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;
+
+   tex = screen->texture_create(screen, &templ);
+
+   { /* upload color_data */
+      struct pipe_transfer *transfer =
+         st_no_flush_get_tex_transfer(p->base.ctx, tex, 0, 0, 0,
+                                      PIPE_TRANSFER_WRITE, 0, 0, 1024, 1);
+      void *map = screen->transfer_map(screen, transfer);
+      memcpy(map, p->gradient.color_data, sizeof(VGint)*1024);
+      screen->transfer_unmap(screen, transfer);
+      screen->tex_transfer_destroy(transfer);
+   }
+
+   return tex;
+}
+
+struct vg_paint * paint_create(struct vg_context *ctx)
+{
+   struct vg_paint *paint = CALLOC_STRUCT(vg_paint);
+   const VGfloat default_color[] = {0.0f, 0.0f, 0.0f, 1.0f};
+   const VGfloat def_ling[] = {0.0f, 0.0f, 1.0f, 0.0f};
+   const VGfloat def_radg[] = {0.0f, 0.0f, 0.0f, 0.0f, 1.0f};
+   vg_init_object(&paint->base, ctx, VG_OBJECT_PAINT);
+   vg_context_add_object(ctx, VG_OBJECT_PAINT, paint);
+
+   paint->type = VG_PAINT_TYPE_COLOR;
+   memcpy(paint->solid.color, default_color,
+          4 * sizeof(VGfloat));
+   paint->gradient.spread = VG_COLOR_RAMP_SPREAD_PAD;
+   memcpy(paint->gradient.linear.coords, def_ling,
+          4 * sizeof(VGfloat));
+   memcpy(paint->gradient.radial.vals, def_radg,
+          5 * sizeof(VGfloat));
+
+   paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   paint->gradient.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   paint->gradient.sampler.min_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
+   paint->gradient.sampler.mag_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
+   paint->gradient.sampler.normalized_coords = 1;
+
+   memcpy(&paint->pattern.sampler,
+          &paint->gradient.sampler,
+          sizeof(struct pipe_sampler_state));
+
+   return paint;
+}
+
+void paint_destroy(struct vg_paint *paint)
+{
+   struct vg_context *ctx = paint->base.ctx;
+   if (paint->pattern.texture)
+      pipe_texture_reference(&paint->pattern.texture, NULL);
+   if (ctx)
+      vg_context_remove_object(ctx, VG_OBJECT_PAINT, paint);
+
+   free(paint->gradient.ramp_stopsi);
+   free(paint->gradient.ramp_stops);
+   free(paint);
+}
+
+void paint_set_color(struct vg_paint *paint,
+                     const VGfloat *color)
+{
+   paint->solid.color[0] = color[0];
+   paint->solid.color[1] = color[1];
+   paint->solid.color[2] = color[2];
+   paint->solid.color[3] = color[3];
+
+   paint->solid.colori[0] = FLT_TO_INT(color[0]);
+   paint->solid.colori[1] = FLT_TO_INT(color[1]);
+   paint->solid.colori[2] = FLT_TO_INT(color[2]);
+   paint->solid.colori[3] = FLT_TO_INT(color[3]);
+}
+
+static INLINE void paint_color_buffer(struct vg_paint *paint, void *buffer)
+{
+   VGfloat *map = (VGfloat*)buffer;
+   memcpy(buffer, paint->solid.color, 4 * sizeof(VGfloat));
+   map[4] = 0.f;
+   map[5] = 1.f;
+   map[6] = 2.f;
+   map[7] = 4.f;
+}
+
+static INLINE void paint_linear_gradient_buffer(struct vg_paint *paint, void *buffer)
+{
+   struct vg_context *ctx = paint->base.ctx;
+   VGfloat *map = (VGfloat*)buffer;
+
+   map[0] = paint->gradient.linear.coords[2] - paint->gradient.linear.coords[0];
+   map[1] = paint->gradient.linear.coords[3] - paint->gradient.linear.coords[1];
+   map[2] = 1.f / (map[0] * map[0] + map[1] * map[1]);
+   map[3] = 1.f;
+
+   map[4] = 0.f;
+   map[5] = 1.f;
+   map[6] = 2.f;
+   map[7] = 4.f;
+   {
+      struct matrix mat;
+      struct matrix inv;
+      matrix_load_identity(&mat);
+      matrix_translate(&mat, -paint->gradient.linear.coords[0], -paint->gradient.linear.coords[1]);
+      memcpy(&inv, &ctx->state.vg.fill_paint_to_user_matrix,
+             sizeof(struct matrix));
+      matrix_invert(&inv);
+      matrix_mult(&inv, &mat);
+      memcpy(&mat, &inv,
+             sizeof(struct matrix));
+
+      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
+      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
+      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
+   }
+#if 0
+   debug_printf("Coords  (%f, %f, %f, %f)\n",
+                map[0], map[1], map[2], map[3]);
+#endif
