swr/swr: Enable ARB_viewport_array

The rasterizer core supported ARB_viewport_array,
but the swr layer connecting core to Gallium state
tracker only allowed one viewport.

We add support for multiple viewports to swr layer.

Reviewed-by: Alok Hota <[email protected]>

8 files changed, 61 insertions, 49 deletions

diff --git a/docs/features.txt b/docs/features.txt
index acb59113ac4..a0952dd4663 100644
--- a/docs/features.txt
+++ b/docs/features.txt
@@ -146,7 +146,7 @@ GL 4.1, GLSL 4.10 --- all DONE: i965/gen7+, nvc0, r600, radeonsi, virgl
   GL_ARB_separate_shader_objects                        DONE (all drivers)
   GL_ARB_shader_precision                               DONE (i965/gen7+, all drivers that support GLSL 4.10)
   GL_ARB_vertex_attrib_64bit                            DONE (i965/gen7+, llvmpipe, softpipe, swr)
-  GL_ARB_viewport_array                                 DONE (i965, nv50, llvmpipe, softpipe)
+  GL_ARB_viewport_array                                 DONE (i965, nv50, llvmpipe, softpipe, swr)
 
 
 GL 4.2, GLSL 4.20 -- all DONE: i965/gen7+, nvc0, r600, radeonsi, virgl
diff --git a/src/gallium/drivers/swr/swr_clear.cpp b/src/gallium/drivers/swr/swr_clear.cpp
index 233432ee34a..3e02bda19c9 100644
--- a/src/gallium/drivers/swr/swr_clear.cpp
+++ b/src/gallium/drivers/swr/swr_clear.cpp
@@ -71,7 +71,7 @@ swr_clear(struct pipe_context *pipe,
    SWR_RECT clear_rect;
    /* If enabled, clear to scissor; otherwise clear full surface */
    if (ctx->rasterizer && ctx->rasterizer->scissor) {
-      clear_rect = ctx->swr_scissor;
+      clear_rect = ctx->swr_scissors[0];
    } else {
       clear_rect = {0, 0, (int32_t)fb->width, (int32_t)fb->height};
    }
diff --git a/src/gallium/drivers/swr/swr_context.cpp b/src/gallium/drivers/swr/swr_context.cpp
index 7aa14d60710..ea3ab6a657d 100644
--- a/src/gallium/drivers/swr/swr_context.cpp
+++ b/src/gallium/drivers/swr/swr_context.cpp
@@ -325,8 +325,8 @@ swr_blit(struct pipe_context *pipe, const struct pipe_blit_info *blit_info)
       ctx->num_so_targets,
       (struct pipe_stream_output_target **)ctx->so_targets);
    util_blitter_save_rasterizer(ctx->blitter, (void *)ctx->rasterizer);
-   util_blitter_save_viewport(ctx->blitter, &ctx->viewport);
-   util_blitter_save_scissor(ctx->blitter, &ctx->scissor);
+   util_blitter_save_viewport(ctx->blitter, &ctx->viewports[0]);
+   util_blitter_save_scissor(ctx->blitter, &ctx->scissors[0]);
    util_blitter_save_fragment_shader(ctx->blitter, ctx->fs);
    util_blitter_save_blend(ctx->blitter, (void *)ctx->blend);
    util_blitter_save_depth_stencil_alpha(ctx->blitter,
@@ -403,6 +403,7 @@ swr_destroy(struct pipe_context *pipe)
 
    swr_destroy_scratch_buffers(ctx);
 
+
    /* Only update screen->pipe if current context is being destroyed */
    assert(screen);
    if (screen->pipe == pipe)
diff --git a/src/gallium/drivers/swr/swr_context.h b/src/gallium/drivers/swr/swr_context.h
index 5c280ee365c..b207c02ca8a 100644
--- a/src/gallium/drivers/swr/swr_context.h
+++ b/src/gallium/drivers/swr/swr_context.h
@@ -132,12 +132,12 @@ struct swr_context {
       constants[PIPE_SHADER_TYPES][PIPE_MAX_CONSTANT_BUFFERS];
    struct pipe_framebuffer_state framebuffer;
    struct swr_poly_stipple poly_stipple;
-   struct pipe_scissor_state scissor;
-   SWR_RECT swr_scissor;
+   struct pipe_scissor_state scissors[KNOB_NUM_VIEWPORTS_SCISSORS];
+   SWR_RECT swr_scissors[KNOB_NUM_VIEWPORTS_SCISSORS];
    struct pipe_sampler_view *
       sampler_views[PIPE_SHADER_TYPES][PIPE_MAX_SHADER_SAMPLER_VIEWS];
 
