src code: LLVK_Beginning/renderer/multi_viewports/MultiViewPorts.cpp at main · gearslogy/LLVK_Beginning
Multiple windows overlapped
geom shader:
#version 460 core
#extension GL_ARB_viewport_array : enable
layout(constant_id = 0 ) const int VIEWPORTS_NUM = 2;
layout (triangles, invocations = 2) in;
layout (triangle_strip, max_vertices = 3) out;
layout (set=0, binding=0) uniform UBO{
mat4 proj[2];
mat4 modelView[2];
vec4 lightPos;
}ubo;
// 输入
layout(location=0) in INPUT{
vec3 N;
vec3 T;
vec2 uv0;
}gs_in[];
// 输出
layout(location=0) out OUTPUT{
vec3 out_N;
vec3 out_T;
vec2 out_uv0;
};
void main(){
for(int i=0; i <gl_in.length(); i++){
out_N = mat3(ubo.modelView[gl_InvocationID]) * gs_in[i].N;
out_T = mat3(ubo.modelView[gl_InvocationID]) * gs_in[i].T;
out_uv0 = gs_in[i].uv0;
// 变换position -> P * V * M * p
vec4 pos = gl_in[i].gl_Position;
vec4 worldPos = ubo.modelView[gl_InvocationID] * pos;
gl_Position = ubo.proj[gl_InvocationID] * worldPos;
// important! viewport
gl_ViewportIndex = gl_InvocationID;
gl_PrimitiveID = gl_PrimitiveIDIn;
EmitVertex();
}
EndPrimitive();
}
C++
// set viewports 0 = right(TOP), 1 = left(perspective)
VkViewport viewports[2]{};
VkRect2D scissors[2]{};
viewports[0] = FnCommand::viewport(width/2, height, width/2, 0); // right TOP view
viewports[1] = FnCommand::viewport(width/2, height, 0, 0); // left perspective view
scissors[0] = FnCommand::scissor(width/2, height, width/2, 0); // right TOP view
scissors[1] = FnCommand::scissor(width/2, height, 0, 0); // left perspective view
Link Copied
above is right result(test at RTX5070TI, same code)
