was following the OpenGL RedBook and was able to use a Uniform for a frustrum or translate matrix. I have become a little lost trying to use both at the same time.
//Declarations
GLfloat frustum[4][4] = {
{((2.0*frusZNe //Etc...
GLfloat translate[4][4] = {
{1.0, 0.0, //Etc...
And then I use it in Init:
GLuint uboIndex;
GLint uboSize;
GLuint ubo;
GLvoid *buffer;
uboIndex = glGetUniformBlockIndex(program, "frustumUniform");
glGetActiveUniformBlockiv(program, uboIndex, GL_UNIFORM_BLOCK_DATA_SIZE, &uboSize);
buffer = malloc(uboSize);
const char* frustumName[1] = {"frustum"};
GLuint indices[1];
GLint size[1];
GLint offset[1];
GLint type[1];
glGetUniformIndices(program, 1, frustumName, indices);
glGetActiveUniformsiv(program, 1, indices, GL_UNIFORM_OFFSET, offset);
glGetActiveUniformsiv(program, 1, indices, GL_UNIFORM_SIZE, size);
glGetActiveUniformsiv(program, 1, indices, GL_UNIFORM_TYPE, type);
//memcpy(&buffer + 0, &frustum, sizeof(frustum));
glGenBuffers(1, &ubo);
glBindBuffer(GL_UNIFORM_BUFFER, ubo);
glBufferData(GL_UNIFORM_BUFFER, uboSize, &frustum, GL_STATIC_DRAW);
glBindBufferBase(GL_UNIFORM_BUFFER, uboIndex, ubo);
Immediately afterwards, I do the same thing for the translate one but change some of the values, such as: glGetUniformBlockIndex(program, "translateUniform");
///Translate Uniform, same 20 statements as above, with alterations
GLuint uboIndex2;
GLint uboSize2;
GLuint ubo2;
GLvoid *buffer2;
uboIndex2 = glGetUniformBlockIndex(program, "translateUniform");
glGetActiveUniformBlockiv(program, uboIndex2, GL_UNIFORM_BLOCK_DATA_SIZE, &uboSize2);
buffer2 = malloc(uboSize2);
string offsetString = iToS(uboIndex2);
debugMsg(offsetString + "Index2, 1:");
const char* translateName[1] = {"translate"};
GLuint indices2[1];
GLint size2[1];
GLint offset2[1];
GLint type2[1];
glGetUniformIndices(program, 1, translateName, indices2);
glGetActiveUniformsiv(program, 1, indices2, GL_UNIFORM_OFFSET, offset2);
glGetActiveUniformsiv(program, 1, indices2, GL_UNIFORM_SIZE, size2);
glGetActiveUniformsiv(program, 1, indices2, GL_UNIFORM_TYPE, type2);
//memcpy(&buffer + 0, &frustum, sizeof(frustum));
glGenBuffers(1, &ubo2);
glBindBuffer(GL_UNIFORM_BUFFER, ubo2);
glBufferData(GL_UNIFORM_BUFFER, uboSize2, &translate, GL_STATIC_DRAW);
glBindBufferBase(GL_UNIFORM_BUFFER, uboIndex2, ubo2);
string uboIndex2S = iToS(uboIndex2);
debugMsg("Index 2: " + uboIndex2S);
string uboSizeS, uboSizeS2, uboIndexS, uboIndexS2;
uboSizeS = iToS(uboSize);
uboSizeS2 = iToS(uboSize2);
uboIndexS = iToS(uboIndex);
uboIndexS2 = iToS(uboIndex2);
debugMsg(uboSizeS + " ," + uboSizeS2 + " ," + uboIndexS + " , " + uboIndexS2);
Vertex shader:
#version 430 core
uniform frustumUniform {
mat4 frustum;
};
uniform translateUniform {
mat4 translate;
};
layout(location = 0) in vec4 vPosition;
void
main()
{
vec3 trans = vec3(.2, 0, 0);
mat4 view = mat4(1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, -200.0, 1.0);
mat4 rotate = mat4(0.2, 0.0, 0.3, 0.0,
0.0, 1.0, 0.0, 0.0,
-0.3, 0.0, 0.2, 0.0,
0.0, 0.0, 20.0, 1.0);
mat4 translateOld = mat4(1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
gl_Position = frustum * translate * view * vPosition;
}
It compiles, but the second Uniform no longer works. Any ideas?