-   struct pipe_viewport_state viewport;
+   struct pipe_viewport_state viewports[KNOB_NUM_VIEWPORTS_SCISSORS];
    struct pipe_vertex_buffer vertex_buffer[PIPE_MAX_ATTRIBS];
 
    struct blitter_context *blitter;
diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 5789af152fb..464cbf4f3fb 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -218,7 +218,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
       return 1;
    case PIPE_CAP_MAX_VIEWPORTS:
-      return 1;
+      return KNOB_NUM_VIEWPORTS_SCISSORS;
    case PIPE_CAP_ENDIANNESS:
       return PIPE_ENDIAN_NATIVE;
    case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
diff --git a/src/gallium/drivers/swr/swr_shader.cpp b/src/gallium/drivers/swr/swr_shader.cpp
index afa184fc466..6ec492c4102 100644
--- a/src/gallium/drivers/swr/swr_shader.cpp
+++ b/src/gallium/drivers/swr/swr_shader.cpp
@@ -424,6 +424,9 @@ BuilderSWR::swr_gs_llvm_emit_vertex(const struct lp_build_tgsi_gs_iface *gs_base
        } else if (iface->info->output_semantic_name[attrib] == TGSI_SEMANTIC_LAYER) {
           attribSlot = VERTEX_SGV_SLOT;
           sgvChannel = VERTEX_SGV_RTAI_COMP;
+       } else if (iface->info->output_semantic_name[attrib] == TGSI_SEMANTIC_VIEWPORT_INDEX) {
+          attribSlot = VERTEX_SGV_SLOT;
+          sgvChannel = VERTEX_SGV_VAI_COMP;
        } else if (iface->info->output_semantic_name[attrib] == TGSI_SEMANTIC_POSITION) {
           attribSlot = VERTEX_POSITION_SLOT;
        } else {
diff --git a/src/gallium/drivers/swr/swr_state.cpp b/src/gallium/drivers/swr/swr_state.cpp
index e7f1c99b974..42b3fe4d68d 100644
--- a/src/gallium/drivers/swr/swr_state.cpp
+++ b/src/gallium/drivers/swr/swr_state.cpp
@@ -425,9 +425,7 @@ swr_create_gs_state(struct pipe_context *pipe,
       return NULL;
 
    swr_gs->pipe.tokens = tgsi_dup_tokens(gs->tokens);
-
    lp_build_tgsi_info(gs->tokens, &swr_gs->info);
-
    return swr_gs;
 }
 
@@ -615,16 +613,21 @@ swr_set_clip_state(struct pipe_context *pipe,
 static void
 swr_set_scissor_states(struct pipe_context *pipe,
                        unsigned start_slot,
-                       unsigned num_viewports,
-                       const struct pipe_scissor_state *scissor)
+                       unsigned num_scissors,
+                       const struct pipe_scissor_state *scissors)
 {
    struct swr_context *ctx = swr_context(pipe);
 
-   ctx->scissor = *scissor;
-   ctx->swr_scissor.xmin = scissor->minx;
-   ctx->swr_scissor.xmax = scissor->maxx;
-   ctx->swr_scissor.ymin = scissor->miny;
-   ctx->swr_scissor.ymax = scissor->maxy;
+   memcpy(ctx->scissors + start_slot, scissors,
+          sizeof(struct pipe_scissor_state) * num_scissors);
+
+   for (unsigned i = 0; i < num_scissors; i++) {
+      auto idx = start_slot + i;
+      ctx->swr_scissors[idx].xmin = scissors[idx].minx;
+      ctx->swr_scissors[idx].xmax = scissors[idx].maxx;
+      ctx->swr_scissors[idx].ymin = scissors[idx].miny;
+      ctx->swr_scissors[idx].ymax = scissors[idx].maxy;
+   }
    ctx->dirty |= SWR_NEW_SCISSOR;
 }
 
@@ -636,7 +639,7 @@ swr_set_viewport_states(struct pipe_context *pipe,
 {
    struct swr_context *ctx = swr_context(pipe);
 
-   ctx->viewport = *vpt;
+   memcpy(ctx->viewports + start_slot, vpt, sizeof(struct pipe_viewport_state) * num_viewports);
    ctx->dirty |= SWR_NEW_VIEWPORT;
 }
 
@@ -1202,41 +1205,46 @@ swr_update_derived(struct pipe_context *pipe,
    /* Viewport */
    if (ctx->dirty & (SWR_NEW_VIEWPORT | SWR_NEW_FRAMEBUFFER
                      | SWR_NEW_RASTERIZER)) {
-      pipe_viewport_state *state = &ctx->viewport;
+      pipe_viewport_state *state = &ctx->viewports[0];
       pipe_framebuffer_state *fb = &ctx->framebuffer;
       pipe_rasterizer_state *rasterizer = ctx->rasterizer;
 
