Mesa (master): util: add blitter

Keith Whitwell keithw at kemper.freedesktop.org
Tue Dec 15 10:17:38 PST 2009


Module: Mesa
Branch: master
Commit: 55753f59ae1754738bed4b0cb6546db65891f53f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=55753f59ae1754738bed4b0cb6546db65891f53f

Author: Marek Olšák <maraeo at gmail.com>
Date:   Thu Dec 10 10:25:33 2009 +0100

util: add blitter

---

 src/gallium/auxiliary/util/Makefile    |    1 +
 src/gallium/auxiliary/util/SConscript  |    1 +
 src/gallium/auxiliary/util/u_blitter.c |  605 ++++++++++++++++++++++++++++++++
 src/gallium/auxiliary/util/u_blitter.h |  244 +++++++++++++
 4 files changed, 851 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/Makefile b/src/gallium/auxiliary/util/Makefile
index c36a87a..3ed90fd 100644
--- a/src/gallium/auxiliary/util/Makefile
+++ b/src/gallium/auxiliary/util/Makefile
@@ -9,6 +9,7 @@ C_SOURCES = \
 	u_debug_symbol.c \
 	u_debug_stack.c \
 	u_blit.c \
+	u_blitter.c \
 	u_cache.c \
 	u_cpu_detect.c \
 	u_dl.c \
diff --git a/src/gallium/auxiliary/util/SConscript b/src/gallium/auxiliary/util/SConscript
index 6e34c3b..2a546d1 100644
--- a/src/gallium/auxiliary/util/SConscript
+++ b/src/gallium/auxiliary/util/SConscript
@@ -23,6 +23,7 @@ util = env.ConvenienceLibrary(
 	source = [
 		'u_bitmask.c',
 		'u_blit.c',
+		'u_blitter.c',
 		'u_cache.c',
 		'u_cpu_detect.c',
 		'u_debug.c',
diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
new file mode 100644
index 0000000..e51a5df
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -0,0 +1,605 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Marek Olšák <maraeo at gmail.com>
+ *
+ * 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 TUNGSTEN GRAPHICS 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Blitter utility to facilitate acceleration of the clear, surface_copy,
+ * and surface_fill functions.
+ *
+ * @author Marek Olšák
+ */
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_shader_tokens.h"
+#include "pipe/p_state.h"
+
+#include "util/u_memory.h"
+#include "util/u_math.h"
+#include "util/u_blitter.h"
+#include "util/u_draw_quad.h"
+#include "util/u_pack_color.h"
+#include "util/u_rect.h"
+#include "util/u_simple_shaders.h"
+#include "util/u_texture.h"
+
+struct blitter_context_priv
+{
+   struct blitter_context blitter;
+
+   struct pipe_context *pipe; /**< pipe context */
+   struct pipe_buffer *vbuf;  /**< quad */
+
+   float vertices[4][2][4];   /**< {pos, color} or {pos, texcoord} */
+
+   /* Constant state objects. */
+   /* Vertex shaders. */
+   void *vs_col; /**< Vertex shader which passes {pos, color} to the output */
+   void *vs_tex; /**<Vertex shader which passes {pos, texcoord} to the output.*/
+
+   /* Fragment shaders. */
+   void *fs_col[8];     /**< FS which outputs colors to 1-8 color buffers */
+   void *fs_texfetch_col[4];   /**< FS which outputs a color from a texture */
+   void *fs_texfetch_depth[4]; /**< FS which outputs a depth from a texture,
+                              where the index is PIPE_TEXTURE_* to be sampled */
+
+   /* Blend state. */
+   void *blend_write_color;   /**< blend state with writemask of RGBA */
+   void *blend_keep_color;    /**< blend state with writemask of 0 */
+
+   /* Depth stencil alpha state. */
+   void *dsa_write_depth_stencil[0xff]; /**< indices are stencil clear values */
+   void *dsa_write_depth_keep_stencil;
+   void *dsa_keep_depth_stencil;
+
+   /* Other state. */
+   void *sampler_state[16];   /**< sampler state for clamping to a miplevel */
+   void *rs_state;            /**< rasterizer state */
+};
+
+struct blitter_context *util_blitter_create(struct pipe_context *pipe)
