st_cb_clear.c File Reference

Include dependency graph for st_cb_clear.c:

Go to the source code of this file.

Functions
void	st_init_clear (struct st_context *st)
void	st_destroy_clear (struct st_context *st)
static GLboolean	is_depth_stencil_format (enum pipe_format pipeFormat)
static void	draw_quad (GLcontext *ctx, float x0, float y0, float x1, float y1, GLfloat z, const GLfloat color[4])
	Draw a screen-aligned quadrilateral.
static void	clear_with_quad (GLcontext *ctx, GLboolean color, GLboolean depth, GLboolean stencil)
	Do glClear by drawing a quadrilateral.
static GLboolean	check_clear_color_with_quad (GLcontext *ctx, struct gl_renderbuffer *rb)
	Determine if we need to clear the depth buffer by drawing a quad.
static GLboolean	check_clear_depth_stencil_with_quad (GLcontext *ctx, struct gl_renderbuffer *rb)
static GLboolean	check_clear_depth_with_quad (GLcontext *ctx, struct gl_renderbuffer *rb)
	Determine if we need to clear the depth buffer by drawing a quad.
static GLboolean	check_clear_stencil_with_quad (GLcontext *ctx, struct gl_renderbuffer *rb)
	Determine if we need to clear the stencil buffer by drawing a quad.
static void	clear_color_buffer (GLcontext *ctx, struct gl_renderbuffer *rb)
static void	clear_depth_buffer (GLcontext *ctx, struct gl_renderbuffer *rb)
static void	clear_stencil_buffer (GLcontext *ctx, struct gl_renderbuffer *rb)
static void	clear_depth_stencil_buffer (GLcontext *ctx, struct gl_renderbuffer *rb)
void	st_flush_clear (struct st_context *st)
static void	st_clear (GLcontext *ctx, GLbitfield mask)
	Called via ctx->Driver.Clear() XXX: doesn't pick up the differences between front/back/left/right clears.
void	st_init_clear_functions (struct dd_function_table *functions)

---

Function Documentation

static GLboolean check_clear_color_with_quad	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Determine if we need to clear the depth buffer by drawing a quad.

Definition at line 320 of file st_cb_clear.c.

References FALSE, PIPE_SURFACE_STATUS_UNDEFINED, st_renderbuffer(), pipe_surface::status, st_renderbuffer::surface, and TRUE.

{
   const struct st_renderbuffer *strb = st_renderbuffer(rb);

   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
      return FALSE;

   if (ctx->Scissor.Enabled)
      return TRUE;

   if (!ctx->Color.ColorMask[0] ||
       !ctx->Color.ColorMask[1] ||
       !ctx->Color.ColorMask[2] ||
       !ctx->Color.ColorMask[3])
      return TRUE;

   return FALSE;
}

static GLboolean check_clear_depth_stencil_with_quad	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Definition at line 341 of file st_cb_clear.c.

References FALSE, PIPE_SURFACE_STATUS_UNDEFINED, st_renderbuffer(), pipe_surface::status, st_renderbuffer::surface, and TRUE.

{
   const struct st_renderbuffer *strb = st_renderbuffer(rb);
   const GLuint stencilMax = (1 << rb->StencilBits) - 1;
   GLboolean maskStencil
      = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;

   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
      return FALSE;

   if (ctx->Scissor.Enabled)
      return TRUE;

   if (maskStencil)
      return TRUE;

   return FALSE;
}

static GLboolean check_clear_depth_with_quad	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Determine if we need to clear the depth buffer by drawing a quad.

Definition at line 365 of file st_cb_clear.c.

References FALSE, pipe_surface::format, is_depth_stencil_format(), PIPE_SURFACE_STATUS_DEFINED, PIPE_SURFACE_STATUS_UNDEFINED, st_renderbuffer(), pipe_surface::status, st_renderbuffer::surface, and TRUE.

