VertexArrayObject() {
glCreateVertexArrays(1,&vertexArrayObject);
glCreateBuffers(3,buffer);
const static constexpr float data_0[]{
-0.5f,-0.5f,0.0f,1,
0.5f,-0.5f,0.0f,1,
0.0f, 0.0f,0.0f,1,
};
const static constexpr float data_1[]{
-0.5f,-0.5f,0.0f,1,
0.5f,-0.5f,0.0f,1,
0.0f, .25f,0.0f,1,
};
const static constexpr float data_2[]{
-0.5f,-0.5f,0.0f,1,
0.5f,-0.5f,0.0f,1,
0.0f, 0.5f,0.0f,1,
};
glNamedBufferData(buffer[0],sizeof(data_0),data_0,GL_STATIC_DRAW);
glNamedBufferData(buffer[1],sizeof(data_1),data_1,GL_STATIC_DRAW);
glNamedBufferData(buffer[2],sizeof(data_2),data_2,GL_STATIC_DRAW);
glVertexArrayVertexBuffer(vertexArrayObject,0,buffer[0],0,sizeof(float[4]));
glVertexArrayVertexBuffer(vertexArrayObject,1,buffer[1],0,sizeof(float[4]));
glVertexArrayVertexBuffer(vertexArrayObject,2,buffer[2],0,sizeof(float[4]));
glEnableVertexArrayAttrib(vertexArrayObject,0);
glVertexArrayAttribFormat(vertexArrayObject,0,4,GL_FLOAT,false,0);
glVertexArrayAttribBinding(vertexArrayObject,0,rand()%3);
}
void SetupModel(HWND hwnd)
{
RECT rect;
GetClientRect(hwnd, &rect);
// Vertex Buffer (position)
GLuint positionLocation = 0;
GLuint positionBindindex = 0;
glCreateBuffers(1, &positionBuffer);
glNamedBufferData(positionBuffer,
sizeof(positions), positions, GL_STATIC_DRAW);
// Vertex Buffer (uv)
GLuint uvLocation = 1;
GLuint uvBindindex = 1;
glCreateBuffers(1, &uvBuffer);
glNamedBufferData(uvBuffer,
sizeof(uvs), uvs, GL_STATIC_DRAW);
// Index Buffer
glCreateBuffers(1, &indexBuffer);
glNamedBufferData(indexBuffer,
sizeof(indices), indices, GL_STATIC_DRAW);
// Vertex Array
glCreateVertexArrays(1, &vertexArray);
glEnableVertexArrayAttrib(vertexArray, positionLocation);
glVertexArrayAttribFormat(vertexArray, positionLocation,
2, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vertexArray, positionLocation,
positionBindindex);
glVertexArrayVertexBuffer(vertexArray, positionBindindex,
positionBuffer, static_cast<GLintptr>(0), sizeof(GLfloat) * 2);
glEnableVertexArrayAttrib(vertexArray, uvLocation);
glVertexArrayAttribFormat(vertexArray, uvLocation,
2, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vertexArray, uvLocation,
uvBindindex);
glVertexArrayVertexBuffer(vertexArray, uvBindindex,
uvBuffer, static_cast<GLintptr>(0), sizeof(GLfloat) * 2);
glVertexArrayElementBuffer(vertexArray, indexBuffer);
}
void MainComponent::start() {
if (isRunning) {
return;
}
static const float vertices[] =
{
0.25, -0.25, 0.5, 1.0,
-0.25, -0.25, 0.5, 1.0,
0.25, 0.25, 0.5, 1.0
};
Shader shader = Shader();
glUseProgram(shader._program);
GLuint vbo;
glCreateBuffers(1, &vbo);
glCreateVertexArrays(1, &_vao);
glBindVertexArray(_vao);
glNamedBufferStorage(vbo, sizeof(vertices), vertices, 0);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexArrayVertexBuffer(_vao, 0, vbo, 0, 16);
glVertexArrayAttribFormat(_vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(_vao, 0, 0);
glEnableVertexArrayAttrib(_vao, 0);
glEnableVertexAttribArray(0);
run();
}
//??glVertexArrayVertexBuffer
//void glVertexArrayVertexBuffer(GLuint vaobj,
// GLuint bindingindex,
// GLuint buffer,
// GLintptr offset,
// GLsizei stride);
// 此函数用于解包 glBindVertexBuffer
void vertexArrayVertexBuffer(
GLuint bindingindex,
GLuint buffer,
GLintptr offset/*包的起始位置*/,
GLsizei stride/*包的大小*/
) {
glVertexArrayVertexBuffer(value_, bindingindex, buffer, offset, stride);
}
void startup()
{
rendering_program = compile_shaders();
GLuint buffer[2];
GLuint vao;
static const GLfloat positions[] = { 0.25f, -0.25f, 0.5f, 1.0f,
-0.25f, -0.25f, 0.5f, 1.0f,
0.25f, 0.25f, 0.5f, 1.0f };
static const GLfloat colors[] = { 1.0, 0.0, 0.0, 1.0,
1.0, 0.0, 0.0, 1.0,
1.0, 0.0, 0.0, 1.0 };
// Create the vertex array object.