+{
+   struct blitter_context_priv *ctx;
+   struct pipe_blend_state blend;
+   struct pipe_depth_stencil_alpha_state dsa;
+   struct pipe_rasterizer_state rs_state;
+   struct pipe_sampler_state sampler_state;
+   unsigned i, max_render_targets;
+
+   ctx = CALLOC_STRUCT(blitter_context_priv);
+   if (!ctx)
+      return NULL;
+
+   ctx->pipe = pipe;
+
+   /* init state objects for them to be considered invalid */
+   ctx->blitter.saved_fb_state.nr_cbufs = ~0;
+   ctx->blitter.saved_num_textures = ~0;
+   ctx->blitter.saved_num_sampler_states = ~0;
+
+   /* blend state objects */
+   memset(&blend, 0, sizeof(blend));
+   ctx->blend_keep_color = pipe->create_blend_state(pipe, &blend);
+
+   blend.colormask = PIPE_MASK_RGBA;
+   ctx->blend_write_color = pipe->create_blend_state(pipe, &blend);
+
+   /* depth stencil alpha state objects */
+   memset(&dsa, 0, sizeof(dsa));
+   ctx->dsa_keep_depth_stencil =
+      pipe->create_depth_stencil_alpha_state(pipe, &dsa);
+
+   dsa.depth.enabled = 1;
+   dsa.depth.writemask = 1;
+   dsa.depth.func = PIPE_FUNC_ALWAYS;
+   ctx->dsa_write_depth_keep_stencil =
+      pipe->create_depth_stencil_alpha_state(pipe, &dsa);
+
+   dsa.stencil[0].enabled = 1;
+   dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
+   dsa.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
+   dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
+   dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
+   dsa.stencil[0].valuemask = 0xff;
+   dsa.stencil[0].writemask = 0xff;
+
+   /* create a depth stencil alpha state for each possible stencil clear
+    * value */
+   for (i = 0; i < 0xff; i++) {
+      dsa.stencil[0].ref_value = i;
+
+      ctx->dsa_write_depth_stencil[i] =
+         pipe->create_depth_stencil_alpha_state(pipe, &dsa);
+   }
+
+   /* sampler state */
+   memset(&sampler_state, 0, sizeof(sampler_state));
+   sampler_state.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   sampler_state.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   sampler_state.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+
+   for (i = 0; i < 16; i++) {
+      sampler_state.lod_bias = i;
+      sampler_state.min_lod = i;
+      sampler_state.max_lod = i;
+
+      ctx->sampler_state[i] = pipe->create_sampler_state(pipe, &sampler_state);
+   }
+
+   /* rasterizer state */
+   memset(&rs_state, 0, sizeof(rs_state));
+   rs_state.front_winding = PIPE_WINDING_CW;
+   rs_state.cull_mode = PIPE_WINDING_NONE;
+   rs_state.bypass_vs_clip_and_viewport = 1;
+   rs_state.gl_rasterization_rules = 1;
+   ctx->rs_state = pipe->create_rasterizer_state(pipe, &rs_state);
+
+   /* vertex shaders */
+   {
+      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
+                                      TGSI_SEMANTIC_COLOR };
+      const uint semantic_indices[] = { 0, 0 };
+      ctx->vs_col =
+         util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
+                                             semantic_indices);
+   }
+   {
+      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
+                                      TGSI_SEMANTIC_GENERIC };
+      const uint semantic_indices[] = { 0, 0 };
+      ctx->vs_tex =
+         util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
+                                             semantic_indices);
+   }
+
+   /* fragment shaders */
+   ctx->fs_texfetch_col[PIPE_TEXTURE_1D] =
+      util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_1D);
+   ctx->fs_texfetch_col[PIPE_TEXTURE_2D] =
+      util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D);