{
   const struct st_renderbuffer *strb = st_renderbuffer(rb);
   const GLboolean isDS = is_depth_stencil_format(strb->surface->format);

   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
      return FALSE;

   if (ctx->Scissor.Enabled)
      return TRUE;

   if (isDS && 
       strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
       ctx->DrawBuffer->Visual.stencilBits > 0)
      return TRUE;

   return FALSE;
}

static GLboolean check_clear_stencil_with_quad	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Determine if we need to clear the stencil buffer by drawing a quad.

Definition at line 389 of file st_cb_clear.c.

References FALSE, pipe_surface::format, is_depth_stencil_format(), PIPE_SURFACE_STATUS_DEFINED, PIPE_SURFACE_STATUS_UNDEFINED, st_renderbuffer(), pipe_surface::status, st_renderbuffer::surface, and TRUE.

{
   const struct st_renderbuffer *strb = st_renderbuffer(rb);
   const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
   const GLuint stencilMax = (1 << rb->StencilBits) - 1;
   const GLboolean maskStencil
      = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;

   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
      return FALSE;

   if (maskStencil) 
      return TRUE;

   if (ctx->Scissor.Enabled)
      return TRUE;

   /* This is correct, but it is necessary to look at the depth clear
    * value held in the surface when it comes time to issue the clear,
    * rather than taking depth and stencil clear values from the
    * current state.
    */
   if (isDS && 
       strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
       ctx->DrawBuffer->Visual.depthBits > 0)
      return TRUE;

   return FALSE;
}

static void clear_color_buffer	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Definition at line 422 of file st_cb_clear.c.

References check_clear_color_with_quad(), clear_with_quad(), PIPE_FORMAT_A8R8G8B8_UNORM, st_renderbuffer(), st_renderbuffer::surface, and util_pack_color().

{
   struct st_renderbuffer *strb = st_renderbuffer(rb);

   if (!strb->surface)
      return;

   if (check_clear_color_with_quad( ctx, rb )) {
      /* masking or scissoring */
      clear_with_quad(ctx, GL_TRUE, GL_FALSE, GL_FALSE);
   }
   else {
      /* clear whole buffer w/out masking */
      uint clearValue;
      /* NOTE: we always pass the clear color as PIPE_FORMAT_A8R8G8B8_UNORM
       * at this time!
       */
      util_pack_color(ctx->Color.ClearColor, PIPE_FORMAT_A8R8G8B8_UNORM, &clearValue);
      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
   }
}

static void clear_depth_buffer	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Definition at line 446 of file st_cb_clear.c.

References check_clear_depth_with_quad(), clear_with_quad(), pipe_surface::format, st_renderbuffer(), st_renderbuffer::surface, and util_pack_z().

{
   struct st_renderbuffer *strb = st_renderbuffer(rb);

   if (!strb->surface)
      return;

   if (check_clear_depth_with_quad(ctx, rb)) {
      /* scissoring or we have a combined depth/stencil buffer */
      clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_FALSE);
   }
   else {
      /* simple clear of whole buffer */
      uint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
   }
}

static void clear_depth_stencil_buffer	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Definition at line 495 of file st_cb_clear.c.

References assert, check_clear_depth_stencil_with_quad(), clear_with_quad(), pipe_surface::format, PIPE_FORMAT_S8Z24_UNORM, PIPE_FORMAT_Z24S8_UNORM, st_renderbuffer(), st_renderbuffer::surface, and util_pack_z().

{
   struct st_renderbuffer *strb = st_renderbuffer(rb);

   if (!strb->surface)
      return;

   if (check_clear_depth_stencil_with_quad(ctx, rb)) {
      /* masking or scissoring */
      clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_TRUE);
   }
   else {
      /* clear whole buffer w/out masking */
      GLuint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);

      switch (strb->surface->format) {
      case PIPE_FORMAT_S8Z24_UNORM:
         clearValue |= ctx->Stencil.Clear << 24;
         break;
      case PIPE_FORMAT_Z24S8_UNORM:
         clearValue |= ctx->Stencil.Clear;
         break;
      default:
         assert(0);
      }  

      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
   }
}

static void clear_stencil_buffer	(	GLcontext *	ctx,
		struct gl_renderbuffer *	rb
	)			[static]

Definition at line 466 of file st_cb_clear.c.