glCreateVertexArrays(1, &vao);
// Create two buffers.
glCreateBuffers(2, &buffer[0]);
// Initialize the first buffer.
glNamedBufferStorage(buffer[0], sizeof(positions), positions, 0);
// Bind it to the vertex array - offset zero, stride = sizeof(vec4)
glVertexArrayVertexBuffer(vao, 0, buffer[0], 0, sizeof(vmath::vec4));
// Tell OpenGL what the format of the attribute is.
glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
// Tell OpenGL which vertex buffer binding to use for this attribute.
glVertexArrayAttribBinding(vao, 0, 0);
// Enable the attribute.
glEnableVertexArrayAttrib(vao, 0);
// Perform similar initialization for the second buffer.
glNamedBufferStorage(buffer[1], sizeof(colors), colors, 0);
glVertexArrayVertexBuffer(vao, 1, buffer[1], 0, sizeof(vmath::vec4));
glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vao, 1, 1);
glEnableVertexArrayAttrib(vao, 1);
glEnableVertexAttribArray(1);
glBindVertexArray(vao);
}
bool initVertexArray()
{
glCreateVertexArrays(1, &VertexArrayName);
glVertexArrayAttribBinding(VertexArrayName, semantic::attr::POSITION, 0);
glVertexArrayAttribFormat(VertexArrayName, semantic::attr::POSITION, 2, GL_FLOAT, GL_FALSE, 0);
glEnableVertexArrayAttrib(VertexArrayName, semantic::attr::POSITION);
glVertexArrayAttribBinding(VertexArrayName, semantic::attr::TEXCOORD, 0);
glVertexArrayAttribFormat(VertexArrayName, semantic::attr::TEXCOORD, 2, GL_FLOAT, GL_FALSE, sizeof(glm::vec2));
glEnableVertexArrayAttrib(VertexArrayName, semantic::attr::TEXCOORD);
glVertexArrayElementBuffer(VertexArrayName, BufferName[buffer::ELEMENT]);
glVertexArrayVertexBuffer(VertexArrayName, 0, BufferName[buffer::VERTEX], 0, sizeof(glf::vertex_v2fv2f));
return true;
}
bool SimpleUniformGL::InitScene()
{
glClearColor(bgColor.r, bgColor.g, bgColor.b, bgColor.a);
std::vector<GLuint> shaders;
shaders.push_back(GLUtil::CreateShader(GL_VERTEX_SHADER, "SimpleUniformVert.glsl"));
shaders.push_back(GLUtil::CreateShader(GL_FRAGMENT_SHADER, "SimpleUniformFrag.glsl"));
shaderProgram = GLUtil::CreateProgram(shaders);
for_each(shaders.begin(), shaders.end(), glDeleteShader);
glUseProgram(shaderProgram);
GLint overrideColor = glGetUniformLocation(shaderProgram, "overrideColor");
glProgramUniform4f(shaderProgram, overrideColor, 1.0f, 0.0f, 0.0f, 1.0f);
GLuint bindingPoint = 1;
float colorsBlock[8] = { 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0, 1.0f };
GLuint buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(colorsBlock), colorsBlock, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBufferBase(GL_UNIFORM_BUFFER, bindingPoint, buffer);
GLuint blockIndex = glGetUniformBlockIndex(shaderProgram, "ColorBlock");
glUniformBlockBinding(shaderProgram, blockIndex, bindingPoint);
glCreateVertexArrays(1, &vao);
glBindVertexArray(vao);
glCreateBuffers(1, &vbo);
glNamedBufferData(vbo, sizeof(Data::vertices), Data::vertices, GL_STATIC_DRAW);
glVertexArrayAttribBinding(vao, 0, 0);
glVertexArrayAttribBinding(vao, 1, 0);
glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(Vertex2));
glEnableVertexArrayAttrib(vao, 0);
glEnableVertexArrayAttrib(vao, 1);
glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex2().position));
return true;
}
__ThisData(){
glCreateVertexArrays(1,&vao);
glCreateBuffers(1,&buffer);