+   ctx->fs_texfetch_col[PIPE_TEXTURE_3D] =
+      util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_3D);
+   ctx->fs_texfetch_col[PIPE_TEXTURE_CUBE] =
+      util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_CUBE);
+
+   ctx->fs_texfetch_depth[PIPE_TEXTURE_1D] =
+      util_make_fragment_tex_shader_writedepth(pipe, TGSI_TEXTURE_1D);
+   ctx->fs_texfetch_depth[PIPE_TEXTURE_2D] =
+      util_make_fragment_tex_shader_writedepth(pipe, TGSI_TEXTURE_2D);
+   ctx->fs_texfetch_depth[PIPE_TEXTURE_3D] =
+      util_make_fragment_tex_shader_writedepth(pipe, TGSI_TEXTURE_3D);
+   ctx->fs_texfetch_depth[PIPE_TEXTURE_CUBE] =
+      util_make_fragment_tex_shader_writedepth(pipe, TGSI_TEXTURE_CUBE);
+
+   max_render_targets = pipe->screen->get_param(pipe->screen,
+                                                PIPE_CAP_MAX_RENDER_TARGETS);
+   assert(max_render_targets <= 8);
+   for (i = 0; i < max_render_targets; i++)
+      ctx->fs_col[i] = util_make_fragment_clonecolor_shader(pipe, 1+i);
+
+   /* set invariant vertex coordinates */
+   for (i = 0; i < 4; i++)
+      ctx->vertices[i][0][3] = 1; /*v.w*/
+
+   /* create the vertex buffer */
+   ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
+                                  32,
+                                  PIPE_BUFFER_USAGE_VERTEX,
+                                  sizeof(ctx->vertices));
+
+   return &ctx->blitter;
+}
+
+void util_blitter_destroy(struct blitter_context *blitter)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->pipe;
+   int i;
+
+   pipe->delete_blend_state(pipe, ctx->blend_write_color);
+   pipe->delete_blend_state(pipe, ctx->blend_keep_color);
+   pipe->delete_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
+   pipe->delete_depth_stencil_alpha_state(pipe,
+                                          ctx->dsa_write_depth_keep_stencil);
+
+   for (i = 0; i < 0xff; i++)
+      pipe->delete_depth_stencil_alpha_state(pipe,
+                                             ctx->dsa_write_depth_stencil[i]);
+
+   pipe->delete_rasterizer_state(pipe, ctx->rs_state);
+   pipe->delete_vs_state(pipe, ctx->vs_col);
+   pipe->delete_vs_state(pipe, ctx->vs_tex);
+
+   for (i = 0; i < 4; i++) {
+      pipe->delete_fs_state(pipe, ctx->fs_texfetch_col[i]);
+      pipe->delete_fs_state(pipe, ctx->fs_texfetch_depth[i]);
+   }
+   for (i = 0; i < 8 && ctx->fs_col[i]; i++)
+      pipe->delete_fs_state(pipe, ctx->fs_col[i]);
+
+   pipe_buffer_reference(&ctx->vbuf, NULL);
+   FREE(ctx);
+}
+
+static void blitter_check_saved_CSOs(struct blitter_context_priv *ctx)
+{
+   /* make sure these CSOs have been saved */
+   assert(ctx->blitter.saved_blend_state &&
+          ctx->blitter.saved_dsa_state &&
+          ctx->blitter.saved_rs_state &&
+          ctx->blitter.saved_fs &&
+          ctx->blitter.saved_vs);
+}
+
+static void blitter_restore_CSOs(struct blitter_context_priv *ctx)
+{
+   struct pipe_context *pipe = ctx->pipe;
+
+   /* restore the state objects which are always required to be saved */
+   pipe->bind_blend_state(pipe, ctx->blitter.saved_blend_state);
+   pipe->bind_depth_stencil_alpha_state(pipe, ctx->blitter.saved_dsa_state);
+   pipe->bind_rasterizer_state(pipe, ctx->blitter.saved_rs_state);
+   pipe->bind_fs_state(pipe, ctx->blitter.saved_fs);
+   pipe->bind_vs_state(pipe, ctx->blitter.saved_vs);
+
+   ctx->blitter.saved_blend_state = 0;
+   ctx->blitter.saved_dsa_state = 0;
+   ctx->blitter.saved_rs_state = 0;
+   ctx->blitter.saved_fs = 0;
+   ctx->blitter.saved_vs = 0;
+
+   /* restore the state objects which are required to be saved before copy/fill
+    */
+   if (ctx->blitter.saved_fb_state.nr_cbufs != ~0) {