+}
+
+
+static INLINE void paint_radial_gradient_buffer(struct vg_paint *paint, void *buffer)
+{
+   VGfloat *radialCoords = paint->gradient.radial.vals;
+   struct vg_context *ctx = paint->base.ctx;
+
+   VGfloat *map = (VGfloat*)buffer;
+
+   map[0] = radialCoords[0] - radialCoords[2];
+   map[1] = radialCoords[1] - radialCoords[3];
+   map[2] = -map[0] * map[0] - map[1] * map[1] +
+            radialCoords[4] * radialCoords[4];
+   map[3] = 1.f;
+
+   map[4] = 0.f;
+   map[5] = 1.f;
+   map[6] = 2.f;
+   map[7] = 4.f;
+
+   {
+      struct matrix mat;
+      struct matrix inv;
+      matrix_load_identity(&mat);
+      matrix_translate(&mat, -radialCoords[2], -radialCoords[3]);
+      memcpy(&inv, &ctx->state.vg.fill_paint_to_user_matrix,
+             sizeof(struct matrix));
+      matrix_invert(&inv);
+      matrix_mult(&inv, &mat);
+      memcpy(&mat, &inv,
+             sizeof(struct matrix));
+
+      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
+      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
+      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
+   }
+
+#if 0
+   debug_printf("Coords  (%f, %f, %f, %f)\n",
+                map[0], map[1], map[2], map[3]);
+#endif
+}
+
+
+static INLINE void  paint_pattern_buffer(struct vg_paint *paint, void *buffer)
+{
+   struct vg_context *ctx = paint->base.ctx;
+
+   VGfloat *map = (VGfloat *)buffer;
+   memcpy(map, paint->solid.color, 4 * sizeof(VGfloat));
+
+   map[4] = 0.f;
+   map[5] = 1.f;
+   map[6] = paint->pattern.texture->width[0];
+   map[7] = paint->pattern.texture->height[0];
+   {
+      struct matrix mat;
+      memcpy(&mat, &ctx->state.vg.fill_paint_to_user_matrix,
+             sizeof(struct matrix));
+      matrix_invert(&mat);
+      {
+         struct matrix pm;
+         memcpy(&pm, &ctx->state.vg.path_user_to_surface_matrix,
+                sizeof(struct matrix));
+         matrix_invert(&pm);
+         matrix_mult(&pm, &mat);
+         memcpy(&mat, &pm, sizeof(struct matrix));
+      }
+
+      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
+      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
+      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
+   }
+}
+
+void paint_set_type(struct vg_paint *paint, VGPaintType type)
+{
+   paint->type = type;
+}
+
+void paint_set_ramp_stops(struct vg_paint *paint, const VGfloat *stops,
+                          int num)
+{
+   const VGfloat default_stops[] = {0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+                                    1.0f, 1.0f, 1.0f, 1.0f, 1.0f};
+   VGint i;
+   const VGint num_stops = num / 5;
+   VGfloat last_coord;
+
+   paint->gradient.num_stops = num;
+   if (num) {
+      free(paint->gradient.ramp_stops);
+      paint->gradient.ramp_stops = malloc(sizeof(VGfloat)*num);
+      memcpy(paint->gradient.ramp_stops, stops, sizeof(VGfloat)*num);
+   } else
+      return;
+
+   /* stops must be in increasing order. the last stop is 1.0. if the
+    * first one is bigger than 1 then the whole sequence is invalid*/
+   if (stops[0] > 1) {
+      stops = default_stops;
+      num = 10;
+   }
+   last_coord = stops[0];
+   for (i = 1; i < num_stops; ++i) {
+      VGint idx = 5 * i;
+      VGfloat coord = stops[idx];
+      if (!floatsEqual(last_coord, coord) && coord < last_coord) {
+         stops = default_stops;
+         num = 10;
+         break;
+      }
+      last_coord = coord;
+   }
+
+   create_gradient_data(stops, num / 5, paint->gradient.color_data,
+                        1024);
+
+   if (paint->gradient.texture) {
+      pipe_texture_reference(&paint->gradient.texture, NULL);
+      paint->gradient.texture = 0;
+   }
+
+   paint->gradient.texture = create_gradient_texture(paint);
+}
+
+void paint_set_colori(struct vg_paint *p,
+                      VGuint rgba)
+{
+   p->solid.color[0] = ((rgba >> 24) & 0xff) / 255.f;
+   p->solid.color[1] = ((rgba >> 16) & 0xff) / 255.f;
+   p->solid.color[2] = ((rgba >>  8) & 0xff) / 255.f;
+   p->solid.color[3] = ((rgba >>  0) & 0xff) / 255.f;
+}
+
+VGuint paint_colori(struct vg_paint *p)