References check_clear_stencil_with_quad(), clear_with_quad(), pipe_surface::format, PIPE_FORMAT_S8Z24_UNORM, st_renderbuffer(), and st_renderbuffer::surface.

{
   struct st_renderbuffer *strb = st_renderbuffer(rb);

   if (!strb->surface)
      return;

   if (check_clear_stencil_with_quad(ctx, rb)) {
      /* masking or scissoring or combined depth/stencil buffer */
      clear_with_quad(ctx, GL_FALSE, GL_FALSE, GL_TRUE);
   }
   else {
      /* simple clear of whole buffer */
      GLuint clearValue = ctx->Stencil.Clear;

      switch (strb->surface->format) {
      case PIPE_FORMAT_S8Z24_UNORM:
         clearValue <<= 24;
         break;
      default:
         ; /* no-op, stencil value is in least significant bits */
      }  

      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
   }
}

static void clear_with_quad	(	GLcontext *	ctx,
		GLboolean	color,
		GLboolean	depth,
		GLboolean	stencil
	)			[static]

Do glClear by drawing a quadrilateral.

The vertices of the quad will be computed from the ctx->DrawBuffer->_X/Ymin/max fields.

Definition at line 217 of file st_cb_clear.c.

References pipe_blend_state::alpha_dst_factor, pipe_blend_state::alpha_src_factor, st_context::clear, pipe_blend_state::colormask, st_context::cso_context, cso_restore_blend(), cso_restore_depth_stencil_alpha(), cso_restore_fragment_shader(), cso_restore_rasterizer(), cso_restore_vertex_shader(), cso_restore_viewport(), cso_save_blend(), cso_save_depth_stencil_alpha(), cso_save_fragment_shader(), cso_save_rasterizer(), cso_save_vertex_shader(), cso_save_viewport(), cso_set_blend(), cso_set_depth_stencil_alpha(), cso_set_fragment_shader_handle(), cso_set_rasterizer(), cso_set_vertex_shader_handle(), cso_set_viewport(), st_context::ctx, pipe_depth_stencil_alpha_state::depth, pipe_blend_state::dither, draw_quad(), pipe_stencil_state::enabled, pipe_depth_state::enabled, pipe_stencil_state::fail_op, st_context::fs, pipe_stencil_state::func, pipe_depth_state::func, PIPE_BLENDFACTOR_ONE, PIPE_BLENDFACTOR_ZERO, PIPE_FUNC_ALWAYS, PIPE_MASK_A, PIPE_MASK_B, PIPE_MASK_G, PIPE_MASK_R, PIPE_STENCIL_OP_REPLACE, st_context::raster, pipe_stencil_state::ref_value, pipe_blend_state::rgb_dst_factor, pipe_blend_state::rgb_src_factor, st_fb_orientation(), pipe_depth_stencil_alpha_state::stencil, pipe_stencil_state::value_mask, st_context::viewport, st_context::vs, pipe_stencil_state::write_mask, pipe_depth_state::writemask, Y_0_TOP, pipe_stencil_state::zfail_op, and pipe_stencil_state::zpass_op.

{
   struct st_context *st = ctx->st;
   const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin;
   const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax;
   GLfloat y0, y1;

   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
      y0 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax);
      y1 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin);
   }
   else {
      y0 = (GLfloat) ctx->DrawBuffer->_Ymin;
      y1 = (GLfloat) ctx->DrawBuffer->_Ymax;
   }

   /*
   printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__, 
          color ? "color, " : "",
          depth ? "depth, " : "",
          stencil ? "stencil" : "",
          x0, y0,
          x1, y1);
   */

   cso_save_blend(st->cso_context);
   cso_save_depth_stencil_alpha(st->cso_context);
   cso_save_rasterizer(st->cso_context);
   cso_save_viewport(st->cso_context);
   cso_save_fragment_shader(st->cso_context);
   cso_save_vertex_shader(st->cso_context);

