Render part of a document (incorrectly) on the GPU

[ipdf/code.git] / src / objectrenderer.cpp

diff --git a/src/objectrenderer.cpp b/src/objectrenderer.cpp
index ac25c4a..86b6430 100644 (file)
--- a/src/objectrenderer.cpp
+++ b/src/objectrenderer.cpp
@@ -29,13 +29,16 @@ ObjectRenderer::ObjectRenderer(const ObjectType & type,
 /**
  * Render using GPU
  */
-void ObjectRenderer::RenderUsingGPU()
+void ObjectRenderer::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();
        m_ibo.Bind();
-       glDrawElements(GL_LINES, m_indexes.size()*2, GL_UNSIGNED_INT, 0);
+       glDrawElements(GL_LINES, (last_index-first_index)*2, GL_UNSIGNED_INT, (GLvoid*)(first_index*sizeof(uint32_t)));
 }
 
 
@@ -288,15 +291,21 @@ void BezierRenderer::PrepareBezierGPUBuffer(const Objects& objects)
        glActiveTexture(GL_TEXTURE0);
 }
 
-void BezierRenderer::RenderUsingGPU()
+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, m_indexes.size()*2, GL_UNSIGNED_INT, 0);
+       glDrawElements(GL_LINES, (last_index-first_index)*2, GL_UNSIGNED_INT, (GLvoid*)(first_index*sizeof(uint32_t)));
 }
 
 /**