Add offset to vertex shader

QTProject/subdivision.cpp

@@ -743,7 +743,8 @@ Subdivision::Result Subdivision::runShader(Input input, Tables &tables) {
     runEdgeShader(tables.edge_indices.size() / 4, input.vb_handle, edge_indices_handle, output_handle, edge_offset);
     int edgeTime = timer.elapsed();
     timer.restart();
-    runVertexShader(input.vertex_buffer.size(), input.vb_handle, vertex_indices_handle, vertex_offsets_handle, output_handle);
+    int vertex_offset = 0;
+    runVertexShader(input.vertex_buffer.size(), input.vb_handle, vertex_indices_handle, vertex_offsets_handle, output_handle, vertex_offset);
     int vertexTime = timer.elapsed();
 
     // Map the output buffer so we can read the results
@@ -793,13 +794,13 @@ void Subdivision::runCopyShader(GLuint size, GLuint vb_in, GLuint vb_out) {
     copyShader->release();
 }
 
-void Subdivision::runVertexShader(GLuint size, GLuint vb_handle, GLuint vertex_indices_handle, GLuint vertex_offsets_handle, GLuint output_handle) {
+void Subdivision::runVertexShader(GLuint size, GLuint vb_handle, GLuint vertex_indices_handle, GLuint vertex_offsets_handle, GLuint output_handle, GLuint offset) {
     vertexShader->bind();
 
     f->glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, vb_handle);
     f->glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, vertex_indices_handle);
     f->glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, vertex_offsets_handle);
-    f->glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, output_handle);
+    f->glBindBufferRange(GL_SHADER_STORAGE_BUFFER, 3, output_handle, offset * sizeof(Vertex), size * sizeof(Vertex));
 
     // Run the shader
     f->glDispatchCompute(size, 1, 1);

QTProject/subdivision.h

@@ -63,7 +63,7 @@ private:
     void findRegular(QVector<unsigned int> index_buffer, QVector<Vertex> vertex_buffer, QVector<unsigned int> &regular, QVector<unsigned int> &irregular);
     Result runShader(Input input, Tables &tables);
     void runCopyShader(GLuint size, GLuint vb_in, GLuint vb_out);
-    void runVertexShader(GLuint size, GLuint vb_handle, GLuint vertex_indices_handle, GLuint vertex_offsets_handle, GLuint output_handle);
+    void runVertexShader(GLuint size, GLuint vb_handle, GLuint vertex_indices_handle, GLuint vertex_offsets_handle, GLuint output_handle, GLuint offset);
     void runEdgeShader(GLuint size, GLuint vb_handle, GLuint edge_indices_handle, GLuint output_handle, GLuint offset);
 
     QVector<unsigned int> patchIBToTriangleIB(QVector<unsigned int> ib);