   /* blend state: RGBA masking */
   {
      struct pipe_blend_state blend;
      memset(&blend, 0, sizeof(blend));
      blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
      blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
      blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
      blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
      if (color) {
         if (ctx->Color.ColorMask[0])
            blend.colormask |= PIPE_MASK_R;
         if (ctx->Color.ColorMask[1])
            blend.colormask |= PIPE_MASK_G;
         if (ctx->Color.ColorMask[2])
            blend.colormask |= PIPE_MASK_B;
         if (ctx->Color.ColorMask[3])
            blend.colormask |= PIPE_MASK_A;
         if (st->ctx->Color.DitherFlag)
            blend.dither = 1;
      }
      cso_set_blend(st->cso_context, &blend);
   }

   /* depth_stencil state: always pass/set to ref value */
   {
      struct pipe_depth_stencil_alpha_state depth_stencil;
      memset(&depth_stencil, 0, sizeof(depth_stencil));
      if (depth) {
         depth_stencil.depth.enabled = 1;
         depth_stencil.depth.writemask = 1;
         depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
      }

      if (stencil) {
         depth_stencil.stencil[0].enabled = 1;
         depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
         depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
         depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
         depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
         depth_stencil.stencil[0].ref_value = ctx->Stencil.Clear;
         depth_stencil.stencil[0].value_mask = 0xff;
         depth_stencil.stencil[0].write_mask = ctx->Stencil.WriteMask[0] & 0xff;
      }

      cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
   }

   cso_set_rasterizer(st->cso_context, &st->clear.raster);
   cso_set_viewport(st->cso_context, &st->clear.viewport);

   cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
   cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);

   /* draw quad matching scissor rect (XXX verify coord round-off) */
   draw_quad(ctx, x0, y0, x1, y1, (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);

   /* Restore pipe state */
   cso_restore_blend(st->cso_context);
   cso_restore_depth_stencil_alpha(st->cso_context);
   cso_restore_rasterizer(st->cso_context);
   cso_restore_viewport(st->cso_context);
   cso_restore_fragment_shader(st->cso_context);
   cso_restore_vertex_shader(st->cso_context);
}

static void draw_quad	(	GLcontext *	ctx,
		float	x0,
		float	y0,
		float	x1,
		float	y1,
		GLfloat	z,
		const GLfloat	color[4]
	)			[static]

Draw a screen-aligned quadrilateral.

Coords are window coords with y=0=bottom. These coords will be transformed by the vertex shader and viewport transform (which will flip Y if needed).

Definition at line 145 of file st_cb_clear.c.

References st_context::clear, st_context::pipe, pipe_buffer_create(), pipe_buffer_map(), pipe_buffer_reference(), pipe_buffer_unmap(), PIPE_BUFFER_USAGE_CPU_WRITE, PIPE_BUFFER_USAGE_VERTEX, PIPE_PRIM_TRIANGLE_FAN, pipe_context::screen, util_draw_vertex_buffer(), st_context::vbuf, st_context::vbuf_slot, and st_context::vertices.

{
   struct st_context *st = ctx->st;
   struct pipe_context *pipe = st->pipe;
   const GLuint max_slots = 1024 / sizeof(st->clear.vertices);
   GLuint i;
   void *buf;

   if (st->clear.vbuf_slot >= max_slots) {
      pipe_buffer_reference(pipe->screen, &st->clear.vbuf, NULL);
      st->clear.vbuf_slot = 0;
   }

   if (!st->clear.vbuf) {
      st->clear.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
                                          max_slots * sizeof(st->clear.vertices));
   }

