+void BezierRenderer::PrepareBezierGPUBuffer(const Objects& objects)
+{
+ m_bezier_coeffs.SetType(GraphicsBuffer::BufferTypeTexture);
+ m_bezier_coeffs.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
+ m_bezier_coeffs.Resize(objects.beziers.size()*sizeof(GPUBezierCoeffs));
+ BufferBuilder<GPUBezierCoeffs> builder(m_bezier_coeffs.Map(false, true, true), m_bezier_coeffs.GetSize());
+
+ for (auto bez : objects.beziers)
+ {
+ GPUBezierCoeffs coeffs = {
+ Float(bez.x0), Float(bez.y0),
+ Float(bez.x1 - bez.x0), Float(bez.y1 - bez.y0),
+ Float(bez.x2 - bez.x0), Float(bez.y2 - bez.y0)
+ };
+ builder.Add(coeffs);
+ }
+ m_bezier_coeffs.UnMap();
+ glGenTextures(1, &m_bezier_buffer_texture);
+ glBindTexture(GL_TEXTURE_BUFFER, m_bezier_buffer_texture);
+ glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32F, m_bezier_coeffs.GetHandle());
+
+ m_bezier_ids.SetType(GraphicsBuffer::BufferTypeTexture);
+ m_bezier_ids.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
+ m_bezier_ids.Upload(objects.data_indices.size() * sizeof(uint32_t), &objects.data_indices[0]);
+
+ glGenTextures(1, &m_bezier_id_buffer_texture);
+ glActiveTexture(GL_TEXTURE1);
+ glBindTexture(GL_TEXTURE_BUFFER, m_bezier_id_buffer_texture);
+ glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, m_bezier_ids.GetHandle());
+ glActiveTexture(GL_TEXTURE0);
+}
+
+void BezierRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
+{
+ if (!m_shader_program.Valid())
+ Warn("Shader is invalid (objects are of type %d)", m_type);
+
+ unsigned first_index = 0;
+ while (m_indexes[first_index] < first_obj_id*2) first_index += 2;
+ unsigned last_index = first_index;
+ while (m_indexes[last_index] < last_obj_id*2) last_index += 2;
+
+ m_shader_program.Use();
+ glUniform1i(m_shader_program.GetUniformLocation("bezier_buffer_texture"), 0);
+ glUniform1i(m_shader_program.GetUniformLocation("bezier_id_buffer_texture"), 1);
+ m_ibo.Bind();
+ glDrawElements(GL_LINES, (last_index-first_index)*2, GL_UNSIGNED_INT, (GLvoid*)(first_index*sizeof(uint32_t)));
+}
+