fxdd.c

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

/* KW: Put the word Mesa in the render string because quakeworld
 * checks for this rather than doing a glGet(GL_MAX_TEXTURE_SIZE).
 * Why?
 */
static const GLubyte *
fxDDGetString(GLcontext * ctx, GLenum name)
{
 fxMesaContext fxMesa = FX_CONTEXT(ctx);

 switch (name) {
        case GL_RENDERER:
             return (GLubyte *)fxMesa->rendererString;
#if __WIN32__ /* hack to advertise vanilla extension names */
        case GL_EXTENSIONS:
             if (ctx->Extensions.String == NULL) {
                GLubyte *ext = _mesa_make_extension_string(ctx);
                if (ext != NULL) {
                   ctx->Extensions.String = _mesa_malloc(strlen((char *)ext) + 256);
                   if (ctx->Extensions.String != NULL) {
                      strcpy((char *)ctx->Extensions.String, (char *)ext);
                      /* put any additional extension names here */
#if 0
                      strcat((char *)ctx->Extensions.String, " 3DFX_set_global_palette");
#endif
#if __WIN32__
                      strcat((char *)ctx->Extensions.String, " WGL_3DFX_gamma_control");
                      strcat((char *)ctx->Extensions.String, " WGL_EXT_swap_control");
                      strcat((char *)ctx->Extensions.String, " WGL_EXT_extensions_string WGL_ARB_extensions_string");
#endif
                      /* put any additional extension names here */
                      _mesa_free(ext);
                   } else {
                      ctx->Extensions.String = ext;
                   }
                }
             }
             return ctx->Extensions.String;
#endif
        default:
             return NULL;
 }
}

static const struct tnl_pipeline_stage *fx_pipeline[] = {
   &_tnl_vertex_transform_stage,	/* XXX todo - Add the fastpath here */
   &_tnl_normal_transform_stage,
   &_tnl_lighting_stage,
   &_tnl_fog_coordinate_stage,
   &_tnl_texgen_stage,
   &_tnl_texture_transform_stage,
   &_tnl_point_attenuation_stage,
#if defined(FEATURE_NV_vertex_program) || defined(FEATURE_ARB_vertex_program)
   &_tnl_vertex_program_stage,
#endif
   &_tnl_render_stage,
   0,
};




int
fxDDInitFxMesaContext(fxMesaContext fxMesa)
{
   GLcontext *ctx = fxMesa->glCtx;

   FX_setupGrVertexLayout();

   fxMesa->color = 0xffffffff;
   fxMesa->clearC = 0;
   fxMesa->clearA = 0;

   fxMesa->stats.swapBuffer = 0;
   fxMesa->stats.reqTexUpload = 0;
   fxMesa->stats.texUpload = 0;
   fxMesa->stats.memTexUpload = 0;

   fxMesa->tmuSrc = FX_TMU_NONE;
   fxMesa->lastUnitsMode = FX_UM_NONE;
   fxTMInit(fxMesa);

   /* FX units setup */

   fxMesa->unitsState.alphaTestEnabled = GL_FALSE;
   fxMesa->unitsState.alphaTestFunc = GL_ALWAYS;
   fxMesa->unitsState.alphaTestRefValue = 0.0;

   fxMesa->unitsState.blendEnabled = GL_FALSE;
   fxMesa->unitsState.blendSrcFuncRGB = GR_BLEND_ONE;
   fxMesa->unitsState.blendDstFuncRGB = GR_BLEND_ZERO;
   fxMesa->unitsState.blendSrcFuncAlpha = GR_BLEND_ONE;
   fxMesa->unitsState.blendDstFuncAlpha = GR_BLEND_ZERO;
   fxMesa->unitsState.blendEqRGB = GR_BLEND_OP_ADD;
   fxMesa->unitsState.blendEqAlpha = GR_BLEND_OP_ADD;

   fxMesa->unitsState.depthTestEnabled = GL_FALSE;
   fxMesa->unitsState.depthMask = GL_TRUE;
   fxMesa->unitsState.depthTestFunc = GL_LESS;
   fxMesa->unitsState.depthBias = 0;

   fxMesa->unitsState.stencilWriteMask = 0xff;

