bool initBuffer()
{
// Generate a buffer object
glGenBuffers(buffer::MAX, &BufferName[0]);
// Allocate and copy buffers memory
std::vector<glm::byte> Data(PositionSizeF32 + PositionSizeI8 + PositionSizeI32 + PositionSizeRGB10A2 + PositionSizeF16 + PositionSizeRG11FB10F);
std::size_t CurrentOffset = 0;
memcpy(&Data[0] + CurrentOffset, PositionDataF32, PositionSizeF32);
CurrentOffset += PositionSizeF32;
memcpy(&Data[0] + CurrentOffset, PositionDataI8, PositionSizeI8);
CurrentOffset += PositionSizeI8;
memcpy(&Data[0] + CurrentOffset, PositionDataI32, PositionSizeI32);
CurrentOffset += PositionSizeI32;
memcpy(&Data[0] + CurrentOffset, PositionDataRGB10A2, PositionSizeRGB10A2);
CurrentOffset += PositionSizeRGB10A2;
memcpy(&Data[0] + CurrentOffset, PositionDataF16, PositionSizeF16);
CurrentOffset += PositionSizeF16;
memcpy(&Data[0] + CurrentOffset, PositionDataRG11FB10F, PositionSizeRG11FB10F);
glBindBuffer(GL_ARRAY_BUFFER, BufferName[buffer::VERTEX]);
glBufferStorage(GL_ARRAY_BUFFER, GLsizeiptr(Data.size()), &Data[0], 0);
GLint UniformBufferOffset(0);
glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &UniformBufferOffset);
GLint UniformBlockSize = glm::max(GLint(sizeof(glm::mat4)), UniformBufferOffset);
glBindBuffer(GL_UNIFORM_BUFFER, BufferName[buffer::TRANSFORM]);
glBufferStorage(GL_UNIFORM_BUFFER, UniformBlockSize, nullptr, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
return this->checkError("initBuffer");
}
ParameterRendererBuffer::ParameterRendererBuffer( ParameterCacheEntryStreamBuffers const& parameterCacheEntries, dp::gl::SharedBuffer const& ubo, GLenum target, size_t uboBinding, size_t uboOffset, GLsizeiptr uboBlockSize )
: m_parameters( parameterCacheEntries )
, m_ubo( ubo )
, m_target( target )
, m_uboBinding( GLint(uboBinding) )
, m_uboOffset( GLsizeiptr(uboOffset) )
, m_uboBlockSize( uboBlockSize )
{
DP_ASSERT( !m_parameters.empty() );
}
ParameterRendererBuffer::ParameterRendererBuffer(ParameterCacheEntryStreamBuffers const& parameterCacheEntries, dp::gl::BufferSharedPtr const& ubo, GLenum target
, size_t uboBinding, size_t uboOffset, GLsizeiptr uboBlockSize
, bool useUniformBufferUnifiedMemory)
: ParameterRendererStreamBuffer(parameterCacheEntries)
, m_ubo(ubo)
, m_target(target)
, m_uboBinding(GLint(uboBinding))
, m_uboOffset(GLsizeiptr(uboOffset))
, m_uboBlockSize(uboBlockSize)
, m_useUniformBufferUnifiedMemory(useUniformBufferUnifiedMemory)
{
}
// Buffer update using glBufferSubData
bool initBuffer()
{
// Generate a buffer object
glGenBuffers(1, &BufferName);
// Bind the buffer for use
glBindBuffer(GL_ARRAY_BUFFER, BufferName);
// Reserve buffer memory but don't copy the values
glBufferData(GL_ARRAY_BUFFER, GLsizeiptr(VertexCount * sizeof(glf::vertex_v4fc4f)), NULL, GL_STATIC_DRAW);
glf::vertex_v4fc4f* Data = (glf::vertex_v4fc4f*)glMapBufferRange(
GL_ARRAY_BUFFER,
0, // Offset