+      pipe->set_framebuffer_state(pipe, &ctx->blitter.saved_fb_state);
+      ctx->blitter.saved_fb_state.nr_cbufs = ~0;
+   }
+
+   if (ctx->blitter.saved_num_sampler_states != ~0) {
+      pipe->bind_fragment_sampler_states(pipe,
+                                         ctx->blitter.saved_num_sampler_states,
+                                         ctx->blitter.saved_sampler_states);
+      ctx->blitter.saved_num_sampler_states = ~0;
+   }
+
+   if (ctx->blitter.saved_num_textures != ~0) {
+      pipe->set_fragment_sampler_textures(pipe,
+                                          ctx->blitter.saved_num_textures,
+                                          ctx->blitter.saved_textures);
+      ctx->blitter.saved_num_textures = ~0;
+   }
+}
+
+static void blitter_set_rectangle(struct blitter_context_priv *ctx,
+                                  unsigned x1, unsigned y1,
+                                  unsigned x2, unsigned y2,
+                                  float depth)
+{
+   int i;
+
+   /* set vertex positions */
+   ctx->vertices[0][0][0] = x1; /*v0.x*/
+   ctx->vertices[0][0][1] = y1; /*v0.y*/
+
+   ctx->vertices[1][0][0] = x2; /*v1.x*/
+   ctx->vertices[1][0][1] = y1; /*v1.y*/
+
+   ctx->vertices[2][0][0] = x2; /*v2.x*/
+   ctx->vertices[2][0][1] = y2; /*v2.y*/
+
+   ctx->vertices[3][0][0] = x1; /*v3.x*/
+   ctx->vertices[3][0][1] = y2; /*v3.y*/
+
+   for (i = 0; i < 4; i++)
+      ctx->vertices[i][0][2] = depth; /*z*/
+}
+
+static void blitter_set_clear_color(struct blitter_context_priv *ctx,
+                                    const float *rgba)
+{
+   int i;
+
+   for (i = 0; i < 4; i++) {
+      ctx->vertices[i][1][0] = rgba[0];
+      ctx->vertices[i][1][1] = rgba[1];
+      ctx->vertices[i][1][2] = rgba[2];
+      ctx->vertices[i][1][3] = rgba[3];
+   }
+}
+
+static void blitter_set_texcoords_2d(struct blitter_context_priv *ctx,
+                                     struct pipe_surface *surf,
+                                     unsigned x1, unsigned y1,
+                                     unsigned x2, unsigned y2)
+{
+   int i;
+   float s1 = x1 / (float)surf->width;
+   float t1 = y1 / (float)surf->height;
+   float s2 = x2 / (float)surf->width;
+   float t2 = y2 / (float)surf->height;
+
+   ctx->vertices[0][1][0] = s1; /*t0.s*/
+   ctx->vertices[0][1][1] = t1; /*t0.t*/
+
+   ctx->vertices[1][1][0] = s2; /*t1.s*/
+   ctx->vertices[1][1][1] = t1; /*t1.t*/
+
+   ctx->vertices[2][1][0] = s2; /*t2.s*/
+   ctx->vertices[2][1][1] = t2; /*t2.t*/
+
+   ctx->vertices[3][1][0] = s1; /*t3.s*/
+   ctx->vertices[3][1][1] = t2; /*t3.t*/
+
+   for (i = 0; i < 4; i++) {
+      ctx->vertices[i][1][2] = 0; /*r*/
+      ctx->vertices[i][1][3] = 1; /*q*/
+   }
+}
+
+static void blitter_set_texcoords_3d(struct blitter_context_priv *ctx,
+                                     struct pipe_surface *surf,
+                                     unsigned x1, unsigned y1,
+                                     unsigned x2, unsigned y2)
+{
+   int i;
+   float depth = u_minify(surf->texture->depth0, surf->level);
+   float r = surf->zslice / depth;
+
+   blitter_set_texcoords_2d(ctx, surf, x1, y1, x2, y2);
+
+   for (i = 0; i < 4; i++)
+      ctx->vertices[i][1][2] = r; /*r*/
+}
+
+static void blitter_set_texcoords_cube(struct blitter_context_priv *ctx,
+                                       struct pipe_surface *surf,
+                                       unsigned x1, unsigned y1,
+                                       unsigned x2, unsigned y2)
+{
+   int i;
+   float s1 = x1 / (float)surf->width;
+   float t1 = y1 / (float)surf->height;
+   float s2 = x2 / (float)surf->width;
