c++ - 错误 X8000 : D3D11 Internal Compiler error : Invalid Bytecode: Invalid operand type for operand #1 of opcode #86 (counts are 1-based)

Question

我和我的讲师/实验室助理都被难住了。

出于某种原因，以下 HLSL 代码在输出窗口中返回:

error X8000 : D3D11 Internal Compiler error : Invalid Bytecode: Invalid operand type for operand #1 of opcode #86 (counts are 1-based).

这是 HLSL 中导致问题的函数:

// Projects a sphere diameter large in screen space to calculate desired tesselation factor
float SphereToScreenSpaceTessellation(float3 p0, float3 p1, float diameter)
{
float3 centerPoint = (p0 + p1) * 0.5f;

float4 point0 = mul( float4(centerPoint,1.0f) , gTileWorldView);

float4 point1 = point0;
point1.x += diameter;

float4 point0ClipSpace = mul(point0, gTileProj);
float4 point1ClipSpace = mul(point1, gTileProj);

point0ClipSpace /= point0ClipSpace.w;
point1ClipSpace /= point1ClipSpace.w;

point0ClipSpace.xy *= gScreenSize;
point1ClipSpace.xy *= gScreenSize;

float projSizeOfEdge = distance(point0ClipSpace, point1ClipSpace);

float result = projSizeOfEdge / gTessellatedTriWidth;

return clamp(result, 0, 64);
}

我已将其缩小到可能是“mul”内在函数的程度。我们已经从代码中取出所有内容并尝试返回一个像这样的临时变量，它工作正常:

float SphereToScreenSpaceTessellation(float3 p0, float3 p1, float diameter)
{

float temp = 0;

float3 centerPoint = (p0 + p1) * 0.5f;

float4 point0 = mul( float4(centerPoint,1.0f) , gTileWorldView);

float4 point1 = point0;
point1.x += diameter;

float4 point0ClipSpace = mul(point0, gTileProj);
float4 point1ClipSpace = mul(point1, gTileProj);

point0ClipSpace /= point0ClipSpace.w;
point1ClipSpace /= point1ClipSpace.w;

point0ClipSpace.xy *= gScreenSize;
point1ClipSpace.xy *= gScreenSize;

float projSizeOfEdge = distance(point0ClipSpace, point1ClipSpace);

float result = projSizeOfEdge / gTessellatedTriWidth;

return temp;
//return clamp(result, 0, 64);
}

如果有人想知道:

gTileWorldView, gTileProj are float4x4's in a .hlsli file
gScreenSize is a float2 in a .hlsli file.
gTessellatedTriWidth is a float in a .hlsli file.

以下函数是 2011 NVidia 着色器中的状态:http://dx11-xpr.googlecode.com/svn/trunk/XPR/Media/Effects/TerrainTessellation.fx

我尝试复制并粘贴他们的解决方案，用上面的解决方案替换他们的变量，但出现了所列的相同错误。

我完全被难住了，我需要帮助才能完成这项任务，请帮忙。

Answer 1

检查这一行:

point0ClipSpace.xy *= gScreenSize;

gScreenSize 是 float2 吗？我不相信你可以将一个 vec 乘以任何 vec 类型。