src/mesa/pipe/i915simple/i915_state_derived.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "main/macros.h"
  30 #include "main/enums.h"
  31
  32 #include "vf/vf.h"
  33 #include "pipe/draw/draw_context.h"
  34 #include "i915_context.h"
  35 #include "i915_state.h"
  36
  37
  38 #define EMIT_ATTR( VF_ATTR, FRAG_ATTR, INTERP )                 \
  39 do {                                                            \
  40    slot_to_vf_attr[nr_attrs] = VF_ATTR;         \
  41    nr_attrs++;                                  \
  42    attr_mask |= (1 << (VF_ATTR));                               \
  43 } while (0)
  44
  45
  46 static const GLuint frag_to_vf[FRAG_ATTRIB_MAX] =
  47 {
  48    VF_ATTRIB_POS,
  49    VF_ATTRIB_COLOR0,
  50    VF_ATTRIB_COLOR1,
  51    VF_ATTRIB_FOG,
  52    VF_ATTRIB_TEX0,
  53    VF_ATTRIB_TEX1,
  54    VF_ATTRIB_TEX2,
  55    VF_ATTRIB_TEX3,
  56    VF_ATTRIB_TEX4,
  57    VF_ATTRIB_TEX5,
  58    VF_ATTRIB_TEX6,
  59    VF_ATTRIB_TEX7,
  60    VF_ATTRIB_VAR0,
  61    VF_ATTRIB_VAR1,
  62    VF_ATTRIB_VAR2,
  63    VF_ATTRIB_VAR3,
  64    VF_ATTRIB_VAR4,
  65    VF_ATTRIB_VAR5,
  66    VF_ATTRIB_VAR6,
  67    VF_ATTRIB_VAR7,
  68 };
  69
  70
  71 /**
  72  * Determine which post-transform / pre-rasterization vertex attributes
  73  * we need.
  74  * Derived from:  fs, setup states.
  75  */
  76 static void calculate_vertex_layout( struct i915_context *i915 )
  77 {
  78 //   const GLbitfield inputsRead = i915->fs.inputs_read;
  79    const GLbitfield inputsRead = (FRAG_BIT_WPOS | FRAG_BIT_COL0);
  80    GLuint slot_to_vf_attr[VF_ATTRIB_MAX];
  81    GLbitfield attr_mask = 0x0;
  82    GLuint nr_attrs = 0;
  83    GLuint i;
  84
  85    memset(slot_to_vf_attr, 0, sizeof(slot_to_vf_attr));
  86
  87
  88    /* TODO - Figure out if we need to do perspective divide, etc.
  89     */
  90    EMIT_ATTR(VF_ATTRIB_POS, FRAG_ATTRIB_WPOS, INTERP_LINEAR);
  91
  92    /* Pull in the rest of the attributes.  They are all in float4
  93     * format.  Future optimizations could be to keep some attributes
  94     * as fixed point or ubyte format.
  95     */
  96    for (i = 1; i < FRAG_ATTRIB_TEX0; i++) {
  97       if (inputsRead & (1 << i)) {
  98          assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
  99          if (i915->setup.flatshade
 100              && (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1))
 101             EMIT_ATTR(frag_to_vf[i], i, INTERP_CONSTANT);
 102          else
 103             EMIT_ATTR(frag_to_vf[i], i, INTERP_LINEAR);
 104       }
 105    }
 106
 107    for (i = FRAG_ATTRIB_TEX0; i < FRAG_ATTRIB_MAX; i++) {
 108       if (inputsRead & (1 << i)) {
 109          assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
 110          EMIT_ATTR(frag_to_vf[i], i, INTERP_PERSPECTIVE);
 111       }
 112    }
 113
 114    /* Additional attributes required for setup: Just twosided
 115     * lighting.  Edgeflag is dealt with specially by setting bits in
 116     * the vertex header.
 117     */
 118    if (i915->setup.light_twoside) {
 119       if (inputsRead & FRAG_BIT_COL0) {
 120          EMIT_ATTR(VF_ATTRIB_BFC0, FRAG_ATTRIB_MAX, 0); /* XXX: mark as discarded after setup */
 121       }
 122
 123       if (inputsRead & FRAG_BIT_COL1) {
 124          EMIT_ATTR(VF_ATTRIB_BFC1, FRAG_ATTRIB_MAX, 0); /* XXX: discard after setup */
 125       }
 126    }
 127
 128    /* If the attributes have changed, tell the draw module (which in turn
 129     * tells the vf module) about the new vertex layout.
 130     */
 131    draw_set_vertex_attributes( i915->draw,
 132                                slot_to_vf_attr,
 133                                nr_attrs );
 134 }
 135
 136
 137 /**
 138  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 139  */
 140 static void
 141 compute_cliprect(struct i915_context *sp)
 142 {
 143    GLint surfWidth, surfHeight;
 144
 145    if (sp->framebuffer.num_cbufs > 0) {
 146       surfWidth = sp->framebuffer.cbufs[0]->width;
 147       surfHeight = sp->framebuffer.cbufs[0]->height;
 148    }
 149    else {
 150       /* no surface? */
 151       surfWidth = sp->scissor.maxx;
 152       surfHeight = sp->scissor.maxy;
 153    }
 154
 155    if (sp->setup.scissor) {
 156       /* clip to scissor rect */
 157       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 158       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 159       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 160       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 161    }
 162    else {
 163       /* clip to surface bounds */
 164       sp->cliprect.minx = 0;
 165       sp->cliprect.miny = 0;
 166       sp->cliprect.maxx = surfWidth;
 167       sp->cliprect.maxy = surfHeight;
 168    }
 169 }
 170
 171
 172 /* Hopefully this will remain quite simple, otherwise need to pull in
 173  * something like the state tracker mechanism.
 174  */
 175 void i915_update_derived( struct i915_context *i915 )
 176 {
 177    if (i915->dirty & (I915_NEW_SETUP | I915_NEW_FS))
 178       calculate_vertex_layout( i915 );
 179
 180    if (i915->dirty & (I915_NEW_SCISSOR |
 181                       I915_NEW_STENCIL |
 182                       I915_NEW_FRAMEBUFFER))
 183       compute_cliprect(i915);
 184
 185    i915->dirty = 0;
 186 }