+   float t2 = y2 / (float)surf->height;
+   const float st[4][2] = {
+      {s1, t1}, {s2, t1}, {s2, t2}, {s1, t2}
+   };
+
+   util_map_texcoords2d_onto_cubemap(surf->face,
+                                     /* pointer, stride in floats */
+                                     &st[0][0], 2,
+                                     &ctx->vertices[0][1][0], 8);
+
+   for (i = 0; i < 4; i++)
+      ctx->vertices[i][1][3] = 1; /*q*/
+}
+
+static void blitter_draw_quad(struct blitter_context_priv *ctx)
+{
+   struct blitter_context *blitter = &ctx->blitter;
+   struct pipe_context *pipe = ctx->pipe;
+
+   if (blitter->draw_quad) {
+      blitter->draw_quad(pipe, &ctx->vertices[0][0][0]);
+   } else {
+      /* write vertices and draw them */
+      pipe_buffer_write(pipe->screen, ctx->vbuf,
+                        0, sizeof(ctx->vertices), ctx->vertices);
+
+      util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, 0, PIPE_PRIM_TRIANGLE_FAN,
+                              4,  /* verts */
+                              2); /* attribs/vert */
+   }
+}
+
+void util_blitter_clear(struct blitter_context *blitter,
+                        unsigned width, unsigned height,
+                        unsigned num_cbufs,
+                        unsigned clear_buffers,
+                        const float *rgba,
+                        double depth, unsigned stencil)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->pipe;
+
+   assert(num_cbufs <= 8);
+
+   blitter_check_saved_CSOs(ctx);
+
+   /* bind CSOs */
+   if (clear_buffers & PIPE_CLEAR_COLOR)
+      pipe->bind_blend_state(pipe, ctx->blend_write_color);
+   else
+      pipe->bind_blend_state(pipe, ctx->blend_keep_color);
+
+   if (clear_buffers & PIPE_CLEAR_DEPTHSTENCIL)
+      pipe->bind_depth_stencil_alpha_state(pipe,
+         ctx->dsa_write_depth_stencil[stencil&0xff]);
+   else
+      pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
+
+   pipe->bind_rasterizer_state(pipe, ctx->rs_state);
+   pipe->bind_fs_state(pipe, ctx->fs_col[num_cbufs ? num_cbufs-1 : 0]);
+   pipe->bind_vs_state(pipe, ctx->vs_col);
+
+   blitter_set_clear_color(ctx, rgba);
+   blitter_set_rectangle(ctx, 0, 0, width, height, depth);
+   blitter_draw_quad(ctx);
+   blitter_restore_CSOs(ctx);
+}
+
+void util_blitter_copy(struct blitter_context *blitter,
+                       struct pipe_surface *dst,
+                       unsigned dstx, unsigned dsty,
+                       struct pipe_surface *src,
+                       unsigned srcx, unsigned srcy,
+                       unsigned width, unsigned height,
+                       boolean ignore_stencil)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->pipe;
+   struct pipe_screen *screen = pipe->screen;
+   struct pipe_framebuffer_state fb_state;
+   boolean is_stencil, is_depth;
+   unsigned dst_tex_usage;
+
+   /* give up if textures are not set */
+   assert(dst->texture && src->texture);
+   if (!dst->texture || !src->texture)
+      return;
+
+   is_depth = pf_get_component_bits(src->format, PIPE_FORMAT_COMP_Z) != 0;
+   is_stencil = pf_get_component_bits(src->format, PIPE_FORMAT_COMP_S) != 0;
+   dst_tex_usage = is_depth || is_stencil ? PIPE_TEXTURE_USAGE_DEPTH_STENCIL :
+                                            PIPE_TEXTURE_USAGE_RENDER_TARGET;
+
+   /* check if we can sample from and render to the surfaces */
+   /* (assuming copying a stencil buffer is not possible) */
+   if ((!ignore_stencil && is_stencil) ||
+       !screen->is_format_supported(screen, dst->format, dst->texture->target,
+                                    dst_tex_usage, 0) ||
