i830_metaops.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 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.
 * 
 **************************************************************************/

#include "glheader.h"
#include "enums.h"
#include "mtypes.h"
#include "macros.h"
#include "utils.h"

#include "intel_screen.h"
#include "intel_batchbuffer.h"
#include "intel_ioctl.h"
#include "intel_regions.h"

#include "i830_context.h"
#include "i830_reg.h"

/* A large amount of state doesn't need to be uploaded.
 */
#define ACTIVE (I830_UPLOAD_INVARIENT |         \
		I830_UPLOAD_CTX |		\
		I830_UPLOAD_BUFFERS |		\
		I830_UPLOAD_STIPPLE |		\
		I830_UPLOAD_TEXBLEND(0) |	\
		I830_UPLOAD_TEX(0))


#define SET_STATE( i830, STATE )		\
do {						\
   i830->current->emitted &= ~ACTIVE;			\
   i830->current = &i830->STATE;		\
   i830->current->emitted &= ~ACTIVE;			\
} while (0)


static void
set_no_stencil_write(struct intel_context *intel)
{
   struct i830_context *i830 = i830_context(&intel->ctx);

   /* ctx->Driver.Enable( ctx, GL_STENCIL_TEST, GL_FALSE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_STENCIL_WRITE;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_STENCIL_WRITE;

   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}

static void
set_no_depth_write(struct intel_context *intel)
{
   struct i830_context *i830 = i830_context(&intel->ctx);

   /* ctx->Driver.Enable( ctx, GL_DEPTH_TEST, GL_FALSE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_DEPTH_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_DIS_DEPTH_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_DEPTH_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_DEPTH_WRITE;

   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}

/* Set depth unit to replace.
 */
static void
set_depth_replace(struct intel_context *intel)
{
   struct i830_context *i830 = i830_context(&intel->ctx);

   /* ctx->Driver.Enable( ctx, GL_DEPTH_TEST, GL_FALSE )
    * ctx->Driver.DepthMask( ctx, GL_TRUE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_DEPTH_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_DIS_DEPTH_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_DEPTH_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= ENABLE_DEPTH_WRITE;

   /* ctx->Driver.DepthFunc( ctx, GL_ALWAYS )
    */
   i830->meta.Ctx[I830_CTXREG_STATE3] &= ~DEPTH_TEST_FUNC_MASK;
   i830->meta.Ctx[I830_CTXREG_STATE3] |= (ENABLE_DEPTH_TEST_FUNC |
                                          DEPTH_TEST_FUNC
                                          (COMPAREFUNC_ALWAYS));

   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}


/* Set stencil unit to replace always with the reference value.
 */
static void
set_stencil_replace(struct intel_context *intel,
                    GLuint s_mask, GLuint s_clear)
{
   struct i830_context *i830 = i830_context(&intel->ctx);

   /* ctx->Driver.Enable( ctx, GL_STENCIL_TEST, GL_TRUE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= ENABLE_STENCIL_WRITE;

   /* ctx->Driver.StencilMask( ctx, s_mask )
    */
   i830->meta.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_WRITE_MASK |
                                          STENCIL_WRITE_MASK((s_mask &
                                                              0xff)));

   /* ctx->Driver.StencilOp( ctx, GL_REPLACE, GL_REPLACE, GL_REPLACE )
    */
   i830->meta.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_OPS_MASK);
   i830->meta.Ctx[I830_CTXREG_STENCILTST] |=
      (ENABLE_STENCIL_PARMS |
       STENCIL_FAIL_OP(STENCILOP_REPLACE) |
       STENCIL_PASS_DEPTH_FAIL_OP(STENCILOP_REPLACE) |
       STENCIL_PASS_DEPTH_PASS_OP(STENCILOP_REPLACE));

   /* ctx->Driver.StencilFunc( ctx, GL_ALWAYS, s_clear, ~0 )
    */
   i830->meta.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_TEST_MASK |
                                          STENCIL_TEST_MASK(0xff));

   i830->meta.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_REF_VALUE_MASK |
                                               ENABLE_STENCIL_TEST_FUNC_MASK);
   i830->meta.Ctx[I830_CTXREG_STENCILTST] |=
      (ENABLE_STENCIL_REF_VALUE |
       ENABLE_STENCIL_TEST_FUNC |
       STENCIL_REF_VALUE((s_clear & 0xff)) |
       STENCIL_TEST_FUNC(COMPAREFUNC_ALWAYS));



   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}


static void
set_color_mask(struct intel_context *intel, GLboolean state)
{
   struct i830_context *i830 = i830_context(&intel->ctx);

   const GLuint mask = ((1 << WRITEMASK_RED_SHIFT) |
                        (1 << WRITEMASK_GREEN_SHIFT) |
                        (1 << WRITEMASK_BLUE_SHIFT) |
                        (1 << WRITEMASK_ALPHA_SHIFT));

   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~mask;

   if (state) {
      i830->meta.Ctx[I830_CTXREG_ENABLES_2] |=
         (i830->state.Ctx[I830_CTXREG_ENABLES_2] & mask);
   }

   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}

/* Installs a one-stage passthrough texture blend pipeline.  Is there
 * more that can be done to turn off texturing?
 */
static void
set_no_texture(struct intel_context *intel)
{
   struct i830_context *i830 = i830_context(&intel->ctx);
   static const struct gl_tex_env_combine_state comb = {
      GL_NONE, GL_NONE,
      {GL_TEXTURE, 0, 0,}, {GL_TEXTURE, 0, 0,},
      {GL_SRC_COLOR, 0, 0}, {GL_SRC_ALPHA, 0, 0},
      0, 0, 0, 0
   };

   i830->meta.TexBlendWordsUsed[0] =
      i830SetTexEnvCombine(i830, &comb, 0, TEXBLENDARG_TEXEL0,
                           i830->meta.TexBlend[0], NULL);

   i830->meta.TexBlend[0][0] |= TEXOP_LAST_STAGE;
   i830->meta.emitted &= ~I830_UPLOAD_TEXBLEND(0);
}

/* Set up a single element blend stage for 'replace' texturing with no
 * funny ops.
 */
static void
set_texture_blend_replace(struct intel_context *intel)
{
   struct i830_context *i830 = i830_context(&intel->ctx);
   static const struct gl_tex_env_combine_state comb = {
      GL_REPLACE, GL_REPLACE,
      {GL_TEXTURE, GL_TEXTURE, GL_TEXTURE,}, {GL_TEXTURE, GL_TEXTURE,
                                              GL_TEXTURE,},
      {GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_COLOR}, {GL_SRC_ALPHA, GL_SRC_ALPHA,
                                                   GL_SRC_ALPHA},
      0, 0, 1, 1
   };

   i830->meta.TexBlendWordsUsed[0] =
      i830SetTexEnvCombine(i830, &comb, 0, TEXBLENDARG_TEXEL0,
                           i830->meta.TexBlend[0], NULL);

   i830->meta.TexBlend[0][0] |= TEXOP_LAST_STAGE;
   i830->meta.emitted &= ~I830_UPLOAD_TEXBLEND(0);