jp9000/obs-studio
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

libobs: Full-screen triangle format conversions

Browse Source 
The cache coherency of rasterization for full-screen passes is better
using an oversized triangle that is clipped rather than two triangles.
Traversal order of rasterization is GPU-specific, but will almost
certainly be better using an undivided primitive.

A smaller benefit is that quads along the diagonal are not evaluated
multiple times, but that's minor in comparison.

Redo format shaders to bypass vertex buffer, and input layout. Add
global shader bool "obs_glsl_compile" to make API-specific decisions,
i.e. handle upside-down UVs. gl_ortho is not needed for format
conversion because the vertex shader does not use ViewProj anymore.

This can be applied to more situations, but start small first.

Testbed full screen passes, Intel HD Graphics 530:
RGBA -> UYVX: 467 -> 439 us, ~6% savings
UYVX -> uv: 295 -> 239 us, ~19% savings
This commit is contained in:
James Park
2019-06-02 06:49:38 -07:00
committed by jp9000
parent 6a795d52ea
commit aa22b61e3e
9 changed files with 67 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
libobs/data/format_conversion.effect
View File

@@ -17,8 +17,6 @@
//#define DEBUGGING
uniform float4x4 ViewProj;
uniform float u_plane_offset;
uniform float v_plane_offset;
@@ -59,11 +57,20 @@ struct VertInOut {
float2 uv : TEXCOORD0;
};
VertInOut VSDefault(VertInOut vert_in)
VertInOut VSDefault(uint id : VERTEXID)
{
float idHigh = float(id >> 1);
float idLow = float(id & uint(1));
float x = idHigh * 4.0 - 1.0;
float y = idLow * 4.0 - 1.0;
float u = idHigh * 2.0;
float v = obs_glsl_compile ? (idLow * 2.0) : (1.0 - idLow * 2.0);
VertInOut vert_out;
vert_out.pos = mul(float4(vert_in.pos.xyz, 1.0), ViewProj);
vert_out.uv = vert_in.uv;
vert_out.pos = float4(x, y, 0.0, 1.0);
vert_out.uv = float2(u, v);
return vert_out;
}
@@ -407,7 +414,7 @@ technique Planar420
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPlanar420(vert_in);
}
}
@@ -416,7 +423,7 @@ technique Planar444
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPlanar444(vert_in);
}
}
@@ -425,7 +432,7 @@ technique NV12
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSNV12(vert_in);
}
}
@@ -434,7 +441,7 @@ technique NV12_Y
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSNV12_Y(vert_in);
}
}
@@ -443,7 +450,7 @@ technique NV12_UV
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSNV12_UV(vert_in);
}
}
@@ -452,7 +459,7 @@ technique UYVY_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPacked422_Reverse(vert_in, 2, 0, 1, 3);
}
}
@@ -461,7 +468,7 @@ technique YUY2_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPacked422_Reverse(vert_in, 1, 3, 2, 0);
}
}
@@ -470,7 +477,7 @@ technique YVYU_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPacked422_Reverse(vert_in, 3, 1, 2, 0);
}
}
@@ -479,7 +486,7 @@ technique I420_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPlanar420_Reverse(vert_in);
}
}
@@ -488,7 +495,7 @@ technique I444_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSPlanar444_Reverse(vert_in);
}
}
@@ -497,7 +504,7 @@ technique NV12_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSNV12_Reverse(vert_in);
}
}
@@ -506,7 +513,7 @@ technique Y800_Limited
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSY800_Limited(vert_in);
}
}
@@ -515,7 +522,7 @@ technique Y800_Full
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSY800_Full(vert_in);
}
}
@@ -524,7 +531,7 @@ technique RGB_Limited
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSRGB_Limited(vert_in);
}
}
@@ -533,7 +540,7 @@ technique BGR3_Limited
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSBGR3_Limited(vert_in);
}
}
@@ -542,7 +549,7 @@ technique BGR3_Full
{
pass
{
vertex_shader = VSDefault(vert_in);
vertex_shader = VSDefault(id);
pixel_shader = PSBGR3_Full(vert_in);
}
}