GLsizeiptr(VertexCount * sizeof(glf::vertex_v4fc4f)), // Size,
GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);
for(std::size_t i = 0; i < VertexCount; ++i)
{
//Data[i].Position = glm::vec4(glm::linearRand(glm::vec2(-1), glm::vec2(1)), glm::gaussRand(0.0f, 1.0f), 1);
//Data[i].Position = glm::vec4(glm::linearRand(glm::vec2(-1), glm::vec2(1)), /*glm::gaussRand(0.0f, 1.0f)*/0, 1);
//Data[i].Position = glm::vec4(glm::sphericalRand(1.0f), 1);
//Data[i].Position = glm::vec4(glm::gaussRand(glm::vec3(0), glm::vec3(1)), 1);
//Data[i].Position = glm::vec4(glm::circularRand(1.0f), 0, 1);
//Data[i].Position = glm::vec4(glm::diskRand(1.0f), 0, 1);
//Data[i].Position = glm::vec4(glm::ballRand(1.0f), 1);
Data[i].Position = glm::vec4(
glm::cos(static_cast<float>(i) / static_cast<float>(VertexCount) * glm::pi<float>() * 2.f) * 1.f,
glm::sin(static_cast<float>(i) / static_cast<float>(VertexCount) * glm::pi<float>() * 2.f) * 1.f,
0.0f, 1.0f);
Data[i].Color = glm::vec4(1);
}
glUnmapBuffer(GL_ARRAY_BUFFER);
// Unbind the buffer
glBindBuffer(GL_ARRAY_BUFFER, 0);
return this->checkError("initArrayBuffer");
}
/**
* @glsymbols
* @glfunref{FlushMappedNamedBufferRange}
*
* @pre Mapped()
*
* @throws Error
*/
void FlushRange(BufferSize offset, BufferSize length)
{
OGLPLUS_GLFUNC(FlushMappedNamedBufferRange)(
_name,
GLintptr(offset.Get()),
GLsizeiptr(length.Get())
);
OGLPLUS_CHECK(
FlushMappedNamedBufferRange,
ObjectError,
Object(BufferName(_name))
);
}
void
OpenGL::InitShapes()
{
if (!OpenGL::vertex_buffer_object)
return;
DeinitShapes();
assert(4096 % CIRCLE_SIZE == 0); // implies: assert(SIZE % 2 == 0)
GLshort *p = circle_data, *p2 = circle_data + CIRCLE_SIZE;
for (unsigned i = 0; i < CIRCLE_SIZE / 2; ++i) {
GLshort x = ISINETABLE[(i * (4096 / CIRCLE_SIZE) + 1024) & 0xfff];
GLshort y = ISINETABLE[i * (4096 / CIRCLE_SIZE)];
*p++ = x;
*p++ = y;
*p2++ = -x;
*p2++ = -y;
}
circle_buffer = new GLArrayBuffer();
circle_buffer->Load(GLsizeiptr(sizeof(circle_data)), circle_data);
p = small_circle_data;
p2 = circle_data;
for (unsigned i = 0; i < SMALL_CIRCLE_SIZE; ++i) {
*p++ = p2[0] >> 2;
*p++ = p2[1] >> 2;
p2 += 2 * CIRCLE_SIZE / SMALL_CIRCLE_SIZE;
}
small_circle_buffer = new GLArrayBuffer();
small_circle_buffer->Load(GLsizeiptr(sizeof(small_circle_data)),
small_circle_data);
}
ObjectOps& BufferRange(
GLuint index, BufferName buffer, BufferSize offset, BufferSize size) {
OGLPLUS_GLFUNC(TransformFeedbackBufferRange)
(_obj_name(),
index,
GetGLName(buffer),
GLintptr(offset.Get()),
GLsizeiptr(size.Get()));
OGLPLUS_CHECK(
TransformFeedbackBufferRange,
ObjectPairError,
Subject(buffer).Object(*this).Index(index));
return *this;
}
static GLsizeiptr _get_size(GLuint buf_name)
{
GLint value = 0;
OGLPLUS_GLFUNC(GetNamedBufferParameterivEXT)(
buf_name,
GL_BUFFER_SIZE,
&value
);
OGLPLUS_CHECK(
GetNamedBufferParameterivEXT,
ObjectError,
Object(BufferName(buf_name))
);
return GLsizeiptr(value);
}