X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fobjectrenderer.cpp;h=8b3b7e4658d4afc5be4297021b1fcb8cd74aac3d;hp=9bbcfd66822deeb6d086ecd4b3579c28789dec0e;hb=7a83af96414ff156f56455ff7a5e7af01fc403b5;hpb=55790e6cc129dcac3b3d001c7f5c74c288642123;ds=sidebyside

diff --git a/src/objectrenderer.cpp b/src/objectrenderer.cpp
index 9bbcfd6..8b3b7e4 100644
--- a/src/objectrenderer.cpp
+++ b/src/objectrenderer.cpp
@@ -31,10 +31,14 @@ ObjectRenderer::ObjectRenderer(const ObjectType & type,
  */
 void ObjectRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
 {
+	// If we don't have anything to render, return.
+	if (first_obj_id == last_obj_id) return;
+	// If there are no objects of this type, return.
+	if (m_indexes.empty()) return;
 	unsigned first_index = 0;
-	while (m_indexes[first_index] < first_obj_id) first_index ++;
+	while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
 	unsigned last_index = first_index;
-	while (m_indexes[last_index] < last_obj_id) last_index ++;
+	while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
 
 	m_shader_program.Use();
 	m_ibo.Bind();
@@ -277,8 +281,8 @@ void BezierRenderer::PrepareBezierGPUBuffer(const Objects& objects)
 	{
 		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)
+			Float(bez->x1), Float(bez->y1),
+			Float(bez->x2), Float(bez->y2)
 			};
 		builder.Add(coeffs);
 	}
@@ -303,10 +307,15 @@ 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);
 
+	// If we don't have anything to render, return.
+	if (first_obj_id == last_obj_id) return;
+	// If there are no objects of this type, return.
+	if (m_indexes.empty()) return;
+
 	unsigned first_index = 0;
-	while (m_indexes[first_index] < first_obj_id) first_index ++;
+	while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
 	unsigned last_index = first_index;
-	while (m_indexes[last_index] < last_obj_id) last_index ++;
+	while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
 
 	m_shader_program.Use();
 	glUniform1i(m_shader_program.GetUniformLocation("bezier_buffer_texture"), 0);