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GPU: Implement transparency mode

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This commit is contained in:
Connor McLaughlin
2019-09-19 00:55:06 +10:00
parent 23ef1cafbd
commit d84bffead1
5 changed files with 52 additions and 19 deletions
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31
src/pse/gpu_hw_opengl.cpp
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@ -191,6 +191,36 @@ void GPU_HW_OpenGL::SetScissor()
glScissor(x, y, width, height);
}
void GPU_HW_OpenGL::SetBlendState()
{
struct BlendVars
{
GLenum src_factor;
GLenum func;
GLenum dst_factor;
float color;
};
static const std::array<BlendVars, 4> blend_vars = {{
{GL_CONSTANT_COLOR, GL_FUNC_ADD, GL_CONSTANT_COLOR, 0.5f}, // B/2 + F/2
{GL_ONE, GL_FUNC_ADD, GL_ONE, -1.0f}, // B + F
{GL_ONE, GL_FUNC_REVERSE_SUBTRACT, GL_ONE, -1.0f}, // B - F
{GL_CONSTANT_COLOR, GL_FUNC_ADD, GL_ONE, 0.25f} // B + F/4
}};
if (!m_batch_command.IsTransparencyEnabled())
{
glDisable(GL_BLEND);
return;
}
const BlendVars& vars = blend_vars[static_cast<u8>(m_texture_config.transparency_mode)];
glEnable(GL_BLEND);
glBlendFuncSeparate(vars.src_factor, vars.dst_factor, GL_ONE, GL_ZERO);
glBlendEquationSeparate(vars.func, GL_FUNC_ADD);
if (vars.color >= 0.0f)
glBlendColor(vars.color, vars.color, vars.color, 1.0f);
}
void GPU_HW_OpenGL::UpdateDisplay()
{
GPU_HW::UpdateDisplay();
@ -322,6 +352,7 @@ void GPU_HW_OpenGL::FlushRender()
SetProgram(m_batch_command.IsTextureEnabled(), m_batch_command.IsTextureBlendingEnabled());
SetViewport();
SetScissor();
SetBlendState();
glBindFramebuffer(GL_FRAMEBUFFER, m_framebuffer_fbo_id);
glBindVertexArray(m_vao_id);