#include "gen6_hiz.h"
+#include <assert.h>
+
+#include "mesa/drivers/common/meta.h"
+
+#include "mesa/main/arrayobj.h"
+#include "mesa/main/bufferobj.h"
+#include "mesa/main/depth.h"
+#include "mesa/main/enable.h"
+#include "mesa/main/fbobject.h"
+#include "mesa/main/framebuffer.h"
+#include "mesa/main/get.h"
+#include "mesa/main/renderbuffer.h"
+#include "mesa/main/shaderapi.h"
+#include "mesa/main/varray.h"
+
+#include "intel_fbo.h"
+#include "intel_mipmap_tree.h"
+#include "intel_regions.h"
+#include "intel_tex.h"
+
+#include "brw_context.h"
+#include "brw_defines.h"
+
+static const uint32_t gen6_hiz_meta_save =
+
+ /* Disable alpha, depth, and stencil test.
+ *
+ * See the following sections of the Sandy Bridge PRM, Volume 1, Part2:
+ * - 7.5.3.1 Depth Buffer Clear
+ * - 7.5.3.2 Depth Buffer Resolve
+ * - 7.5.3.3 Hierarchical Depth Buffer Resolve
+ */
+ MESA_META_ALPHA_TEST |
+ MESA_META_DEPTH_TEST |
+ MESA_META_STENCIL_TEST |
+
+ /* Disable viewport mapping.
+ *
+ * From page 11 of the Sandy Bridge PRM, Volume 2, Part 1, Section 1.3
+ * 3D Primitives Overview:
+ * RECTLIST:
+ * Viewport Mapping must be DISABLED (as is typical with the use of
+ * screen- space coordinates).
+ *
+ * We must also manually disable 3DSTATE_SF.Viewport_Transform_Enable.
+ */
+ MESA_META_VIEWPORT |
+
+ /* Disable clipping.
+ *
+ * From page 11 of the Sandy Bridge PRM, Volume 2, Part 1, Section 1.3
+ * 3D Primitives Overview:
+ * Either the CLIP unit should be DISABLED, or the CLIP unit’s Clip
+ * Mode should be set to a value other than CLIPMODE_NORMAL.
+ */
+ MESA_META_CLIP |
+
+ /* Render a solid rectangle (set 3DSTATE_SF.FrontFace_Fill_Mode).
+ *
+ * From page 249 of the Sandy Bridge PRM, Volume 2, Part 1, Section
+ * 6.4.1.1 3DSTATE_SF, FrontFace_Fill_Mode:
+ * SOLID: Any triangle or rectangle object found to be front-facing
+ * is rendered as a solid object. This setting is required when
+ * (rendering rectangle (RECTLIST) objects.
+ * Also see field BackFace_Fill_Mode.
+ *
+ * Note: MESA_META_RASTERIZAION also disables culling, but that is
+ * irrelevant. See 3DSTATE_SF.Cull_Mode.
+ */
+ MESA_META_RASTERIZATION |
+
+ /* Each HiZ operation uses a vertex shader and VAO. */
+ MESA_META_SHADER |
+ MESA_META_VERTEX |
+
+ /* Disable scissoring.
+ *
+ * Scissoring is disabled for resolves because a resolve operation
+ * should resolve the entire buffer. Scissoring is disabled for depth
+ * clears because, if we are performing a partial depth clear, then we
+ * specify the clear region with the RECTLIST vertices.
+ */
+ MESA_META_SCISSOR |
+
+ MESA_META_SELECT_FEEDBACK;
+
+/**
+ * Initialize static data needed for HiZ operations.
+ */
+static void
+gen6_hiz_init(struct brw_context *brw)
+{
+ struct gl_context *ctx = &brw->intel.ctx;
+ struct brw_hiz_state *hiz = &brw->hiz;
+
+ if (hiz->fbo != 0)
+ return;
+
+ /* Create depthbuffer.
+ *
+ * Until glRenderbufferStorage is called, the renderbuffer hash table
+ * maps the renderbuffer name to a dummy renderbuffer. We need the
+ * renderbuffer to be registered in the hash table so that framebuffer
+ * validation succeeds, so we hackishly allocate storage then immediately
+ * discard it.