+       !screen->is_format_supported(screen, src->format, src->texture->target,
+                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
+      util_surface_copy(pipe, FALSE, dst, dstx, dsty, src, srcx, srcy,
+                        width, height);
+      return;
+   }
+
+   /* check whether the states are properly saved */
+   blitter_check_saved_CSOs(ctx);
+   assert(blitter->saved_fb_state.nr_cbufs != ~0);
+   assert(blitter->saved_num_textures != ~0);
+   assert(blitter->saved_num_sampler_states != ~0);
+   assert(src->texture->target < 4);
+
+   /* bind CSOs */
+   fb_state.width = dst->width;
+   fb_state.height = dst->height;
+
+   if (is_depth) {
+      pipe->bind_blend_state(pipe, ctx->blend_keep_color);
+      pipe->bind_depth_stencil_alpha_state(pipe,
+                                           ctx->dsa_write_depth_keep_stencil);
+      pipe->bind_fs_state(pipe, ctx->fs_texfetch_depth[src->texture->target]);
+
+      fb_state.nr_cbufs = 0;
+      fb_state.zsbuf = dst;
+   } else {
+      pipe->bind_blend_state(pipe, ctx->blend_write_color);
+      pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
+      pipe->bind_fs_state(pipe, ctx->fs_texfetch_col[src->texture->target]);
+
+      fb_state.nr_cbufs = 1;
+      fb_state.cbufs[0] = dst;
+      fb_state.zsbuf = 0;
+   }
+   pipe->bind_rasterizer_state(pipe, ctx->rs_state);
+   pipe->bind_vs_state(pipe, ctx->vs_tex);
+   pipe->bind_fragment_sampler_states(pipe, 1, &ctx->sampler_state[src->level]);
+   pipe->set_fragment_sampler_textures(pipe, 1, &src->texture);
+   pipe->set_framebuffer_state(pipe, &fb_state);
+
+   /* set texture coordinates */
+   switch (src->texture->target) {
+      case PIPE_TEXTURE_1D:
+      case PIPE_TEXTURE_2D:
+         blitter_set_texcoords_2d(ctx, src, srcx, srcy,
+                                  srcx+width, srcy+height);
+         break;
+      case PIPE_TEXTURE_3D:
+         blitter_set_texcoords_3d(ctx, src, srcx, srcy,
+                                  srcx+width, srcy+height);
+         break;
+      case PIPE_TEXTURE_CUBE:
+         blitter_set_texcoords_cube(ctx, src, srcx, srcy,
+                                    srcx+width, srcy+height);
+         break;
+   }
+
+   blitter_set_rectangle(ctx, dstx, dsty, dstx+width, dsty+height, 0);
+   blitter_draw_quad(ctx);
+   blitter_restore_CSOs(ctx);
+}
+
+void util_blitter_fill(struct blitter_context *blitter,
+                       struct pipe_surface *dst,
+                       unsigned dstx, unsigned dsty,
+                       unsigned width, unsigned height,
+                       unsigned value)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->pipe;
+   struct pipe_screen *screen = pipe->screen;
+   struct pipe_framebuffer_state fb_state;
+   float rgba[4];
+   ubyte ub_rgba[4] = {0};
+   union util_color color;
+   int i;
+
+   assert(dst->texture);
+   if (!dst->texture)
+      return;
+
+   /* check if we can render to the surface */
+   if (pf_is_depth_or_stencil(dst->format) || /* unlikely, but you never know */
+       !screen->is_format_supported(screen, dst->format, dst->texture->target,
+                                    PIPE_TEXTURE_USAGE_RENDER_TARGET, 0)) {
+      util_surface_fill(pipe, dst, dstx, dsty, width, height, value);
+      return;
+   }
+
+   /* unpack the color */
+   color.ui = value;
+   util_unpack_color_ub(dst->format, &color,
+                        ub_rgba, ub_rgba+1, ub_rgba+2, ub_rgba+3);
+   for (i = 0; i < 4; i++)
+      rgba[i] = ubyte_to_float(ub_rgba[i]);
+
+   /* check the saved state */
+   blitter_check_saved_CSOs(ctx);
