wined3d: Detect vertex shader 2.0 support using a pixel shader 2.0 limit.

Without this vertex shader 3.0 is reported on non-Nvidia cards that only support vertex shader 2.0. Reporting 3.0 would result in slow software rendering as it is much more advanced than 2.0.

wined3d: Detect vertex shader 2.0 support using a pixel shader 2.0 limit.
efc18d79 · Roderick Colenbrander · Alexandre Julliard · 6760ce83 · efc18d79
Commit efc18d79 authored Oct 27, 2007 by Roderick Colenbrander Committed by Alexandre Julliard Oct 29, 2007
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directx.c dlls/wined3d/directx.c +7 -4

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--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -2367,10 +2367,13 @@ static HRESULT WINAPI IWineD3DImpl_GetDeviceCaps(IWineD3D *iface, UINT Adapter, 

    if (vs_selected_mode == SHADER_GLSL) {
        /* Nvidia Geforce6/7 or Ati R4xx/R5xx cards with GLSL support, support VS 3.0 but older Nvidia/Ati
-           models with GLSL support only support 2.0. In case of nvidia we can detect VS 2.0 support using
-           vs_nv_version which is based on NV_vertex_program. For Ati cards there's no easy way, so for
-           now only support 2.0/3.0 detection on Nvidia GeforceFX cards and default to 3.0 for everything else */
-        if(GLINFO_LOCATION.vs_nv_version == VS_VERSION_20)
+         * models with GLSL support only support 2.0. In case of nvidia we can detect VS 2.0 support using
+         * vs_nv_version which is based on NV_vertex_program.
+         * For Ati cards there's no way using glsl (it abstracts the lowlevel info away) and also not
+         * using ARB_vertex_program. It is safe to assume that when a card supports pixel shader 2.0 it
+         * supports vertex shader 2.0 too and the way around. We can detect ps2.0 using the maximum number
+         * of native instructions, so use that here. For more info see the pixel shader versioning code below. */
+        if((GLINFO_LOCATION.vs_nv_version == VS_VERSION_20) || (GLINFO_LOCATION.ps_arb_max_instructions <= 512))
            *pCaps->VertexShaderVersion = WINED3DVS_VERSION(2,0);
        else
            *pCaps->VertexShaderVersion = WINED3DVS_VERSION(3,0);