+ */
+ GLuint depth_rb_name;
+ _mesa_GenRenderbuffersEXT(1, &depth_rb_name);
+ _mesa_BindRenderbufferEXT(GL_RENDERBUFFER, depth_rb_name);
+ _mesa_RenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, 32, 32);
+ _mesa_reference_renderbuffer(&hiz->depth_rb,
+ _mesa_lookup_renderbuffer(ctx, depth_rb_name));
+ intel_miptree_release(&((struct intel_renderbuffer*) hiz->depth_rb)->mt);
+
+ /* Setup FBO. */
+ _mesa_GenFramebuffersEXT(1, &hiz->fbo);
+ _mesa_BindFramebufferEXT(GL_DRAW_FRAMEBUFFER, hiz->fbo);
+ _mesa_FramebufferRenderbufferEXT(GL_DRAW_FRAMEBUFFER,
+ GL_DEPTH_ATTACHMENT,
+ GL_RENDERBUFFER,
+ hiz->depth_rb->Name);
+
+ /* Compile vertex shader. */
+ const char *vs_source =
+ "attribute vec4 position;\n"
+ "void main()\n"
+ "{\n"
+ " gl_Position = position;\n"
+ "}\n";
+ GLuint vs = _mesa_CreateShaderObjectARB(GL_VERTEX_SHADER);
+ _mesa_ShaderSourceARB(vs, 1, &vs_source, NULL);
+ _mesa_CompileShaderARB(vs);
+
+ /* Compile fragment shader. */
+ const char *fs_source = "void main() {}";
+ GLuint fs = _mesa_CreateShaderObjectARB(GL_FRAGMENT_SHADER);
+ _mesa_ShaderSourceARB(fs, 1, &fs_source, NULL);
+ _mesa_CompileShaderARB(fs);
+
+ /* Link and use program. */
+ hiz->shader.program = _mesa_CreateProgramObjectARB();
+ _mesa_AttachShader(hiz->shader.program, vs);
+ _mesa_AttachShader(hiz->shader.program, fs);
+ _mesa_LinkProgramARB(hiz->shader.program);
+ _mesa_UseProgramObjectARB(hiz->shader.program);
+
+ /* Create and bind VAO. */
+ _mesa_GenVertexArrays(1, &hiz->vao);
+ _mesa_BindVertexArray(hiz->vao);
+
+ /* Setup VBO for 'position'. */
+ hiz->shader.position_location =
+ _mesa_GetAttribLocationARB(hiz->shader.program, "position");
+ _mesa_GenBuffersARB(1, &hiz->shader.position_vbo);
+ _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, hiz->shader.position_vbo);
+ _mesa_VertexAttribPointerARB(hiz->shader.position_location,
+ 2, /*components*/
+ GL_FLOAT,
+ GL_FALSE, /*normalized?*/
+ 0, /*stride*/
+ NULL);
+ _mesa_EnableVertexAttribArrayARB(hiz->shader.position_location);
+
+ /* Cleanup. */
+ _mesa_DeleteShader(vs);
+ _mesa_DeleteShader(fs);
+}
+
+/**
+ * Wrap \c brw->hiz.depth_rb around a miptree.
+ *
+ * \see gen6_hiz_teardown_depth_buffer()
+ */
+static void
+gen6_hiz_setup_depth_buffer(struct brw_context *brw,
+ struct intel_mipmap_tree *mt,
+ unsigned int level,
+ unsigned int layer)
+{
+ struct gl_renderbuffer *rb = brw->hiz.depth_rb;
+ struct intel_renderbuffer *irb = intel_renderbuffer(rb);
+
+ rb->Format = mt->format;
+ rb->_BaseFormat = _mesa_get_format_base_format(rb->Format);
+ rb->DataType = intel_mesa_format_to_rb_datatype(rb->Format);
+ rb->InternalFormat = rb->_BaseFormat;
+ rb->Width = mt->level[level].width;
+ rb->Height = mt->level[level].height;
+
+ irb->mt_level = level;
+ irb->mt_layer = layer;
+
+ intel_miptree_reference(&irb->mt, mt);
+ intel_renderbuffer_set_draw_offset(irb);
+}
+
+/**
+ * Release the region from \c brw->hiz.depth_rb.
