我在具有不同统一参数的不同对象上重用我的金属像素和顶点着色器时遇到问题。我猜这与我错误地使用命令缓冲区有关。
当我运行我的金属应用程序时,几何图形正确绘制,但只有制服用于最终调用
renderCommand setFragmentBuffer:uniform_info offset:0 atIndex:UNIFORM_INFO_BUFFER_INDEX];
似乎将数据写入像素着色器。
我在这里剪切并粘贴(并编辑了)我的渲染循环。我正在寻找一个示例,说明如何在传入不同制服的单个渲染过程中多次重复使用我的像素着色器。
CAMetalLayer *metalLayer = [metal_info.g_iosMetalView getMetalLayer];
id <CAMetalDrawable> frameDrawable;
while (!frameDrawable){
frameDrawable = [metalLayer nextDrawable];
}
MTLRenderPassDescriptor *mtlRenderPassDescriptor;
mtlRenderPassDescriptor = [MTLRenderPassDescriptor new];
mtlRenderPassDescriptor.colorAttachments[0].texture = frameDrawable.texture;
mtlRenderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionLoad;
mtlRenderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 1.0, 1.0);
mtlRenderPassDescriptor.depthAttachment.texture = metal_info.g_depthTexture;
mtlRenderPassDescriptor.depthAttachment.loadAction = MTLLoadActionClear;
mtlRenderPassDescriptor.depthAttachment.storeAction = MTLStoreActionStore;
mtlRenderPassDescriptor.depthAttachment.clearDepth = 1.0;
// Create My one and only command buffer
id <MTLCommandBuffer> mtlCommandBuffer = [metal_info.g_commandQueue commandBuffer];
int n = RendererInfo.fact.GetActiveCount();
// loop through all the objects I have (I'm having trouble with 2)
Object* curObj = NULL;
for (int obj_i = 0 ; obj_i < n ; ++obj_i)
{
// create one render encoder for each object
id <MTLRenderCommandEncoder> renderCommand = [mtlCommandBuffer renderCommandEncoderWithDescriptor: mtlRenderPassDescriptor];
memcpy([metal_info.g_projectionMatrix contents], &metal_info.g_Projection, sizeof(Matrix4f));
Matrix4f *view = RendererInfo.cam->GetViewMatrix();
memcpy([metal_info.g_viewMatrix contents], view, sizeof(Matrix4f));
[renderCommand setFrontFacingWinding:MTLWindingCounterClockwise];
[renderCommand setCullMode:MTLCullModeBack];
[renderCommand setViewport: (MTLViewport){ 0.0, 0.0,
(double)metal_info.g_metal_width,
(double)metal_info.g_metal_height,
0.0, 1.0 }];
[renderCommand setRenderPipelineState:metal_info.g_pipelineState];
[renderCommand setDepthStencilState:metal_info.g_depthState];
curObj = RendererInfo.fact.GetObjectAtIndex(obj_i);
id<MTLBuffer> vertices = curObj->GetVertexBuffer();
id<MTLBuffer> indicies = curObj->GetIndexBuffer();
int indexCount = curObj->GetIndexCount();
id <MTLTexture> texture = objTexture->GetAsset();
[renderCommand setFragmentTexture:texture atIndex:0];
memcpy([metal_info.g_shaderUniformInfo contents], curObj->GetUniformInfo(), curObj->curObj->GetUniformInfoSize());
[renderCommand setVertexBuffer:vertices offset:0 atIndex:VERTICES__INDEX];
[renderCommand setVertexBuffer:metal_info.g_viewMatrix offset:0 atIndex:VIEW_MATRIX_BUFFER_INDEX];
[renderCommand setVertexBuffer:metal_info.g_projectionMatrix offset:0 atIndex:PROJECTION_MATRIX_BUFFER_INDEX];
[renderCommand setFragmentBuffer:metal_info.g_shaderUniformInfo offset:0 atIndex:UNIFORM_INFO_BUFFER_INDEX];
[renderCommand drawIndexedPrimitives:MTLPrimitiveTypeTriangle
indexCount:indexCount
indexType:MTLIndexTypeUInt32
indexBuffer:indicies
indexBufferOffset:0];
[renderCommand endEncoding];
}
[mtlCommandBuffer presentDrawable:frameDrawable];
[mtlCommandBuffer commit];
如果你愿意,我也可以发布像素着色器,但是当我编码为一次只渲染一个对象时,着色器可以正常工作。