panfrost: Initial stub for Panfrost driver

This patch adds an initial stub for the Gallium driver, containing
simple screen functions and the majority of the driver headers but no
actual functionality. It further adds the winsys glue for linking in
this stub driver via kmsro on Rockchip/Amlogic boards.

Signed-off-by: Alyssa Rosenzweig <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>
Acked-by: Rob Clark <[email protected]>
Acked-by: Eric Anholt <[email protected]>
Acked-by: Emil Velikov <[email protected]>

1 files changed, 702 insertions, 0 deletions

diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
new file mode 100644
index 00000000000..0e745583940
--- /dev/null
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -0,0 +1,702 @@
+/**************************************************************************
+ *
+ * Copyright 2008 VMware, Inc.
+ * Copyright 2014 Broadcom
+ * Copyright 2018 Alyssa Rosenzweig
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "util/u_memory.h"
+#include "util/u_format.h"
+#include "util/u_format_s3tc.h"
+#include "util/u_video.h"
+#include "util/os_time.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_screen.h"
+#include "draw/draw_context.h"
+#include <xf86drm.h>
+
+#include <fcntl.h>
+
+#include "drm_fourcc.h"
+
+#include "pan_screen.h"
+#include "pan_resource.h"
+#include "pan_public.h"
+
+#include "pan_context.h"
+
+static const char *
+panfrost_get_name(struct pipe_screen *screen)
+{
+        return "panfrost";
+}
+
+static const char *
+panfrost_get_vendor(struct pipe_screen *screen)
+{
+        return "panfrost";
+}
+
+static const char *
+panfrost_get_device_vendor(struct pipe_screen *screen)
+{
+        return "Arm";
+}
+
+static int
+panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
+{
+        switch (param) {
+        case PIPE_CAP_NPOT_TEXTURES:
+        case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+        case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
+                return 1;
+
+        case PIPE_CAP_SM3:
+                return 1;
+
+        case PIPE_CAP_POINT_SPRITE:
+                return 1;
+
+        case PIPE_CAP_MAX_RENDER_TARGETS:
+                return PIPE_MAX_COLOR_BUFS;
+
+        case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
+                return 1;
+
+        case PIPE_CAP_OCCLUSION_QUERY:
+        case PIPE_CAP_QUERY_TIME_ELAPSED:
+        case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
+                return 1; /* TODO: Queries */
+
+        case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
+                return 1;
+
+        case PIPE_CAP_TEXTURE_SWIZZLE:
+                return 1;
+
+        case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
+                return 0;
+
+        case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
+                return 13;
+
+        case PIPE_CAP_BLEND_EQUATION_SEPARATE:
+                return 1;
+
+        case PIPE_CAP_INDEP_BLEND_ENABLE:
+                return 1;
+
+        case PIPE_CAP_INDEP_BLEND_FUNC:
+                return 1;
+
+        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+                return 1;
+
+        case PIPE_CAP_DEPTH_CLIP_DISABLE:
+                return 1;
+
+        case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
+                return 0; /* no streamout */
+
+        case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
+        case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
+                return 16 * 4;
+
+        case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
+        case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
+                return 1024;
+
+        case PIPE_CAP_MAX_VERTEX_STREAMS:
+                return 1;
+
+        case PIPE_CAP_PRIMITIVE_RESTART:
+                return 0; /* We don't understand this yet */
+
+        case PIPE_CAP_SHADER_STENCIL_EXPORT:
+                return 1;
+
+        case PIPE_CAP_TGSI_INSTANCEID:
+        case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
+        case PIPE_CAP_START_INSTANCE:
+                return 0; /* TODO: Instances */
+
+        case PIPE_CAP_SEAMLESS_CUBE_MAP:
+        case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
+                return 1;
+
+        case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
+                return 256; /* for GL3 */
+
+        case PIPE_CAP_MIN_TEXEL_OFFSET:
+                return -8;
+
+        case PIPE_CAP_MAX_TEXEL_OFFSET:
+                return 7;
+
+        case PIPE_CAP_CONDITIONAL_RENDER:
+                return 1;
+
+        case PIPE_CAP_TEXTURE_BARRIER:
+                return 0;
+
+        case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
+        case PIPE_CAP_VERTEX_COLOR_UNCLAMPED: /* draw module */
+        case PIPE_CAP_VERTEX_COLOR_CLAMPED: /* draw module */