   /* positions */
   st->clear.vertices[0][0][0] = x0;
   st->clear.vertices[0][0][1] = y0;

   st->clear.vertices[1][0][0] = x1;
   st->clear.vertices[1][0][1] = y0;

   st->clear.vertices[2][0][0] = x1;
   st->clear.vertices[2][0][1] = y1;

   st->clear.vertices[3][0][0] = x0;
   st->clear.vertices[3][0][1] = y1;

   /* same for all verts: */
   for (i = 0; i < 4; i++) {
      st->clear.vertices[i][0][2] = z;
      st->clear.vertices[i][0][3] = 1.0;
      st->clear.vertices[i][1][0] = color[0];
      st->clear.vertices[i][1][1] = color[1];
      st->clear.vertices[i][1][2] = color[2];
      st->clear.vertices[i][1][3] = color[3];
   }

   /* put vertex data into vbuf */
   buf = pipe_buffer_map(pipe->screen, st->clear.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);

   memcpy((char *)buf + st->clear.vbuf_slot * sizeof(st->clear.vertices), 
          st->clear.vertices, 
          sizeof(st->clear.vertices));

   pipe_buffer_unmap(pipe->screen, st->clear.vbuf);

   /* draw */
   util_draw_vertex_buffer(pipe, 
                           st->clear.vbuf, 
                           st->clear.vbuf_slot * sizeof(st->clear.vertices),
                           PIPE_PRIM_TRIANGLE_FAN,
                           4,  /* verts */
                           2); /* attribs/vert */

   /* Increment slot */
   st->clear.vbuf_slot++;
}

static GLboolean is_depth_stencil_format

(

enum pipe_format

pipeFormat

)

[static]

Definition at line 126 of file st_cb_clear.c.

References PIPE_FORMAT_S8Z24_UNORM, and PIPE_FORMAT_Z24S8_UNORM.

{
   switch (pipeFormat) {
   case PIPE_FORMAT_S8Z24_UNORM:
   case PIPE_FORMAT_Z24S8_UNORM:
      return GL_TRUE;
   default:
      return GL_FALSE;
   }
}

static void st_clear	(	GLcontext *	ctx,
		GLbitfield	mask
	)			[static]

Called via ctx->Driver.Clear() XXX: doesn't pick up the differences between front/back/left/right clears.

Need to sort that out...

Definition at line 542 of file st_cb_clear.c.

References assert, clear_color_buffer(), clear_depth_buffer(), clear_depth_stencil_buffer(), clear_stencil_buffer(), st_clear_accum_buffer(), and st_validate_state().

{
   static const GLbitfield BUFFER_BITS_DS
      = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
   struct st_context *st = ctx->st;
   struct gl_renderbuffer *depthRb
      = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
   struct gl_renderbuffer *stencilRb
      = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
   GLbitfield cmask = mask & BUFFER_BITS_COLOR;

   /* This makes sure the softpipe has the latest scissor, etc values */
   st_validate_state( st );

   /*
    * XXX TO-DO:
    * If we're going to use clear_with_quad() for any reason, use it to
    * clear as many other buffers as possible.
    * As it is now, we sometimes call clear_with_quad() three times to clear
    * color/depth/stencil individually...
    */

   if (cmask) {
      GLuint b;
      for (b = 0; cmask; b++) {
         if (cmask & (1 << b)) {
            struct gl_renderbuffer *rb
               = ctx->DrawBuffer->Attachment[b].Renderbuffer;
            assert(rb);
            clear_color_buffer(ctx, rb);
            cmask &= ~(1 << b); /* turn off bit */
         }
         assert(b < BUFFER_COUNT);
      }
   }

   if (mask & BUFFER_BIT_ACCUM) {
      st_clear_accum_buffer(ctx,
                       ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
   }

   if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
      /* clearing combined depth + stencil */
      clear_depth_stencil_buffer(ctx, depthRb);
   }
   else {
      /* separate depth/stencil clears */
      if (mask & BUFFER_BIT_DEPTH) {
         clear_depth_buffer(ctx, depthRb);
      }
      if (mask & BUFFER_BIT_STENCIL) {
         clear_stencil_buffer(ctx, stencilRb);
      }
   }
}

void st_destroy_clear

(

struct st_context *

st

)

Definition at line 96 of file st_cb_clear.c.

