I'm trying to render a quad (two triangles) on screen with the vertex array buffer data of type GLint (typedef'd to an int32_t on my system) but the data I get in the vertex shader is as if the GLint had been cast to GLfloat.
The specific part of code where I provide the vertex data reads:
glGenVertexArrays(1, &g_quadVA);
glBindVertexArray(g_quadVA);
//Vertizes
glGenBuffers(1, &g_quadVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_quadVBO);
glBufferData(GL_ARRAY_BUFFER, 8 * sizeof(GLint), g_quad_vertex_buffer_data, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_INT, GL_FALSE, 0, NULL);
//Indizes
glGenBuffers(1, &g_quadIBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_quadIBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * sizeof(GLuint), g_quadindices, GL_STATIC_DRAW);
As you can see, I'm specifying the vertex array number 0 with type GL_INT (g_quad_vertex_buffer_data is an GLint array). In the Vertex Shader I'm also using
layout(location = 0) in ivec2 eingKnoten;
i.e. I define the vertex input as type ivec2. The data I get when reading eingKnoten.x in the VS isn't the integer I specify in the application though but rather bit for bit the value of (GLfloat)g_quad_vertex_buffer_data[#] i.e. a floating point number.
My question is: Am I missing something? Is glVertexAttribPointer(.., GL_INT, ..) and in ivec2 eingKnoten all that's needed to do when using integer vertex data?
I've attached a small test case that illustrates my question. It's a VS 2015 project where the main code is in Quelle1.cpp and the shaders are Shaders/test.{frag, vert}
On my system it renders a small, red rectangle.
My operatnig system is Windows 7 64bit, my card is an RX480 with the following driver:
Radeon Settings Version - 2019.0326.2353.42986
View Release Notes - https://www.amd.com/en/support/kb/release-notes/rn-rad-win-19-4-1
Driver Packaging Version - 18.50.31.01-190326a-340999C-RadeonSoftwareAdrenalin2019
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 8.1.1.1634
Direct3D® Version - 9.14.10.01377
OpenGL® Version - 25.20.15000.13547
OpenCL™ Version - 10.0.2766.5
AMD Audio Driver Version - 7.12.0.7728
Vulkan™ Driver Version - 2.0.78
Vulkan™ API Version - 1.1.101
