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      1 /*
      2  * Copyright  2011 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 
     24 #include "brw_context.h"
     25 #include "brw_state.h"
     26 #include "brw_defines.h"
     27 #include "intel_batchbuffer.h"
     28 #include "main/fbobject.h"
     29 #include "main/framebuffer.h"
     30 #include "main/viewport.h"
     31 
     32 static void
     33 gen8_upload_sf_clip_viewport(struct brw_context *brw)
     34 {
     35    struct gl_context *ctx = &brw->ctx;
     36    const struct gen_device_info *devinfo = &brw->screen->devinfo;
     37    float y_scale, y_bias;
     38 
     39    /* BRW_NEW_VIEWPORT_COUNT */
     40    const unsigned viewport_count = brw->clip.viewport_count;
     41 
     42    /* _NEW_BUFFERS */
     43    struct gl_framebuffer *fb = ctx->DrawBuffer;
     44    const bool render_to_fbo = _mesa_is_user_fbo(fb);
     45    const uint32_t fb_width = _mesa_geometric_width(ctx->DrawBuffer);
     46    const uint32_t fb_height = _mesa_geometric_height(ctx->DrawBuffer);
     47 
     48    float *vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
     49                                16 * 4 * viewport_count,
     50                                64, &brw->sf.vp_offset);
     51    /* Also assign to clip.vp_offset in case something uses it. */
     52    brw->clip.vp_offset = brw->sf.vp_offset;
     53 
     54    /* _NEW_BUFFERS */
     55    if (render_to_fbo) {
     56       y_scale = 1.0;
     57       y_bias = 0;
     58    } else {
     59       y_scale = -1.0;
     60       y_bias = (float)fb_height;
     61    }
     62 
     63    for (unsigned i = 0; i < viewport_count; i++) {
     64       float scale[3], translate[3];
     65       _mesa_get_viewport_xform(ctx, i, scale, translate);
     66 
     67       /* _NEW_VIEWPORT: Viewport Matrix Elements */
     68       vp[0] = scale[0];                        /* m00 */
     69       vp[1] = scale[1] * y_scale;              /* m11 */
     70       vp[2] = scale[2];                        /* m22 */
     71       vp[3] = translate[0];                    /* m30 */
     72       vp[4] = translate[1] * y_scale + y_bias; /* m31 */
     73       vp[5] = translate[2];                    /* m32 */
     74 
     75       /* Reserved */
     76       vp[6] = 0;
     77       vp[7] = 0;
     78 
     79       brw_calculate_guardband_size(devinfo, fb_width, fb_height,
     80                                    vp[0], vp[1], vp[3], vp[4],
     81                                    &vp[8], &vp[9], &vp[10], &vp[11]);
     82 
     83       /* _NEW_VIEWPORT | _NEW_BUFFERS: Screen Space Viewport
     84        * The hardware will take the intersection of the drawing rectangle,
     85        * scissor rectangle, and the viewport extents. We don't need to be
     86        * smart, and can therefore just program the viewport extents.
     87        */
     88       float viewport_Xmax = ctx->ViewportArray[i].X + ctx->ViewportArray[i].Width;
     89       float viewport_Ymax = ctx->ViewportArray[i].Y + ctx->ViewportArray[i].Height;
     90       if (render_to_fbo) {
     91          vp[12] = ctx->ViewportArray[i].X;
     92          vp[13] = viewport_Xmax - 1;
     93          vp[14] = ctx->ViewportArray[i].Y;
     94          vp[15] = viewport_Ymax - 1;
     95       } else {
     96          vp[12] = ctx->ViewportArray[i].X;
     97          vp[13] = viewport_Xmax - 1;
     98          vp[14] = fb_height - viewport_Ymax;
     99          vp[15] = fb_height - ctx->ViewportArray[i].Y - 1;
    100       }
    101 
    102       vp += 16;
    103    }
    104 
    105    BEGIN_BATCH(2);
    106    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
    107    OUT_BATCH(brw->sf.vp_offset);
    108    ADVANCE_BATCH();
    109 }
    110 
    111 const struct brw_tracked_state gen8_sf_clip_viewport = {
    112    .dirty = {
    113       .mesa = _NEW_BUFFERS |
    114               _NEW_VIEWPORT,
    115       .brw = BRW_NEW_BATCH |
    116              BRW_NEW_BLORP |
    117              BRW_NEW_VIEWPORT_COUNT,
    118    },
    119    .emit = gen8_upload_sf_clip_viewport,
    120 };
    121