References st_context::clear, st_context::cso_context, cso_delete_fragment_shader(), cso_delete_vertex_shader(), st_context::frag_shader, st_context::fs, st_context::pipe, pipe_buffer_reference(), pipe_context::screen, pipe_shader_state::tokens, util_free_shader(), st_context::vbuf, st_context::vert_shader, and st_context::vs.

{
   struct pipe_context *pipe = st->pipe;

   if (st->clear.vert_shader.tokens) {
      util_free_shader(&st->clear.vert_shader);
      st->clear.vert_shader.tokens = NULL;
   }

   if (st->clear.frag_shader.tokens) {
      util_free_shader(&st->clear.frag_shader);
      st->clear.frag_shader.tokens = NULL;
   }

   if (st->clear.fs) {
      cso_delete_fragment_shader(st->cso_context, st->clear.fs);
      st->clear.fs = NULL;
   }
   if (st->clear.vs) {
      cso_delete_vertex_shader(st->cso_context, st->clear.vs);
      st->clear.vs = NULL;
   }
   if (st->clear.vbuf) {
      pipe_buffer_reference(pipe->screen, &st->clear.vbuf, NULL);
      st->clear.vbuf = NULL;
   }
}

void st_flush_clear

(

struct st_context *

st

)

Definition at line 526 of file st_cb_clear.c.

References st_context::clear, st_context::pipe, pipe_buffer_reference(), pipe_context::screen, st_context::vbuf, and st_context::vbuf_slot.

{
   /* Release vertex buffer to avoid synchronous rendering if we were
    * to map it in the next frame.
    */
   pipe_buffer_reference(st->pipe->screen, &st->clear.vbuf, NULL);
   st->clear.vbuf_slot = 0;
}

void st_init_clear

(

struct st_context *

st

)

Definition at line 59 of file st_cb_clear.c.

References pipe_rasterizer_state::bypass_clipping, st_context::clear, st_context::frag_shader, st_context::fs, pipe_rasterizer_state::gl_rasterization_rules, st_context::pipe, st_context::raster, pipe_viewport_state::scale, semantic_names, TGSI_SEMANTIC_COLOR, TGSI_SEMANTIC_POSITION, pipe_viewport_state::translate, util_make_fragment_passthrough_shader(), util_make_vertex_passthrough_shader(), st_context::vert_shader, st_context::viewport, and st_context::vs.

{
   struct pipe_context *pipe = st->pipe;

   /* rasterizer state: bypass clipping */
   memset(&st->clear.raster, 0, sizeof(st->clear.raster));
   st->clear.raster.gl_rasterization_rules = 1;
   st->clear.raster.bypass_clipping = 1;

   /* viewport state: identity since we're drawing in window coords */
   st->clear.viewport.scale[0] = 1.0;
   st->clear.viewport.scale[1] = 1.0;
   st->clear.viewport.scale[2] = 1.0;
   st->clear.viewport.scale[3] = 1.0;
   st->clear.viewport.translate[0] = 0.0;
   st->clear.viewport.translate[1] = 0.0;
   st->clear.viewport.translate[2] = 0.0;
   st->clear.viewport.translate[3] = 0.0;

   /* fragment shader state: color pass-through program */
   st->clear.fs =
      util_make_fragment_passthrough_shader(pipe, &st->clear.frag_shader);

   /* vertex shader state: color/position pass-through */
   {
      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
                                      TGSI_SEMANTIC_COLOR };
      const uint semantic_indexes[] = { 0, 0 };
      st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
                                                         semantic_names,
                                                         semantic_indexes,
                                                         &st->clear.vert_shader);
   }
}

void st_init_clear_functions

(

struct dd_function_table *

functions

)

Definition at line 599 of file st_cb_clear.c.

References st_clear().

{
   functions->Clear = st_clear;
}

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