Hi all,
I try use a render encoder to draw some points on my texture, but I Found build a pipelinestate with colorAttachment[0].textrue = myTextrue, it is not work .
how to draw points on my texture (had some contents on this texture)
my metal file is like this:
#include <metal_stdlib>
using namespace metal;
struct VertexInOut
{
float4 m_Position [[position]];
float point_size [[point_size]];
float2 m_TexCoord [[user(texturecoord)]];
};
vertex VertexInOut pointSpiritVertex(device float4 *pPosition[[ buffer(0) ]],
constant packed_float2 *pTexCoords[[ buffer(1) ]],
uint vid[[ vertex_id ]] )
{
VertexInOut outVertices;
outVertices.m_Position = pPosition[vid]; /
outVertices.m_TexCoord = pTexCoords[vid];
outVertices.point_size = 100;
return outVertices;
}
fragment half4 pointSpiritFragment(VertexInOut inFrag[[ stage_in ]], texture2d<half> inTex[[texture(0)]], texture2d<half> outTex[[texture(1)]])
{
half4 outColor = half4(1.0, 0.0, 0.0, 1.0);
constexpr sampler qsampler;
half4 srcColor = inTex.sample(qsampler, inFrag.m_TexCoord);
outColor = srcColor ;
return outColor;
}
And encoder like this:
[renderEncoder setVertexBuffer:self.verticsBuffer offset:0 atIndex: 0 ];
[renderEncoder setVertexBuffer:self.coordBuffer offset:0 atIndex: 1];
[renderEncoder setFragmentTexture:firstInputTexture.texture atIndex:0];
[renderEncoder setFragmentTexture:outputTexture.texture atIndex:1];
[renderEncoder setRenderPipelineState:_renderpipelineState];
[renderEncoder drawPrimitives:MTLPrimitiveTypePoint vertexStart:0 vertexCount:4 instanceCount:1];
[renderEncoder endEncoding];