   if (fxMesa->colDepth == 32) {
      /* 32bpp */
      fxMesa->Glide.grColorMaskExt(FXTRUE, FXTRUE, FXTRUE, fxMesa->haveHwAlpha);
   } else {
      /* 15/16 bpp mode */
      grColorMask(FXTRUE, fxMesa->haveHwAlpha);
   }

   fxMesa->currentFB = fxMesa->haveDoubleBuffer ? GR_BUFFER_BACKBUFFER : GR_BUFFER_FRONTBUFFER;
   grRenderBuffer(fxMesa->currentFB);

   fxMesa->state = MALLOC(FX_grGetInteger(GR_GLIDE_STATE_SIZE));
   fxMesa->fogTable = (GrFog_t *) MALLOC(FX_grGetInteger(GR_FOG_TABLE_ENTRIES) *
			     sizeof(GrFog_t));

   if (!fxMesa->state || !fxMesa->fogTable) {
      if (fxMesa->state)
	 FREE(fxMesa->state);
      if (fxMesa->fogTable)
	 FREE(fxMesa->fogTable);
      return 0;
   }

   if (fxMesa->haveZBuffer) {
      grDepthBufferMode(GR_DEPTHBUFFER_ZBUFFER);
   }

   if (!fxMesa->bgrOrder) {
      grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
   }

   if (fxMesa->Glide.grSetNumPendingBuffers != NULL) {
      fxMesa->Glide.grSetNumPendingBuffers(fxMesa->maxPendingSwapBuffers);
   }

   fxMesa->textureAlign = FX_grGetInteger(GR_TEXTURE_ALIGN);
   /* [koolsmoky] */
   {
    char *env;
    int textureLevels = 0;
    int textureSize = FX_grGetInteger(GR_MAX_TEXTURE_SIZE);
    do {
        textureLevels++;
    } while ((textureSize >>= 0x1) & 0x7ff);
    ctx->Const.MaxTextureLevels = textureLevels;
    ctx->Const.MaxTextureLodBias = /*textureLevels - 1*/8; /* Glide bug */
#if FX_RESCALE_BIG_TEXURES_HACK
    fxMesa->textureMaxLod = textureLevels - 1;
    if ((env = getenv("MESA_FX_MAXLOD")) != NULL) {
       int maxLevels = atoi(env) + 1;
       if ((maxLevels <= MAX_TEXTURE_LEVELS) && (maxLevels > textureLevels)) {
          ctx->Const.MaxTextureLevels = maxLevels;
       }
    }
#endif
   }
   ctx->Const.MaxTextureCoordUnits =
   ctx->Const.MaxTextureImageUnits = fxMesa->haveTwoTMUs ? 2 : 1;
   ctx->Const.MaxTextureUnits = MAX2(ctx->Const.MaxTextureImageUnits, ctx->Const.MaxTextureCoordUnits);

   fxMesa->new_state = _NEW_ALL;
   if (!fxMesa->haveHwStencil) {
      /* don't touch stencil if there is none */
      fxMesa->new_state &= ~FX_NEW_STENCIL;
   }

   /* Initialize the software rasterizer and helper modules.
    */
   _swrast_CreateContext(ctx);
   _vbo_CreateContext(ctx);
   _tnl_CreateContext(ctx);
   _swsetup_CreateContext(ctx);

   /* Install customized pipeline */
   _tnl_destroy_pipeline(ctx);
   _tnl_install_pipeline(ctx, fx_pipeline);

   fxAllocVB(ctx);

   fxSetupDDPointers(ctx);
   fxDDInitTriFuncs(ctx);

   /* Tell the software rasterizer to use pixel fog always.
    */
   _swrast_allow_vertex_fog(ctx, GL_FALSE);
   _swrast_allow_pixel_fog(ctx, GL_TRUE);
   _tnl_allow_vertex_fog( ctx, GL_FALSE );
   _tnl_allow_pixel_fog( ctx, GL_TRUE );

   /* Tell tnl not to calculate or use vertex fog factors.  (Needed to
    * tell render stage not to clip fog coords).
    */
/*     _tnl_calculate_vertex_fog( ctx, GL_FALSE ); */

   fxDDInitExtensions(ctx);