+ *
+ * \see gen6_hiz_setup_depth_buffer()
+ */
+static void
+gen6_hiz_teardown_depth_buffer(struct gl_renderbuffer *rb)
+{
+ struct intel_renderbuffer *irb = intel_renderbuffer(rb);
+ intel_miptree_release(&irb->mt);
+}
+
+static void
+gen6_resolve_slice(struct intel_context *intel,
+ struct intel_mipmap_tree *mt,
+ unsigned int level,
+ unsigned int layer,
+ enum brw_hiz_op op)
+{
+ struct gl_context *ctx = &intel->ctx;
+ struct brw_context *brw = brw_context(ctx);
+ struct brw_hiz_state *hiz = &brw->hiz;
+
+ /* Do not recurse. */
+ assert(!brw->hiz.op);
+
+ assert(mt->hiz_mt != NULL);
+ assert(level >= mt->first_level);
+ assert(level <= mt->last_level);
+ assert(layer < mt->level[level].depth);
+
+ /* Save state. */
+ GLint save_drawbuffer;
+ GLint save_renderbuffer;
+ _mesa_meta_begin(ctx, gen6_hiz_meta_save);
+ _mesa_GetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &save_drawbuffer);
+ _mesa_GetIntegerv(GL_RENDERBUFFER_BINDING, &save_renderbuffer);
+
+ /* Initialize context data for HiZ operations. */
+ gen6_hiz_init(brw);
+
+ /* Set depth state. */
+ if (!ctx->Depth.Mask) {
+ /* This sets 3DSTATE_WM.Depth_Buffer_Write_Enable. */
+ _mesa_DepthMask(GL_TRUE);
+ }
+ if (op == BRW_HIZ_OP_DEPTH_RESOLVE) {
+ _mesa_set_enable(ctx, GL_DEPTH_TEST, GL_TRUE);
+ _mesa_DepthFunc(GL_NEVER);
+ }
+
+ /* Setup FBO. */
+ gen6_hiz_setup_depth_buffer(brw, mt, level, layer);
+ _mesa_BindFramebufferEXT(GL_DRAW_FRAMEBUFFER, hiz->fbo);
+
+
+ /* A rectangle primitive (3DPRIM_RECTLIST) consists of only three vertices.
+ * The vertices reside in screen space with DirectX coordinates (this is,
+ * (0, 0) is the upper left corner).
+ *
+ * v2 ------ implied
+ * | |
+ * | |
+ * v0 ----- v1
+ */
+ const int width = hiz->depth_rb->Width;
+ const int height = hiz->depth_rb->Height;
+ const GLfloat positions[] = {
+ 0, height,
+ width, height,
+ 0, 0,
+ };
+
+ /* Setup program and vertex attributes. */
+ _mesa_UseProgramObjectARB(hiz->shader.program);
+ _mesa_BindVertexArray(hiz->vao);
+ _mesa_BindBufferARB(GL_ARRAY_BUFFER, hiz->shader.position_vbo);
+ _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(positions), positions,
+ GL_DYNAMIC_DRAW_ARB);
+
+ /* Execute the HiZ operation. */
+ brw->hiz.op = op;
+ _mesa_DrawArrays(GL_TRIANGLES, 0, 3);
+ brw->hiz.op = BRW_HIZ_OP_NONE;
+
+ /* Restore state.
+ *
+ * The order in which state is restored is significant. The draw buffer
+ * used for the HiZ op has no stencil buffer, and glStencilFunc() clamps
+ * the stencil reference value to the range allowed by the draw buffer's
+ * number of stencil bits. So, the draw buffer binding must be restored
+ * before the stencil state, or else the stencil ref will be clamped to 0.
+ */
+ gen6_hiz_teardown_depth_buffer(hiz->depth_rb);
+ _mesa_BindRenderbufferEXT(GL_RENDERBUFFER, save_renderbuffer);
+ _mesa_BindFramebufferEXT(GL_DRAW_FRAMEBUFFER, save_drawbuffer);
+ _mesa_meta_end(ctx);
+}
+
void
gen6_resolve_hiz_slice(struct intel_context *intel,
struct intel_mipmap_tree *mt,
uint32_t level,
uint32_t layer)
{
- /* FINISHME: stub */
+ gen6_resolve_slice(intel, mt, level, layer, BRW_HIZ_OP_HIZ_RESOLVE);
}
+
void
gen6_resolve_depth_slice(struct intel_context *intel,
struct intel_mipmap_tree *mt,
uint32_t level,
uint32_t layer)
{
- /* FINISHME: stub */
+ gen6_resolve_slice(intel, mt, level, layer, BRW_HIZ_OP_DEPTH_RESOLVE);
}
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