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GPU/HW: Use dual-source blend to split alpha and mask

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This commit is contained in:
Connor McLaughlin
2019-11-24 23:23:33 +10:00
parent 9d6d00480c
commit bc5a247a4b
5 changed files with 62 additions and 14 deletions
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23
src/core/gpu_hw_opengl.cpp
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@ -144,6 +144,12 @@ void GPU_HW_OpenGL::SetCapabilities(HostDisplay* host_display)
{
Log_WarningPrintf("Texture buffers are not supported, VRAM writes will be slower.");
}
int max_dual_source_draw_buffers = 0;
glGetIntegerv(GL_MAX_DUAL_SOURCE_DRAW_BUFFERS, &max_dual_source_draw_buffers);
m_supports_dual_source_blend = (max_dual_source_draw_buffers > 0);
if (!m_supports_dual_source_blend)
Log_WarningPrintf("Dual-source blending is not supported, this may break some mask effects.");
}
void GPU_HW_OpenGL::CreateFramebuffer()
@ -256,7 +262,8 @@ void GPU_HW_OpenGL::CreateTextureBuffer()
bool GPU_HW_OpenGL::CompilePrograms()
{
GPU_HW_ShaderGen shadergen(m_host_display->GetRenderAPI(), m_resolution_scale, m_true_color);
GPU_HW_ShaderGen shadergen(m_host_display->GetRenderAPI(), m_resolution_scale, m_true_color,
m_supports_dual_source_blend);
for (u32 render_mode = 0; render_mode < 4; render_mode++)
{
@ -310,7 +317,17 @@ bool GPU_HW_OpenGL::CompilePrograms()
return false;
if (!m_is_gles)
prog.BindFragData(0, "o_col0");
{
if (m_supports_dual_source_blend)
{
prog.BindFragDataIndexed(0, "o_col0");
prog.BindFragDataIndexed(1, "o_col1");
}
else
{
prog.BindFragData(0, "o_col0");
}
}
if (!prog.Link())
return false;
@ -381,7 +398,7 @@ void GPU_HW_OpenGL::SetDrawState(BatchRenderMode render_mode)
glBlendEquationSeparate(
m_batch.transparency_mode == TransparencyMode::BackgroundMinusForeground ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD,
GL_FUNC_ADD);
glBlendFuncSeparate(GL_ONE, GL_SRC_ALPHA, GL_ONE, GL_ZERO);
glBlendFuncSeparate(GL_ONE, m_supports_dual_source_blend ? GL_SRC1_ALPHA : GL_SRC_ALPHA, GL_ONE, GL_ZERO);
}
if (m_drawing_area_changed)