+{
+#define F2B(f) (float_to_ubyte(f))
+
+   return ((F2B(p->solid.color[0]) << 24) |
+           (F2B(p->solid.color[1]) << 16) |
+           (F2B(p->solid.color[2]) << 8)  |
+           (F2B(p->solid.color[3]) << 0));
+#undef F2B
+}
+
+void paint_set_linear_gradient(struct vg_paint *paint,
+                               const VGfloat *coords)
+{
+   memcpy(paint->gradient.linear.coords, coords, sizeof(VGfloat) * 4);
+}
+
+void paint_set_spread_mode(struct vg_paint *paint,
+                           VGint mode)
+{
+   paint->gradient.spread = mode;
+   switch(mode) {
+   case VG_COLOR_RAMP_SPREAD_PAD:
+      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+      break;
+   case VG_COLOR_RAMP_SPREAD_REPEAT:
+      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
+      break;
+   case VG_COLOR_RAMP_SPREAD_REFLECT:
+      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_MIRROR_REPEAT;
+      break;
+   }
+}
+
+VGColorRampSpreadMode paint_spread_mode(struct vg_paint *paint)
+{
+   return paint->gradient.spread;
+}
+
+void paint_set_radial_gradient(struct vg_paint *paint,
+                               const VGfloat *values)
+{
+   memcpy(paint->gradient.radial.vals, values, sizeof(VGfloat) * 5);
+}
+
+void paint_set_pattern(struct vg_paint *paint,
+                       struct vg_image *img)
+{
+   if (paint->pattern.texture)
+      pipe_texture_reference(&paint->pattern.texture, NULL);
+
+   paint->pattern.texture = 0;
+   pipe_texture_reference(&paint->pattern.texture,
+                          img->texture);
+}
+
+void paint_set_pattern_tiling(struct vg_paint *paint,
+                              VGTilingMode mode)
+{
+   paint->pattern.tiling_mode = mode;
+
+   switch(mode) {
+   case VG_TILE_FILL:
+      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
+      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
+      break;
+   case VG_TILE_PAD:
+      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+      break;
+   case VG_TILE_REPEAT:
+      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
+      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_REPEAT;
+      break;
+   case VG_TILE_REFLECT:
+      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_MIRROR_REPEAT;
+      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_MIRROR_REPEAT;
+      break;
+   default:
+      debug_assert("!Unknown tiling mode");
+   }
+}
+
+void paint_get_color(struct vg_paint *paint,
+                     VGfloat *color)
+{
+   color[0] = paint->solid.color[0];
+   color[1] = paint->solid.color[1];
+   color[2] = paint->solid.color[2];
+   color[3] = paint->solid.color[3];
+}
+
+void paint_ramp_stops(struct vg_paint *paint, VGfloat *stops,
+                      int num)
+{
+   memcpy(stops, paint->gradient.ramp_stops, sizeof(VGfloat)*num);
+}
+
+void paint_linear_gradient(struct vg_paint *paint,
+                           VGfloat *coords)
+{
+   memcpy(coords, paint->gradient.linear.coords, sizeof(VGfloat)*4);
+}
+
+void paint_radial_gradient(struct vg_paint *paint,
+                           VGfloat *coords)
+{
+   memcpy(coords, paint->gradient.radial.vals, sizeof(VGfloat)*5);
+}
+
+int paint_num_ramp_stops(struct vg_paint *paint)
+{
+   return paint->gradient.num_stops;
+}
+
+VGPaintType paint_type(struct vg_paint *paint)
+{
+   return paint->type;
+}
+
+void paint_set_coloriv(struct vg_paint *paint,
+                      const VGint *color)
+{
+   paint->solid.color[0] = color[0];
+   paint->solid.color[1] = color[1];
+   paint->solid.color[2] = color[2];
+   paint->solid.color[3] = color[3];
+
+   paint->solid.colori[0] = color[0];
+   paint->solid.colori[1] = color[1];
+   paint->solid.colori[2] = color[2];
+   paint->solid.colori[3] = color[3];
+}
+
+void paint_get_coloriv(struct vg_paint *paint,
+                      VGint *color)
+{
+   color[0] = paint->solid.colori[0];
+   color[1] = paint->solid.colori[1];
+   color[2] = paint->solid.colori[2];
+   color[3] = paint->solid.colori[3];
+}
+
+void paint_set_color_ramp_premultiplied(struct vg_paint *paint,
