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GPU: Use streaming buffers for CPU->VRAM transfers

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This commit is contained in:
Connor McLaughlin
2019-11-02 22:31:15 +10:00
parent 407fee9ec3
commit 2b17cfd365
3 changed files with 20 additions and 5 deletions
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21
src/core/gpu_hw_opengl.cpp
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@ -23,6 +23,7 @@ bool GPU_HW_OpenGL::Initialize(System* system, DMA* dma, InterruptController* in
CreateFramebuffer();
CreateVertexBuffer();
CreateTextureBuffer();
if (!CompilePrograms())
return false;
@ -251,6 +252,13 @@ void GPU_HW_OpenGL::CreateVertexBuffer()
glGenVertexArrays(1, &m_attributeless_vao_id);
}
void GPU_HW_OpenGL::CreateTextureBuffer()
{
m_texture_stream_buffer = GL::StreamBuffer::Create(GL_PIXEL_UNPACK_BUFFER, VRAM_UPDATE_TEXTURE_BUFFER_SIZE);
if (!m_texture_stream_buffer)
Panic("Failed to create texture stream buffer");
}
bool GPU_HW_OpenGL::CompilePrograms()
{
for (u32 render_mode = 0; render_mode < 4; render_mode++)
@ -564,12 +572,13 @@ void GPU_HW_OpenGL::FillVRAM(u32 x, u32 y, u32 width, u32 height, u16 color)
void GPU_HW_OpenGL::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data)
{
std::vector<u32> rgba_data;
rgba_data.reserve(width * height);
const u32 num_pixels = width * height;
const auto map_result = m_texture_stream_buffer->Map(sizeof(u32), num_pixels * sizeof(u32));
// reverse copy the rows so it matches opengl's lower-left origin
const u32 source_stride = width * sizeof(u16);
const u8* source_ptr = static_cast<const u8*>(data) + (source_stride * (height - 1));
u32* dest_ptr = static_cast<u32*>(map_result.pointer);
for (u32 row = 0; row < height; row++)
{
const u8* source_row_ptr = source_ptr;
@ -580,13 +589,14 @@ void GPU_HW_OpenGL::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void*
std::memcpy(&src_col, source_row_ptr, sizeof(src_col));
source_row_ptr += sizeof(src_col);
const u32 dst_col = RGBA5551ToRGBA8888(src_col);
rgba_data.push_back(dst_col);
*(dest_ptr++) = RGBA5551ToRGBA8888(src_col);
}
source_ptr -= source_stride;
}
m_texture_stream_buffer->Unmap(num_pixels * sizeof(u32));
// have to write to the 1x texture first
if (m_resolution_scale > 1)
m_vram_downsample_texture->Bind();
@ -597,7 +607,8 @@ void GPU_HW_OpenGL::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void*
const u32 flipped_y = VRAM_HEIGHT - y - height;
// update texture data
glTexSubImage2D(GL_TEXTURE_2D, 0, x, flipped_y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, rgba_data.data());
glTexSubImage2D(GL_TEXTURE_2D, 0, x, flipped_y, width, height, GL_RGBA, GL_UNSIGNED_BYTE,
reinterpret_cast<void*>(map_result.index_aligned * sizeof(u32)));
InvalidateVRAMReadCache();
if (m_resolution_scale > 1)