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我想從幾何着色器內的單個頂點(如POINT列表)中構建紋理四邊形。我現在無法解決的問題是沒有任何東西被渲染。我已經嘗試用Visual Studios的圖形調試器進行調試,並發現我的幾何着色器的輸出看起來是空的。HLSL幾何着色器空輸出
這是我的幾何着色器:
struct PS_INPUT
{
float4 position : SV_POSITION;
float2 texCoord : TEXCOORD;
};
struct VS_OUTPUT
{
float4 position : SV_POSITION;
float3 normal : NORMAL;
};
[maxvertexcount(4)]
void GS(
point VS_OUTPUT input[1],
inout TriangleStream<PS_INPUT> output
)
{
float3 decalNormal = input[0].normal;
float3 upVector = float3(0.0, 1.0f, 0.0f);
float3 frontVector = 0.2f * decalNormal;
// 2.0f = half-decal width
float3 rightVector = normalize(cross(decalNormal, upVector)) * 4.0f;
upVector = float3(0, 4.0f, 0);
float3 vertices[4] = { { 1, 0, 0 }, { 0, 0, 1 }, { -1, 0, 0 }, { 0, 0, -1 } };
vertices[0] = input[0].position.xyz - rightVector - upVector + frontVector; // Bottom Left
vertices[1] = input[0].position.xyz + rightVector - upVector + frontVector; // Bottom Right
vertices[2] = input[0].position.xyz - rightVector + upVector + frontVector; // Top Left
vertices[3] = input[0].position.xyz + rightVector + upVector + frontVector; // Top Right
float2 texCoord[4] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
texCoord[0] = float2(0, 1);
texCoord[1] = float2(1, 1);
texCoord[2] = float2(0, 0);
texCoord[3] = float2(1, 0);
PS_INPUT outputVert;
for (uint i = 0; i < 4; i++)
{
outputVert.position = float4(vertices[i], 1.0f);
outputVert.texCoord = texCoord[i];
output.Append(outputVert);
}
}
這是繪製調用流水線級的屏幕截圖。正如你可以看到頂點着色器內有3個像素,但幾何着色器之後沒有任何東西。
我已經禁用了所有撲殺:
D3D11_RASTERIZER_DESC rDesc;
ZeroMemory(&rDesc, sizeof(D3D11_RASTERIZER_DESC));
rDesc.FillMode = D3D11_FILL_SOLID;
rDesc.CullMode = D3D11_CULL_NONE; // no culling for now...
rDesc.FrontCounterClockwise = false;
rDesc.DepthClipEnable = false;
和深度測試:
dsDesc.DepthEnable = false;
而設置的一切是這樣的:
context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_POINTLIST);
context->RSSetState(m_pRasterizer);
context->IASetInputLayout(m_pInputLayout);
context->VSSetShader(m_pVS, 0, 0);
context->GSSetShader(m_pGS, 0, 0);
context->PSSetShader(m_pPS, 0, 0);
這裏有什麼問題?我認爲目前沒有像素着色器,因爲幾何着色器沒有輸出任何東西,是嗎? 謝謝!