+                                        VGboolean set)
+{
+   paint->gradient.color_ramps_premultiplied = set;
+}
+
+VGboolean paint_color_ramp_premultiplied(struct vg_paint *paint)
+{
+   return paint->gradient.color_ramps_premultiplied;
+}
+
+void paint_set_ramp_stopsi(struct vg_paint *paint, const VGint *stops,
+                           int num)
+{
+   if (num) {
+      free(paint->gradient.ramp_stopsi);
+      paint->gradient.ramp_stopsi = malloc(sizeof(VGint)*num);
+      memcpy(paint->gradient.ramp_stopsi, stops, sizeof(VGint)*num);
+   }
+}
+
+void paint_ramp_stopsi(struct vg_paint *paint, VGint *stops,
+                       int num)
+{
+   memcpy(stops, paint->gradient.ramp_stopsi, sizeof(VGint)*num);
+}
+
+void paint_set_linear_gradienti(struct vg_paint *paint,
+                                const VGint *coords)
+{
+   memcpy(paint->gradient.linear.coordsi, coords, sizeof(VGint) * 4);
+}
+
+void paint_linear_gradienti(struct vg_paint *paint,
+                            VGint *coords)
+{
+   memcpy(coords, paint->gradient.linear.coordsi, sizeof(VGint)*4);
+}
+
+void paint_set_radial_gradienti(struct vg_paint *paint,
+                                const VGint *values)
+{
+   memcpy(paint->gradient.radial.valsi, values, sizeof(VGint) * 5);
+}
+
+void paint_radial_gradienti(struct vg_paint *paint,
+                            VGint *coords)
+{
+   memcpy(coords, paint->gradient.radial.valsi, sizeof(VGint)*5);
+}
+
+VGTilingMode paint_pattern_tiling(struct vg_paint *paint)
+{
+   return paint->pattern.tiling_mode;
+}
+
+VGint paint_bind_samplers(struct vg_paint *paint, struct pipe_sampler_state **samplers,
+                          struct pipe_texture **textures)
+{
+   struct vg_context *ctx = vg_current_context();
+
+   switch(paint->type) {
+   case VG_PAINT_TYPE_LINEAR_GRADIENT:
+   case VG_PAINT_TYPE_RADIAL_GRADIENT: {
+      if (paint->gradient.texture) {
+         paint->gradient.sampler.min_img_filter = image_sampler_filter(ctx);
+         paint->gradient.sampler.mag_img_filter = image_sampler_filter(ctx);
+         samplers[0] = &paint->gradient.sampler;
+         textures[0] = paint->gradient.texture;
+         return 1;
+      }
+   }
+      break;
+   case VG_PAINT_TYPE_PATTERN: {
+      memcpy(paint->pattern.sampler.border_color,
+             ctx->state.vg.tile_fill_color,
+             sizeof(VGfloat) * 4);
+      paint->pattern.sampler.min_img_filter = image_sampler_filter(ctx);
+      paint->pattern.sampler.mag_img_filter = image_sampler_filter(ctx);
+      samplers[0] = &paint->pattern.sampler;
+      textures[0] = paint->pattern.texture;
+      return 1;
+   }
+      break;
+   default:
+      samplers[0] = &paint->pattern.sampler; /* dummy */
+      textures[0] = 0;
+      return 0;
+      break;
+   }
+   return 0;
+}
+
+void paint_resolve_type(struct vg_paint *paint)
+{
+   if (paint->type == VG_PAINT_TYPE_PATTERN &&
+       !paint->pattern.texture) {
+      paint->type = VG_PAINT_TYPE_COLOR;
+   }
+}
+
+VGint paint_constant_buffer_size(struct vg_paint *paint)
+{
+   switch(paint->type) {
+   case VG_PAINT_TYPE_COLOR:
+      return 8 * sizeof(VGfloat);/*4 color + 4 constants (0.f,1.f,2.f,4.f)*/
+      break;
+   case VG_PAINT_TYPE_LINEAR_GRADIENT:
+      return 20 * sizeof(VGfloat);
+      break;
+   case VG_PAINT_TYPE_RADIAL_GRADIENT:
+      return 20 * sizeof(VGfloat);
+      break;
+   case VG_PAINT_TYPE_PATTERN:
+      return 20 * sizeof(VGfloat);
+      break;
+   default:
+      debug_printf("Uknown paint type: %d\n", paint->type);
+   }
+
+   return 0;
+}
+
+void paint_fill_constant_buffer(struct vg_paint *paint,
+                                void *buffer)
+{
+   switch(paint->type) {
+   case VG_PAINT_TYPE_COLOR:
+      paint_color_buffer(paint, buffer);
+      break;
+   case VG_PAINT_TYPE_LINEAR_GRADIENT:
+      paint_linear_gradient_buffer(paint, buffer);
+      break;
+   case VG_PAINT_TYPE_RADIAL_GRADIENT:
+      paint_radial_gradient_buffer(paint, buffer);
+      break;
+   case VG_PAINT_TYPE_PATTERN:
+      paint_pattern_buffer(paint, buffer);
+      break;
+
+   default:
+      abort();
+   }
+}