v3dv: make v3dv_viewport_compute_xform depend on the V3D version

For 4.x we have a workaround for too small Z scale values that is not
required for V3D 7.x.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25450>

src/broadcom/vulkan/v3dv_cmd_buffer.c

@@ -2132,39 +2132,6 @@ v3dv_CmdBindPipeline(VkCommandBuffer commandBuffer,
    }
 }
 
-/* FIXME: C&P from radv. tu has similar code. Perhaps common place? */
-void
-v3dv_viewport_compute_xform(const VkViewport *viewport,
-                            float scale[3],
-                            float translate[3])
-{
-   float x = viewport->x;
-   float y = viewport->y;
-   float half_width = 0.5f * viewport->width;
-   float half_height = 0.5f * viewport->height;
-   double n = viewport->minDepth;
-   double f = viewport->maxDepth;
-
-   scale[0] = half_width;
-   translate[0] = half_width + x;
-   scale[1] = half_height;
-   translate[1] = half_height + y;
-
-   scale[2] = (f - n);
-   translate[2] = n;
-
-   /* It seems that if the scale is small enough the hardware won't clip
-    * correctly so we work around this my choosing the smallest scale that
-    * seems to work.
-    *
-    * This case is exercised by CTS:
-    * dEQP-VK.draw.inverted_depth_ranges.nodepthclamp_deltazero
-    */
-   const float min_abs_scale = 0.000009f;
-   if (fabs(scale[2]) < min_abs_scale)
-      scale[2] = scale[2] < 0 ? -min_abs_scale : min_abs_scale;
-}
-
 /* Considers the pipeline's negative_one_to_one state and applies it to the
  * current viewport transform if needed to produce the resulting Z translate
  * and scale parameters.
@@ -2217,9 +2184,10 @@ v3dv_CmdSetViewport(VkCommandBuffer commandBuffer,
           viewportCount * sizeof(*pViewports));
 
    for (uint32_t i = firstViewport; i < total_count; i++) {
-      v3dv_viewport_compute_xform(&state->dynamic.viewport.viewports[i],
-                                  state->dynamic.viewport.scale[i],
-                                  state->dynamic.viewport.translate[i]);
+      v3dv_X(cmd_buffer->device, viewport_compute_xform)
+         (&state->dynamic.viewport.viewports[i],
+          state->dynamic.viewport.scale[i],
+          state->dynamic.viewport.translate[i]);
    }
 
    cmd_buffer->state.dirty |= V3DV_CMD_DIRTY_VIEWPORT;

src/broadcom/vulkan/v3dv_pipeline.c

@@ -2686,9 +2686,10 @@ pipeline_init_dynamic_state(
                       pViewportState->viewportCount);
 
          for (uint32_t i = 0; i < dynamic->viewport.count; i++) {
-            v3dv_viewport_compute_xform(&dynamic->viewport.viewports[i],
-                                        dynamic->viewport.scale[i],
-                                        dynamic->viewport.translate[i]);
+            v3dv_X(pipeline->device, viewport_compute_xform)
+               (&dynamic->viewport.viewports[i],
+                dynamic->viewport.scale[i],
+                dynamic->viewport.translate[i]);
          }
       }
 

src/broadcom/vulkan/v3dvx_cmd_buffer.c

@@ -1285,6 +1285,43 @@ v3dX(cmd_buffer_emit_render_pass_rcl)(struct v3dv_cmd_buffer *cmd_buffer)
    cl_emit(rcl, END_OF_RENDERING, end);
 }
 
+void
+v3dX(viewport_compute_xform)(const VkViewport *viewport,
+                            float scale[3],
+                            float translate[3])
+{
+   float x = viewport->x;
+   float y = viewport->y;
+   float half_width = 0.5f * viewport->width;
+   float half_height = 0.5f * viewport->height;
+   double n = viewport->minDepth;
+   double f = viewport->maxDepth;
+
+   scale[0] = half_width;
+   translate[0] = half_width + x;
+   scale[1] = half_height;
+   translate[1] = half_height + y;
+
+   scale[2] = (f - n);
+   translate[2] = n;
+
+   /* It seems that if the scale is small enough the hardware won't clip
+    * correctly so we work around this my choosing the smallest scale that
+    * seems to work.
+    *
+    * This case is exercised by CTS:
+    * dEQP-VK.draw.renderpass.inverted_depth_ranges.nodepthclamp_deltazero
+    *
+    * V3D 7.x fixes this by using the new
+    * CLIPPER_Z_SCALE_AND_OFFSET_NO_GUARDBAND.
+    */
+#if V3D_VERSION <= 42
+   const float min_abs_scale = 0.0005f;
+   if (fabs(scale[2]) < min_abs_scale)
+      scale[2] = scale[2] < 0 ? -min_abs_scale : min_abs_scale;
+#endif
+}
+
 void
 v3dX(cmd_buffer_emit_viewport)(struct v3dv_cmd_buffer *cmd_buffer)
 {

src/broadcom/vulkan/v3dvx_private.h

@@ -339,3 +339,8 @@ v3dX(clamp_for_format_and_type)(uint32_t rt_type,
 uint32_t
 v3dX(clamp_for_format_and_type)(uint32_t rt_type,
                                 VkFormat vk_format);
+
+void
+v3dX(viewport_compute_xform)(const VkViewport *viewport,
+                             float scale[3],
+                             float translate[3]);