-      SWR_VIEWPORT *vp = &ctx->derived.vp;
+      SWR_VIEWPORT *vp = &ctx->derived.vp[0];
       SWR_VIEWPORT_MATRICES *vpm = &ctx->derived.vpm;
 
-      vp->x = state->translate[0] - state->scale[0];
-      vp->width = 2 * state->scale[0];
-      vp->y = state->translate[1] - fabs(state->scale[1]);
-      vp->height = 2 * fabs(state->scale[1]);
-      util_viewport_zmin_zmax(state, rasterizer->clip_halfz,
-                              &vp->minZ, &vp->maxZ);
-
-      vpm->m00[0] = state->scale[0];
-      vpm->m11[0] = state->scale[1];
-      vpm->m22[0] = state->scale[2];
-      vpm->m30[0] = state->translate[0];
-      vpm->m31[0] = state->translate[1];
-      vpm->m32[0] = state->translate[2];
-
-      /* Now that the matrix is calculated, clip the view coords to screen
-       * size.  OpenGL allows for -ve x,y in the viewport. */
-      if (vp->x < 0.0f) {
-         vp->width += vp->x;
-         vp->x = 0.0f;
-      }
-      if (vp->y < 0.0f) {
-         vp->height += vp->y;
-         vp->y = 0.0f;
-      }
-      vp->width = std::min(vp->width, (float)fb->width - vp->x);
-      vp->height = std::min(vp->height, (float)fb->height - vp->y);
+      for (unsigned i = 0; i < KNOB_NUM_VIEWPORTS_SCISSORS; i++) {
+         vp->x = state->translate[0] - state->scale[0];
+         vp->width = 2 * state->scale[0];
+         vp->y = state->translate[1] - fabs(state->scale[1]);
+         vp->height = 2 * fabs(state->scale[1]);
+         util_viewport_zmin_zmax(state, rasterizer->clip_halfz,
+                                 &vp->minZ, &vp->maxZ);
+
+         vpm->m00[i] = state->scale[0];
+         vpm->m11[i] = state->scale[1];
+         vpm->m22[i] = state->scale[2];
+         vpm->m30[i] = state->translate[0];
+         vpm->m31[i] = state->translate[1];
+         vpm->m32[i] = state->translate[2];
+
+         /* Now that the matrix is calculated, clip the view coords to screen
+          * size.  OpenGL allows for -ve x,y in the viewport. */
+         if (vp->x < 0.0f) {
+            vp->width += vp->x;
+            vp->x = 0.0f;
+         }
+         if (vp->y < 0.0f) {
+            vp->height += vp->y;
+            vp->y = 0.0f;
+         }
+         vp->width = std::min(vp->width, (float) fb->width - vp->x);
+         vp->height = std::min(vp->height, (float) fb->height - vp->y);
 
-      ctx->api.pfnSwrSetViewports(ctx->swrContext, 1, vp, vpm);
+         vp++;
+         state++;
+      }
+      ctx->api.pfnSwrSetViewports(ctx->swrContext, KNOB_NUM_VIEWPORTS_SCISSORS,
+                                  &ctx->derived.vp[0], &ctx->derived.vpm);
    }
 
    /* When called from swr_clear (p_draw_info = null), render targets,
@@ -1253,7 +1261,7 @@ swr_update_derived(struct pipe_context *pipe,
 
    /* Scissor */
    if (ctx->dirty & SWR_NEW_SCISSOR) {
-      ctx->api.pfnSwrSetScissorRects(ctx->swrContext, 1, &ctx->swr_scissor);
+      ctx->api.pfnSwrSetScissorRects(ctx->swrContext, KNOB_NUM_VIEWPORTS_SCISSORS, ctx->swr_scissors);
    }
 
    /* Set vertex & index buffers */
diff --git a/src/gallium/drivers/swr/swr_state.h b/src/gallium/drivers/swr/swr_state.h
index 7940a960d93..45d0925e8e7 100644
--- a/src/gallium/drivers/swr/swr_state.h
+++ b/src/gallium/drivers/swr/swr_state.h
@@ -103,7 +103,7 @@ struct swr_poly_stipple {
  */
 struct swr_derived_state {
    SWR_RASTSTATE rastState;
-   SWR_VIEWPORT vp;
+   SWR_VIEWPORT vp[KNOB_NUM_VIEWPORTS_SCISSORS];
    SWR_VIEWPORT_MATRICES vpm;
 };