#if 0
   /* do we want dither? It just looks bad... */
   grEnable(GR_ALLOW_MIPMAP_DITHER);
#endif
   grGlideGetState((GrState *) fxMesa->state);

   return 1;
}

/* Undo the above.
 */
void
fxDDDestroyFxMesaContext(fxMesaContext fxMesa)
{
   _swsetup_DestroyContext(fxMesa->glCtx);
   _tnl_DestroyContext(fxMesa->glCtx);
   _vbo_DestroyContext(fxMesa->glCtx);
   _swrast_DestroyContext(fxMesa->glCtx);

   if (fxMesa->state)
      FREE(fxMesa->state);
   if (fxMesa->fogTable)
      FREE(fxMesa->fogTable);
   fxFreeVB(fxMesa->glCtx);
}




void
fxDDInitExtensions(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);

#if 1 /* multipass ColorSum stage */
   _mesa_enable_extension(ctx, "GL_EXT_secondary_color");
#endif

   _mesa_enable_extension(ctx, "GL_ARB_point_sprite");
   _mesa_enable_extension(ctx, "GL_EXT_point_parameters");
   _mesa_enable_extension(ctx, "GL_EXT_paletted_texture");
   _mesa_enable_extension(ctx, "GL_EXT_texture_lod_bias");
   _mesa_enable_extension(ctx, "GL_EXT_shared_texture_palette");
   _mesa_enable_extension(ctx, "GL_EXT_blend_func_separate");
   _mesa_enable_extension(ctx, "GL_EXT_texture_env_add");
   _mesa_enable_extension(ctx, "GL_EXT_stencil_wrap");
   _mesa_enable_extension(ctx, "GL_EXT_stencil_two_side");

   if (fxMesa->haveTwoTMUs) {
      _mesa_enable_extension(ctx, "GL_ARB_multitexture");
   }

   if (fxMesa->type >= GR_SSTTYPE_Voodoo4) {
      _mesa_enable_extension(ctx, "GL_ARB_texture_compression");
      _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
      _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
      _mesa_enable_extension(ctx, "GL_S3_s3tc");
      _mesa_enable_extension(ctx, "GL_NV_blend_square");
   } else {
      /* [dBorca]
       * We should enable generic texture compression functions,
       * but some poorly written apps automatically assume S3TC.
       * Binding NCC to GL_COMPRESSED_RGB[A] is an unnecessary hassle,
       * since it's slow and ugly (better with palette textures, then).
       * Moreover, NCC is not an OpenGL standard, so we can't use
       * precompressed textures. Last, but not least, NCC runs amok
       * when multitexturing on a Voodoo3 and up (see POINTCAST vs UMA).
       * Note: this is also a problem with palette textures, but
       * faking multitex by multipass is evil...
       * Implementing NCC requires three stages:
       * fxDDChooseTextureFormat:
       *    bind GL_COMPRESSED_RGB[A] to _mesa_texformat_argb8888,
       *    so we can quantize properly, at a later time
       * fxDDTexImage:
       *    if GL_COMPRESSED_RGB
       *       use _mesa_texformat_l8 to get 1bpt and set GR_TEXFMT_YIQ_422
       *    if GL_COMPRESSED_RGBA
       *       use _mesa_texformat_al88 to get 2bpt and set GR_TEXFMT_AYIQ_8422
       *    txMipQuantize(...);
       *    if (level == 0) {
       *       txPalToNcc((GuNccTable *)(&(ti->palette)), pxMip.pal);
       *    }
       * fxSetupSingleTMU_NoLock/fxSetupDoubleTMU_NoLock:
       *    grTexDownloadTable(GR_TEXTABLE_NCC0, &(ti->palette));
       */
      /*_mesa_enable_extension(ctx, "GL_ARB_texture_compression");*/
      _mesa_enable_extension(ctx, "GL_SGIS_generate_mipmap");
   }

   if (fxMesa->HaveCmbExt) {
      _mesa_enable_extension(ctx, "GL_ARB_texture_env_combine");
      _mesa_enable_extension(ctx, "GL_EXT_texture_env_combine");
   }

   if (fxMesa->HavePixExt) {
      _mesa_enable_extension(ctx, "GL_EXT_blend_subtract");
      _mesa_enable_extension(ctx, "GL_EXT_blend_equation_separate");
   }

   if (fxMesa->HaveMirExt) {
      _mesa_enable_extension(ctx, "GL_ARB_texture_mirrored_repeat");
   }

   if (fxMesa->type >= GR_SSTTYPE_Voodoo2) {
      _mesa_enable_extension(ctx, "GL_EXT_fog_coord");
   }

