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GPU/HW: Support SSBOs instead of texture buffers for VRAM writes

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This commit is contained in:
Connor McLaughlin
2020-06-24 01:39:53 +10:00
parent eec37df1e0
commit 08ef8c1e8d
6 changed files with 44 additions and 13 deletions
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22
src/core/gpu_hw_opengl.cpp
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@ -181,7 +181,16 @@ void GPU_HW_OpenGL::SetCapabilities(HostDisplay* host_display)
}
else
{
Log_WarningPrintf("Texture buffers are not supported, VRAM writes will be slower.");
// Try SSBOs.
GLint64 max_ssbo_size = 0;
if (GLAD_GL_VERSION_4_3 || GLAD_GL_ES_VERSION_3_1 || GLAD_GL_ARB_shader_storage_buffer_object)
glGetInteger64v(GL_MAX_SHADER_STORAGE_BLOCK_SIZE, &max_ssbo_size);
m_use_ssbo_for_vram_writes = (max_ssbo_size >= (VRAM_WIDTH * VRAM_HEIGHT * sizeof(u16)));
if (m_use_ssbo_for_vram_writes)
Log_InfoPrintf("Using shader storage buffers for VRAM writes.");
else
Log_WarningPrintf("Texture buffers are not supported, VRAM writes will be slower.");
}
int max_dual_source_draw_buffers = 0;
@ -484,10 +493,10 @@ bool GPU_HW_OpenGL::CompilePrograms()
prog->Uniform1i("samp0", 0);
m_vram_update_depth_program = std::move(*prog);
if (m_supports_texture_buffer)
if (m_supports_texture_buffer || m_use_ssbo_for_vram_writes)
{
prog = m_shader_cache.GetProgram(shadergen.GenerateScreenQuadVertexShader(), {},
shadergen.GenerateVRAMWriteFragmentShader(),
shadergen.GenerateVRAMWriteFragmentShader(m_use_ssbo_for_vram_writes),
[this, use_binding_layout](GL::Program& prog) {
if (!IsGLES() && !use_binding_layout)
prog.BindFragData(0, "o_col0");
@ -751,7 +760,7 @@ void GPU_HW_OpenGL::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void*
GPU_HW::UpdateVRAM(x, y, width, height, data);
const u32 num_pixels = width * height;
if (num_pixels < m_max_texture_buffer_size)
if (num_pixels < m_max_texture_buffer_size || m_use_ssbo_for_vram_writes)
{
const auto map_result = m_texture_stream_buffer->Map(sizeof(u16), num_pixels * sizeof(u16));
std::memcpy(map_result.pointer, data, num_pixels * sizeof(u16));
@ -771,7 +780,10 @@ void GPU_HW_OpenGL::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void*
glDepthFunc(m_GPUSTAT.check_mask_before_draw ? GL_GEQUAL : GL_ALWAYS);
m_vram_write_program.Bind();
glBindTexture(GL_TEXTURE_BUFFER, m_texture_buffer_r16ui_texture);
if (m_use_ssbo_for_vram_writes)
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, m_texture_stream_buffer->GetGLBufferId());
else
glBindTexture(GL_TEXTURE_BUFFER, m_texture_buffer_r16ui_texture);
const VRAMWriteUBOData uniforms = {x,
flipped_y,