+                return 1;
+
+        case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
+                return 0;
+
+        case PIPE_CAP_GLSL_FEATURE_LEVEL:
+                return 330;
+
+        case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
+        case PIPE_CAP_TGSI_TEX_TXF_LZ:
+                return 0;
+
+        case PIPE_CAP_COMPUTE:
+                return 0;
+
+        case PIPE_CAP_USER_VERTEX_BUFFERS: /* XXX XXX */
+        case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
+                return 0;
+
+        case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
+        case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
+        case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
+        case PIPE_CAP_DOUBLES:
+        case PIPE_CAP_INT64:
+        case PIPE_CAP_INT64_DIVMOD:
+                return 1;
+
+        case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+                return 16;
+
+        case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
+        case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
+        case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
+        case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
+        case PIPE_CAP_TEXTURE_MULTISAMPLE:
+                return 0;
+
+        case PIPE_CAP_MAX_VERTEX_ELEMENT_SRC_OFFSET:
+                return 0xffff;
+
+        case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
+                return 64;
+
+        case PIPE_CAP_QUERY_TIMESTAMP:
+        case PIPE_CAP_CUBE_MAP_ARRAY:
+                return 1;
+
+        case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
+                return 1;
+
+        case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
+                return 0;
+
+        case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+                return 65536;
+
+        case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
+                return 0;
+
+        case PIPE_CAP_TGSI_TEXCOORD:
+                return 1; /* XXX: What should this me exactly? */
+
+        case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
+                return 0;
+
+        case PIPE_CAP_MAX_VIEWPORTS:
+                return PIPE_MAX_VIEWPORTS;
+
+        case PIPE_CAP_ENDIANNESS:
+                return PIPE_ENDIAN_NATIVE;
+
+        case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
+                return 4;
+
+        case PIPE_CAP_TEXTURE_GATHER_SM5:
+        case PIPE_CAP_TEXTURE_QUERY_LOD:
+                return 1;
+
+        case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
+        case PIPE_CAP_SAMPLE_SHADING:
+        case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+                return 0;
+
+        case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
+                return 1;
+
+        case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
+                return 0;
+
+        case PIPE_CAP_SAMPLER_VIEW_TARGET:
+                return 1;
+
+        case PIPE_CAP_FAKE_SW_MSAA:
+                return 1;
+
+        case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
+                return -32;
+
+        case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
+                return 31;
+
+        case PIPE_CAP_DRAW_INDIRECT:
+                return 1;
+
+        case PIPE_CAP_QUERY_SO_OVERFLOW:
+                return 1;
+
+        case PIPE_CAP_VENDOR_ID:
+                return 0xFFFFFFFF;
+
+        case PIPE_CAP_DEVICE_ID:
+                return 0xFFFFFFFF;
+
+        case PIPE_CAP_ACCELERATED:
+                return 1;
+
+        case PIPE_CAP_VIDEO_MEMORY: {
+                /* XXX: Do we want to return the full amount fo system memory ? */
+                uint64_t system_memory;
+
+                if (!os_get_total_physical_memory(&system_memory))
+                        return 0;
+
+                if (sizeof(void *) == 4)
+                        /* Cap to 2 GB on 32 bits system. We do this because panfrost does
+                         * eat application memory, which is quite limited on 32 bits. App
+                         * shouldn't expect too much available memory. */
+                        system_memory = MIN2(system_memory, 2048 << 20);
+
+                return (int)(system_memory >> 20);
+        }
+
+        case PIPE_CAP_UMA:
+                return 0;
+
+        case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
+                return 1;
+
+        case PIPE_CAP_CLIP_HALFZ:
+        case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
+        case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
+                return 1;
+
+        case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
+        case PIPE_CAP_CULL_DISTANCE:
+                return 1;
+
+        case PIPE_CAP_VERTEXID_NOBASE:
+                return 0;
+
+        case PIPE_CAP_POLYGON_OFFSET_CLAMP:
+                return 0;
+
+        case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
+        case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
+                return 1;
+
+        case PIPE_CAP_CLEAR_TEXTURE:
+                return 1;
+
+        case PIPE_CAP_ANISOTROPIC_FILTER:
+        case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
+        case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
+        case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
+        case PIPE_CAP_DEPTH_BOUNDS_TEST:
+        case PIPE_CAP_TGSI_TXQS:
+        case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
+        case PIPE_CAP_SHAREABLE_SHADERS:
+        case PIPE_CAP_DRAW_PARAMETERS:
+        case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
+        case PIPE_CAP_MULTI_DRAW_INDIRECT:
+        case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
+        case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
+        case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
+        case PIPE_CAP_INVALIDATE_BUFFER:
+        case PIPE_CAP_GENERATE_MIPMAP:
+        case PIPE_CAP_STRING_MARKER:
+        case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
+        case PIPE_CAP_QUERY_BUFFER_OBJECT:
+        case PIPE_CAP_QUERY_MEMORY_INFO:
+        case PIPE_CAP_PCI_GROUP:
+        case PIPE_CAP_PCI_BUS:
+        case PIPE_CAP_PCI_DEVICE:
+        case PIPE_CAP_PCI_FUNCTION:
+        case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+        case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
+        case PIPE_CAP_TGSI_VOTE:
+        case PIPE_CAP_MAX_WINDOW_RECTANGLES:
+        case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
+        case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
+        case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+        case PIPE_CAP_NATIVE_FENCE_FD:
+        case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
+        case PIPE_CAP_TGSI_FS_FBFETCH:
+        case PIPE_CAP_TGSI_MUL_ZERO_WINS:
+        case PIPE_CAP_TGSI_CLOCK:
+        case PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE:
+        case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
+        case PIPE_CAP_TGSI_BALLOT:
+        case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+        case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
+        case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
+        case PIPE_CAP_POST_DEPTH_COVERAGE:
+        case PIPE_CAP_BINDLESS_TEXTURE:
+        case PIPE_CAP_NIR_SAMPLERS_AS_DEREF:
+        case PIPE_CAP_MEMOBJ:
+        case PIPE_CAP_LOAD_CONSTBUF:
+        case PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS:
+        case PIPE_CAP_TILE_RASTER_ORDER:
+        case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
+        case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
+        case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+        case PIPE_CAP_FENCE_SIGNAL:
+        case PIPE_CAP_CONSTBUF0_FLAGS:
+                return 0;
+
+        case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
+                return 4;
+
+        default:
+                debug_printf("Unexpected PIPE_CAP %d query\n", param);
+                return 0;
+        }
+}
+
+static int
+panfrost_get_shader_param(struct pipe_screen *screen,
+                          enum pipe_shader_type shader,
+                          enum pipe_shader_cap param)
+{
+        if (shader != PIPE_SHADER_VERTEX &&
+                        shader != PIPE_SHADER_FRAGMENT) {
+                return 0;
+        }
+
+        /* this is probably not totally correct.. but it's a start: */
+        switch (param) {
+        case PIPE_SHADER_CAP_SCALAR_ISA:
+                return 0;
+
+        case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
+        case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
+        case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
+        case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
+                return 16384;
+
+        case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
+                return 1024;
+
+        case PIPE_SHADER_CAP_MAX_INPUTS:
+                return 16;
+
+        case PIPE_SHADER_CAP_MAX_OUTPUTS:
+                return shader == PIPE_SHADER_FRAGMENT ? 1 : 8;
+
+        case PIPE_SHADER_CAP_MAX_TEMPS:
+                return 256; /* GL_MAX_PROGRAM_TEMPORARIES_ARB */
+
+        case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
+                return 16 * 1024 * sizeof(float);
+
+        case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
+                return 1;
+
+        case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
+                return 0;
