mirror of
https://github.com/SerenityOS/serenity.git
synced 2026-11-07 04:29:30 -10:00
Sönke Holz
7e510d374a
This initial version of the driver only supports glClear{,Color,Depth}()
for now.
Since the only publicly available documentation for the VideoCore 3D
architecture (the VideoCore IV 3D Architecture Reference Guide) just
covers an older revision of the VideoCore 3D architecture, I used
Mesa's v3d_packet.xml as a reference to get definitions for the control
records of the VideoCore VII.
To determine which control records need to be generated for a minimal
example, I used Mesa's `V3D_DEBUG` environment variable and set it to
`cl` to make it dump the control lists it generates for a basic OpenGL
test program.
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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* Copyright (c) 2025-2026, Sönke Holz <[email protected]>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Buffer.h"
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#include "Definitions.h"
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#include <Kernel/API/V3D.h>
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#include <LibCore/System.h>
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#include <sys/mman.h>
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namespace V3DGPU {
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extern int g_v3d_fd;
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Buffer::~Buffer()
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{
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// The size of moved-from buffers is set to 0.
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if (m_size == 0)
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return;
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VERIFY(m_mmap_address != nullptr);
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if (auto result = Core::System::munmap(m_mmap_address, m_size); result.is_error())
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dbgln("LibV3DGPU: ~Buffer(): munmap({}, {:#x}) failed: {}", m_mmap_address, m_size, result.release_error());
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if (auto result = Core::System::ioctl(g_v3d_fd, V3D_FREE_BUFFER, m_gpu_virtual_address); result.is_error())
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dbgln("LibV3DGPU: ~Buffer(): ioctl({}, V3D_FREE_BUFFER, {:#x}) failed: {}", g_v3d_fd, m_gpu_virtual_address, result.release_error());
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}
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ErrorOr<Buffer> Buffer::create(u32 size, StringView name)
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{
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VERIFY(size != 0);
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VERIFY(size % V3D_PAGE_SIZE == 0);
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V3DBuffer buffer = {
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.size = size,
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// Will be filled by the kernel.
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.gpu_virtual_address = 0,
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};
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TRY(Core::System::ioctl(g_v3d_fd, V3D_ALLOCATE_BUFFER, &buffer));
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VERIFY(buffer.gpu_virtual_address != 0);
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auto* mmap_address = TRY(Core::System::mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_RANDOMIZED, g_v3d_fd, buffer.gpu_virtual_address, 0, name));
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return Buffer(buffer.gpu_virtual_address, buffer.size, mmap_address);
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}
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}
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