+   assert(blitter->saved_fb_state.nr_cbufs != ~0);
+
+   /* bind CSOs */
+   pipe->bind_blend_state(pipe, ctx->blend_write_color);
+   pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
+   pipe->bind_rasterizer_state(pipe, ctx->rs_state);
+   pipe->bind_fs_state(pipe, ctx->fs_col[0]);
+   pipe->bind_vs_state(pipe, ctx->vs_col);
+
+   /* set a framebuffer state */
+   fb_state.width = dst->width;
+   fb_state.height = dst->height;
+   fb_state.nr_cbufs = 1;
+   fb_state.cbufs[0] = dst;
+   fb_state.zsbuf = 0;
+   pipe->set_framebuffer_state(pipe, &fb_state);
+
+   blitter_set_clear_color(ctx, rgba);
+   blitter_set_rectangle(ctx, 0, 0, width, height, 0);
+   blitter_draw_quad(ctx);
+   blitter_restore_CSOs(ctx);
+}
diff --git a/src/gallium/auxiliary/util/u_blitter.h b/src/gallium/auxiliary/util/u_blitter.h
new file mode 100644
index 0000000..e4cbb5c
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_blitter.h
@@ -0,0 +1,244 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Marek Olšák <maraeo at gmail.com>
+ *
+ * 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 TUNGSTEN GRAPHICS 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.
+ *
+ **************************************************************************/
+
+#ifndef U_BLITTER_H
+#define U_BLITTER_H
+
+#include "util/u_memory.h"
+
+#include "pipe/p_state.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct pipe_context;
+
+struct blitter_context
+{
+   /**
+    * Draw a quad.
+    *
+    * The pipe driver can set this to provide a more efficient way of drawing
+    * a quad. If it's NULL, the quad is drawn using a vertex buffer.
+    *
+    * There are always 4 vertices with interleaved vertex elements of type
+    * RGBA32F. See the vertex shader _output_ semantics to know what those are.
+    * The primitive type is always PIPE_PRIM_TRIANGLE_FAN and VS/clip/viewport
+    * is bypasssed.
+    */
+   void (*draw_quad)(struct pipe_context *pipe,
+                     const float *vertices);
+
+   /* Private members, really. */
+   void *saved_blend_state;   /**< blend state */
+   void *saved_dsa_state;     /**< depth stencil alpha state */
+   void *saved_rs_state;      /**< rasterizer state */
+   void *saved_fs, *saved_vs; /**< fragment shader, vertex shader */
+
+   struct pipe_framebuffer_state saved_fb_state;  /**< framebuffer state */
+
+   int saved_num_sampler_states;
+   void *saved_sampler_states[32];
+
+   int saved_num_textures;
+   struct pipe_texture *saved_textures[32]; /* is 32 enough? */
+};
+
+/**
+ * Create a blitter context.
+ */
+struct blitter_context *util_blitter_create(struct pipe_context *pipe);
+
+/**
+ * Destroy a blitter context.
+ */
+void util_blitter_destroy(struct blitter_context *blitter);
+
+/*
+ * These CSOs must be saved before any of the following functions is called:
+ * - blend state
+ * - depth stencil alpha state
+ * - rasterizer state
+ * - vertex shader
+ * - fragment shader
+ */
+
+/**
+ * Clear a specified set of currently bound buffers to specified values.
+ */
+void util_blitter_clear(struct blitter_context *blitter,
+                        unsigned width, unsigned height,
+                        unsigned num_cbufs,
+                        unsigned clear_buffers,
+                        const float *rgba,
+                        double depth, unsigned stencil);
+
+/**
+ * Copy a block of pixels from one surface to another.
+ *
+ * You can copy from any color format to any other color format provided
+ * the former can be sampled and the latter can be rendered to. Otherwise,
+ * a software fallback path is taken and both surfaces must be of the same
+ * format.