+
+        case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
+        case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
+        case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
+                return 0;
+
+        case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
+                return 1;
+
+        case PIPE_SHADER_CAP_SUBROUTINES:
+                return 0;
+
+        case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
+                return 0;
+
+        case PIPE_SHADER_CAP_INTEGERS:
+                return 1;
+
+        case PIPE_SHADER_CAP_INT64_ATOMICS:
+        case PIPE_SHADER_CAP_FP16:
+        case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
+        case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
+        case PIPE_SHADER_CAP_TGSI_LDEXP_SUPPORTED:
+        case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
+        case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
+                return 0;
+
+        case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
+        case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
+                return 16; /* XXX: How many? */
+
+        case PIPE_SHADER_CAP_PREFERRED_IR:
+                return PIPE_SHADER_IR_NIR;
+
+        case PIPE_SHADER_CAP_SUPPORTED_IRS:
+                return 0;
+
+        case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+                return 32;
+
+        case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
+        case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
+        case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
+        case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
+        case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS:
+        case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS:
+                return 0;
+
+        default:
+                fprintf(stderr, "unknown shader param %d\n", param);
+                return 0;
+        }
+
+        return 0;
+}
+
+static float
+panfrost_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
+{
+        switch (param) {
+        case PIPE_CAPF_MAX_LINE_WIDTH:
+
+        /* fall-through */
+        case PIPE_CAPF_MAX_LINE_WIDTH_AA:
+                return 255.0; /* arbitrary */
+
+        case PIPE_CAPF_MAX_POINT_WIDTH:
+
+        /* fall-through */
+        case PIPE_CAPF_MAX_POINT_WIDTH_AA:
+                return 255.0; /* arbitrary */
+
+        case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
+                return 16.0;
+
+        case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
+                return 16.0; /* arbitrary */
+
+        default:
+                debug_printf("Unexpected PIPE_CAPF %d query\n", param);
+                return 0.0;
+        }
+}
+
+/**
+ * Query format support for creating a texture, drawing surface, etc.
+ * \param format  the format to test
+ * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
+ */
+static boolean
+panfrost_is_format_supported( struct pipe_screen *screen,
+                              enum pipe_format format,
+                              enum pipe_texture_target target,
+                              unsigned sample_count,
+                              unsigned storage_sample_count,
+                              unsigned bind)
+{
+        const struct util_format_description *format_desc;
+
+        assert(target == PIPE_BUFFER ||
+               target == PIPE_TEXTURE_1D ||
+               target == PIPE_TEXTURE_1D_ARRAY ||
+               target == PIPE_TEXTURE_2D ||
+               target == PIPE_TEXTURE_2D_ARRAY ||
+               target == PIPE_TEXTURE_RECT ||
+               target == PIPE_TEXTURE_3D ||
+               target == PIPE_TEXTURE_CUBE ||
+               target == PIPE_TEXTURE_CUBE_ARRAY);
+
+        format_desc = util_format_description(format);
+
+        if (!format_desc)
+                return FALSE;
+
+        if (sample_count > 1)
+                return FALSE;
+
+        /* Format wishlist */
+        if (format == PIPE_FORMAT_Z24X8_UNORM || format == PIPE_FORMAT_X8Z24_UNORM)
+                return FALSE;
+
+        if (bind & PIPE_BIND_RENDER_TARGET) {
+                /* We don't support rendering into anything but RGBA8 yet. We
+                 * need more formats for spec compliance, but for now, honesty
+                 * is the best policy <3 */
+
+                if (!util_format_is_rgba8_variant(format_desc))
+                        return FALSE;
+
+                if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
+                        return FALSE;
+
+                /*
+                 * Although possible, it is unnatural to render into compressed or YUV
+                 * surfaces. So disable these here to avoid going into weird paths
+                 * inside the state trackers.
