Hi everyone I’m having trouble using OpenGL and dynamic draw, i’m trying to write a code in order to renderer a perlin terrain and billboards however the more different object I have to draw the faster I have a memory issue (It take like 30 seconds to catch an exeption)… I think i’m doing the buffer initialisation and update badly.
I have 3 functions :
Init buffer :
//Vertex array buffer generation
glGenBuffers(1, &object.vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, object.vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, (object.nbBillboards)* 36 * sizeof(float), nullptr, GL_STREAM_DRAW);
//Index array buffer generation
glGenBuffers(1, &object.indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object.indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, object.nbBillboards * 6 * sizeof(int), nullptr, GL_STREAM_DRAW);
Update function :
//Vertex array buffer update
glBindBuffer(GL_ARRAY_BUFFER, object.vertexBuffer);// PRINT_OPENGL_ERROR();
glBufferSubData(GL_ARRAY_BUFFER,0, (object.nbBillboards) * 36 * sizeof(float), &object.vertexArray[0]);
//index array buffer update
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object.indexBuffer);
glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, object.nbBillboards * 6 * sizeof(int), &object.indexArray[0]);
And a draw
glDisable(GL_POLYGON_OFFSET_FILL);
glUseProgram(programId);
PRINT_OPENGL_ERROR();
//Buffer binding
glGenVertexArrays(1, &object.VAO);
glBindVertexArray(object.VAO);
glBindBuffer(GL_ARRAY_BUFFER, object.vertexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object.indexBuffer);
//Attrib pointers
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(float), nullptr);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(float), buffer_offset(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(float), buffer_offset(6 * sizeof(float)));
glEnableVertexAttribArray(2);
//Uniform
PRINT_OPENGL_ERROR();
float c[4]{ 0.0f,0.0f,0.0f,0.0f };
glUniform4fv(get_uni_loc(programId, "color"), 1, c);
GLuint text_id = glGetUniformLocation(programId, "texture");
glUniform1i(text_id, texture);
PRINT_OPENGL_ERROR();
//Draw
glDrawElements(GL_TRIANGLES, 6 * object.nbBillboards, GL_UNSIGNED_INT, nullptr);
I think that the draw function is causing the memory leak but i’m not an expert I learned OpenGl alone.
Do yu guys have a clue on what i’m doing wrong ?
Thank you in advance for your help.
Sorry for uploading my code like that but i’m struggling with that issue for many days… And sorry for my english 