+ *
+ * The same holds for depth-stencil formats with the exception that stencil
+ * cannot be copied unless you set ignore_stencil to FALSE. In that case,
+ * a software fallback path is taken and both surfaces must be of the same
+ * format.
+ *
+ * Use pipe_screen->is_format_supported to know your options.
+ *
+ * These states must be saved in the blitter in addition to the state objects
+ * already required to be saved:
+ * - framebuffer state
+ * - fragment sampler states
+ * - fragment sampler textures
+ */
+void util_blitter_copy(struct blitter_context *blitter,
+                       struct pipe_surface *dst,
+                       unsigned dstx, unsigned dsty,
+                       struct pipe_surface *src,
+                       unsigned srcx, unsigned srcy,
+                       unsigned width, unsigned height,
+                       boolean ignore_stencil);
+
+/**
+ * Fill a region of a surface with a constant value.
+ *
+ * If the surface cannot be rendered to or it's a depth-stencil format,
+ * a software fallback path is taken.
+ *
+ * These states must be saved in the blitter in addition to the state objects
+ * already required to be saved:
+ * - framebuffer state
+ */
+void util_blitter_fill(struct blitter_context *blitter,
+                       struct pipe_surface *dst,
+                       unsigned dstx, unsigned dsty,
+                       unsigned width, unsigned height,
+                       unsigned value);
+
+/**
+ * Copy all pixels from one surface to another.
+ *
+ * The rules are the same as in util_blitter_copy with the addition that
+ * surfaces must have the same size.
+ */
+static INLINE
+void util_blitter_copy_surface(struct blitter_context *blitter,
+                               struct pipe_surface *dst,
+                               struct pipe_surface *src,
+                               boolean ignore_stencil)
+{
+   assert(dst->width == src->width && dst->height == src->height);
+
+   util_blitter_copy(blitter, dst, 0, 0, src, 0, 0, src->width, src->height,
+                     ignore_stencil);
+}
+
+
+/* The functions below should be used to save currently bound constant state
+ * objects inside a driver. The objects are automatically restored at the end
+ * of the util_blitter_{clear, fill, copy, copy_surface} functions and then
+ * forgotten.
+ *
+ * CSOs not listed here are not affected by util_blitter. */
+
+static INLINE
+void util_blitter_save_blend(struct blitter_context *blitter,
+                             void *state)
+{
+   blitter->saved_blend_state = state;
+}
+
+static INLINE
+void util_blitter_save_depth_stencil_alpha(struct blitter_context *blitter,
+                                           void *state)
+{
+   blitter->saved_dsa_state = state;
+}
+
+static INLINE
+void util_blitter_save_rasterizer(struct blitter_context *blitter,
+                                  void *state)
+{
+   blitter->saved_rs_state = state;
+}
+
+static INLINE
+void util_blitter_save_fragment_shader(struct blitter_context *blitter,
+                                       void *fs)
+{
+   blitter->saved_fs = fs;
+}
+
+static INLINE
+void util_blitter_save_vertex_shader(struct blitter_context *blitter,
+                                     void *vs)
+{
+   blitter->saved_vs = vs;
+}
+
+static INLINE
+void util_blitter_save_framebuffer(struct blitter_context *blitter,
+                                   struct pipe_framebuffer_state *state)
+{
+   blitter->saved_fb_state = *state;
+}
+
+static INLINE
+void util_blitter_save_fragment_sampler_states(
+                  struct blitter_context *blitter,
+                  int num_sampler_states,
+                  void **sampler_states)
+{
+   assert(num_sampler_states <= Elements(blitter->saved_sampler_states));
+
+   blitter->saved_num_sampler_states = num_sampler_states;
+   memcpy(blitter->saved_sampler_states, sampler_states,
+          num_sampler_states * sizeof(void *));
+}
+
+static INLINE
+void util_blitter_save_fragment_sampler_textures(
+                  struct blitter_context *blitter,
+                  int num_textures,
+                  struct pipe_texture **textures)
+{
+   assert(num_textures <= Elements(blitter->saved_textures));
+
+   blitter->saved_num_textures = num_textures;
+   memcpy(blitter->saved_textures, textures,
+          num_textures * sizeof(struct pipe_texture *));
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif



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