+                 */
+                if (format_desc->block.width != 1 ||
+                                format_desc->block.height != 1)
+                        return FALSE;
+        }
+
+        if (bind & PIPE_BIND_DEPTH_STENCIL) {
+                if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
+                        return FALSE;
+        }
+
+        if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC ||
+                        format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC) {
+                /* Compressed formats not yet hooked up. */
+                return FALSE;
+        }
+
+        if ((bind & (PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW)) &&
+                        ((bind & PIPE_BIND_DISPLAY_TARGET) == 0) &&
+                        target != PIPE_BUFFER) {
+                const struct util_format_description *desc =
+                        util_format_description(format);
+
+                if (desc->nr_channels == 3 && desc->is_array) {
+                        /* Don't support any 3-component formats for rendering/texturing
+                         * since we don't support the corresponding 8-bit 3 channel UNORM
+                         * formats.  This allows us to support GL_ARB_copy_image between
+                         * GL_RGB8 and GL_RGB8UI, for example.  Otherwise, we may be asked to
+                         * do a resource copy between PIPE_FORMAT_R8G8B8_UINT and
+                         * PIPE_FORMAT_R8G8B8X8_UNORM, for example, which will not work
+                         * (different bpp).
+                         */
+                        return FALSE;
+                }
+        }
+
+        return TRUE;
+}
+
+
+static void
+panfrost_destroy_screen( struct pipe_screen *screen )
+{
+        FREE(screen);
+}
+
+static void
+panfrost_flush_frontbuffer(struct pipe_screen *_screen,
+                           struct pipe_resource *resource,
+                           unsigned level, unsigned layer,
+                           void *context_private,
+                           struct pipe_box *sub_box)
+{
+        /* TODO: Display target integration */
+}
+
+static uint64_t
+panfrost_get_timestamp(struct pipe_screen *_screen)
+{
+        return os_time_get_nano();
+}
+
+static void
+panfrost_fence_reference(struct pipe_screen *screen,
+                         struct pipe_fence_handle **ptr,
+                         struct pipe_fence_handle *fence)
+{
+        *ptr = fence;
+}
+
+static boolean
+panfrost_fence_finish(struct pipe_screen *screen,
+                      struct pipe_context *ctx,
+                      struct pipe_fence_handle *fence,
+                      uint64_t timeout)
+{
+        assert(fence);
+        return TRUE;
+}
+
+static const void *
+panfrost_screen_get_compiler_options(struct pipe_screen *pscreen,
+                                     enum pipe_shader_ir ir,
+                                     enum pipe_shader_type shader)
+{
+        return NULL;
+}
+
+struct pipe_screen *
+panfrost_create_screen(int fd, struct renderonly *ro, bool is_drm)
+{
+        struct panfrost_screen *screen = CALLOC_STRUCT(panfrost_screen);
+
+        if (!screen)
+                return NULL;
+
+        if (ro) {
+                screen->ro = renderonly_dup(ro);
+                if (!screen->ro) {
+                        fprintf(stderr, "Failed to dup renderonly object\n");
+                        free(screen);
+                        return NULL;
+                }
+        }
+
+        screen->base.destroy = panfrost_destroy_screen;
+
+        screen->base.get_name = panfrost_get_name;
+        screen->base.get_vendor = panfrost_get_vendor;
+        screen->base.get_device_vendor = panfrost_get_device_vendor;
+        screen->base.get_param = panfrost_get_param;
+        screen->base.get_shader_param = panfrost_get_shader_param;
+        screen->base.get_paramf = panfrost_get_paramf;
+        screen->base.get_timestamp = panfrost_get_timestamp;
+        screen->base.is_format_supported = panfrost_is_format_supported;
+        //screen->base.context_create = panfrost_create_context;
+        screen->base.flush_frontbuffer = panfrost_flush_frontbuffer;
+        screen->base.get_compiler_options = panfrost_screen_get_compiler_options;
+        screen->base.fence_reference = panfrost_fence_reference;
+        screen->base.fence_finish = panfrost_fence_finish;
+
+	screen->last_fragment_id = -1;
+	screen->last_fragment_flushed = true;
+
+        fprintf(stderr, "stub: Upstream panfrost (use downstream fork)\n");
+        return NULL;
+}