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win32: add opacity shader to overlay

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This commit is contained in:
OV2 2013-03-28 14:29:04 +01:00
parent b782ec2d33
commit 66b4b45f5c
2 changed files with 53 additions and 7 deletions
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54
gfx/d3d9/d3d9.cpp
View File

@ -496,6 +496,10 @@ D3DVideo::~D3DVideo()
overlay.tex->Release();
if(overlay.vert_buf)
overlay.vert_buf->Release();
if(overlay.opacity_shader)
overlay.opacity_shader->Release();
if(overlay.opacity_shader_table)
overlay.opacity_shader_table->Release();
#endif
if (dev)
dev->Release();
@ -1235,12 +1239,21 @@ void D3DVideo::overlay_set_alpha(float mod)
overlay.overlay_alpha_mod = mod;
}
static const char *opacity_fragment =
"uniform float opacity;\n"
"float4 main_fragment(uniform sampler2D samp, float2 tex : TEXCOORD0) : COLOR\n"
"{\n"
" float4 col = tex2D(samp, tex);\n"
" col.a *= opacity;\n"
" return col;\n"
"}";
void D3DVideo::overlay_render()
{
struct overlay_vertex
{
float x,y, z;
float u,v;
float x, y, z;
float u, v;
} vert[4];
if(!overlay.vert_buf) {
@ -1289,19 +1302,21 @@ void D3DVideo::overlay_render()
std::memcpy(verts, vert, sizeof(vert));
overlay.vert_buf->Unlock();
// enable alpha
dev->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
dev->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
dev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
// set vertex decl for overlay
D3DVERTEXELEMENT9 vElems[4] = {
{0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0},
{0, 12, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},
D3DDECL_END()
};
IDirect3DVertexDeclaration9 * vertex_decl;
dev->CreateVertexDeclaration(vElems, &vertex_decl);
dev->SetVertexDeclaration(vertex_decl);
vertex_decl->Release();
dev->SetStreamSource(0, overlay.vert_buf, 0, sizeof(overlay_vertex));
@ -1329,6 +1344,32 @@ void D3DVideo::overlay_render()
dev->Clear(2, clear_rects, D3DCLEAR_TARGET, 0, 1, 0);
}
// custom pixel shader for opacity
IDirect3DPixelShader9 *prev_pixel_shader = NULL;
if(overlay.overlay_alpha_mod != 1.0f)
{
if(!overlay.opacity_shader)
{
LPD3DXBUFFER code;
D3DXCompileShader(opacity_fragment, // source
strlen(opacity_fragment), // len
NULL, // macros
NULL, // includes
"main_fragment", // main function
"ps_2_0", // shader profile
0, // flags
&code, // compiled operations
NULL, // errors
&overlay.opacity_shader_table); // constants
dev->CreatePixelShader((DWORD*)code->GetBufferPointer(), &overlay.opacity_shader);
code->Release();
}
overlay.opacity_shader_table->SetFloat(dev, "opacity", overlay.overlay_alpha_mod);
dev->GetPixelShader(&prev_pixel_shader);
dev->SetPixelShader(overlay.opacity_shader);
}
// render overlay
dev->SetTexture(0, overlay.tex);
dev->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_BORDER);
dev->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_BORDER);
@ -1339,9 +1380,12 @@ void D3DVideo::overlay_render()
dev->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
dev->EndScene();
}
dev->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE);
//restore previous state
dev->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
dev->SetViewport(&final_viewport);
vertex_decl->Release();
if(prev_pixel_shader)
dev->SetPixelShader(prev_pixel_shader);
}
#endif

2
gfx/d3d9/d3d9.hpp
View File

@ -127,6 +127,8 @@ class D3DVideo
float overlay_alpha_mod;
IDirect3DTexture9 *tex;
IDirect3DVertexBuffer9 *vert_buf;
IDirect3DPixelShader9 *opacity_shader;
ID3DXConstantTable *opacity_shader_table;
} overlay;
#endif
};