   /* core-level extensions */
   _mesa_enable_extension(ctx, "GL_EXT_multi_draw_arrays");
   _mesa_enable_extension(ctx, "GL_IBM_multimode_draw_arrays");
   _mesa_enable_extension(ctx, "GL_ARB_vertex_buffer_object");
   /* dangerous */
   if (getenv("MESA_FX_ALLOW_VP")) {
      _mesa_enable_extension(ctx, "GL_ARB_vertex_program");
      _mesa_enable_extension(ctx, "GL_NV_vertex_program");
      _mesa_enable_extension(ctx, "GL_NV_vertex_program1_1");
      _mesa_enable_extension(ctx, "GL_MESA_program_debug");
   }
#if 0
   /* this requires _tnl_vertex_cull_stage in the pipeline */
   _mesa_enable_extension(ctx, "EXT_cull_vertex");
#endif
}


/************************************************************************/
/************************************************************************/
/************************************************************************/

/* Check if the hardware supports the current context
 *
 * Performs similar work to fxDDChooseRenderState() - should be merged.
 */
GLuint
fx_check_IsInHardware(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);

   if (ctx->RenderMode != GL_RENDER) {
      return FX_FALLBACK_RENDER_MODE;
   }

   if (ctx->Stencil.Enabled && !fxMesa->haveHwStencil) {
      return FX_FALLBACK_STENCIL;
   }

   if ((ctx->DrawBuffer->_ColorDrawBufferIndexes[0] != BUFFER_BIT_FRONT_LEFT) &&
       (ctx->DrawBuffer->_ColorDrawBufferIndexes[0] != BUFFER_BIT_BACK_LEFT)) {
      return FX_FALLBACK_DRAW_BUFFER;
   }

   if (ctx->Color.BlendEnabled) {
      if (ctx->Color.BlendEquationRGB != GL_FUNC_ADD) {
         if (!fxMesa->HavePixExt ||
             ((ctx->Color.BlendEquationRGB != GL_FUNC_SUBTRACT) &&
              (ctx->Color.BlendEquationRGB != GL_FUNC_REVERSE_SUBTRACT))) {
            return FX_FALLBACK_BLEND;
         }
      }

      if (ctx->Color.BlendEquationA != GL_FUNC_ADD) {
         if (!fxMesa->HavePixExt ||
             ((ctx->Color.BlendEquationA != GL_FUNC_SUBTRACT) &&
              (ctx->Color.BlendEquationA != GL_FUNC_REVERSE_SUBTRACT))) {
            return FX_FALLBACK_BLEND;
         }
      }

#if 0
      /* [dBorca]
       * We fail the spec here, unless certain blending modes:
       * RGB: (GL_ONE + GL_*) or (GL_ZERO + GL_*) or ...
       */
      if (NEED_SECONDARY_COLOR(ctx)) {
         if ((ctx->Color.BlendEquationRGB != GL_FUNC_ADD) &&
             (ctx->Color.BlendSrcRGB != GL_ONE)) {
            /* Can't use multipass to blend ColorSum stage */
            return FX_FALLBACK_SPECULAR;
         }
      }
#endif
   }

   /* [dBorca]
    * We could avoid this for certain `sfactor/dfactor'
    * I do not think that is even worthwhile to check
    * because if someone is using blending they use more
    * interesting settings and also it would add more
    * state tracking to a lot of the code.
    */
   if (ctx->Color.ColorLogicOpEnabled && (ctx->Color.LogicOp != GL_COPY)) {
      return FX_FALLBACK_LOGICOP;
   }

   if ((fxMesa->colDepth != 32) &&
       ((ctx->Color.ColorMask[RCOMP] != ctx->Color.ColorMask[GCOMP]) ||
        (ctx->Color.ColorMask[GCOMP] != ctx->Color.ColorMask[BCOMP]))) {
      return FX_FALLBACK_COLORMASK;
   }

   /* Unsupported texture/multitexture cases */

   /* we can only do 1D/2D textures */
   if (ctx->Texture.Unit[0]._ReallyEnabled & ~(TEXTURE_1D_BIT|TEXTURE_2D_BI