alignas(GLfloat) constexpr const static GLfloat data_[]{
0,0.5f,0,1,
-0.5f,-.5f,0,1,
0.5f,-.5f,0,1,
};
glNamedBufferData(buffer,sizeof(data_),data_,GL_STATIC_DRAW);
glEnableVertexArrayAttrib(vao,0);
glVertexArrayVertexBuffer(vao,0,buffer,0,sizeof(data_)/3);
glVertexArrayAttribBinding(vao,0,0);
glVertexArrayAttribFormat(vao,0,4,GL_FLOAT,false,0);
program = createProgram({
{GL_VERTEX_SHADER,readGLSLFile("glsl:SimpleVertexArrayObject.v.vert") },
{GL_FRAGMENT_SHADER,readGLSLFile("glsl:SimpleVertexArrayObject.f.frag")}
});
}
void rnd_util_init() {
glCreateVertexArrays(1, &cube_up_vao);
glCreateBuffers(1, &cube_up_vbo_verts);
glNamedBufferData(cube_up_vbo_verts, sizeof(cube_up_verts), cube_up_verts, GL_STATIC_DRAW);
glVertexArrayAttribBinding(cube_up_vao, 0, 0);
glVertexArrayVertexBuffer(cube_up_vao, 0, cube_up_vbo_verts, 0, 12);
glEnableVertexArrayAttrib(cube_up_vao, 0);
glVertexArrayAttribFormat(cube_up_vao, 0, 3, GL_FLOAT, GL_FALSE, 0);
/*
glCreateVertexArrays(1, &test_box_vao);
glCreateBuffers(1, &test_box_vbo_verts);
glNamedBufferData(test_box_vbo_verts, sizeof(test_box_verts), test_box_verts, GL_STATIC_DRAW);
glVertexArrayAttribBinding(test_box_vao, 0, 0);
glVertexArrayVertexBuffer(test_box_vao, 0, test_box_vbo_verts, 0, 108);
glEnableVertexArrayAttrib(test_box_vao, 0);
glVertexArrayAttribFormat(test_box_vao, 0, 3, GL_FLOAT, GL_FALSE, 0);
*/
}
GLuint VertexAssembly::createInputState(const VertexLayout& layout)
{
GLuint vertexArray;
glCreateVertexArrays(1, &vertexArray);
m_vertexArrays.push_back(vertexArray);
if (layout.indexBuffer != 0)
glVertexArrayElementBuffer(vertexArray, layout.indexBuffer);
for (const auto& vb : layout.vertexBuffers)
glVertexArrayVertexBuffer(vertexArray, vb.first,
vb.second.id, vb.second.offset, vb.second.stride);
for (const auto& attrib : layout.attributes)
{
glEnableVertexArrayAttrib(vertexArray, attrib.second.index);
glVertexArrayAttribBinding(vertexArray, attrib.second.index, attrib.first);
glVertexArrayAttribFormat(vertexArray, attrib.second.index, attrib.second.size,
GL_FLOAT, GL_FALSE, attrib.second.offset);
}
return vertexArray;
}
GLuint Mesh_Setup(GLuint shader_prog, struct Vertex *verts, GLuint num_verts)
{
GLuint vao;
glCreateVertexArrays(1, &vao);
GLuint pos_attrib_loc = glGetAttribLocation(shader_prog, "pos");
GLuint col_attrib_loc = glGetAttribLocation(shader_prog, "col");
glVertexArrayAttribFormat(vao, pos_attrib_loc, 3, GL_FLOAT, GL_FALSE, (GLuint)offsetof(struct Vertex, pos));
glVertexArrayAttribFormat(vao, col_attrib_loc, 4, GL_FLOAT, GL_FALSE, (GLuint)offsetof(struct Vertex, col));
glVertexArrayAttribBinding(vao, pos_attrib_loc, 0);
glVertexArrayAttribBinding(vao, col_attrib_loc, 0);
glEnableVertexArrayAttrib(vao, pos_attrib_loc);
glEnableVertexArrayAttrib(vao, col_attrib_loc);
GLuint vbo;
glCreateBuffers(1, &vbo);
glNamedBufferStorage(vbo, sizeof(struct Vertex) * num_verts, verts, 0);
glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(struct Vertex));
return vao;
}
void OGLRenderLayout::BindVertexStreams(ShaderObjectPtr const & so, GLuint vao) const
{
OGLShaderObjectPtr const & ogl_so = checked_pointer_cast<OGLShaderObject>(so);
RenderEngine& re = Context::Instance().RenderFactoryInstance().RenderEngineInstance();
uint32_t max_vertex_streams = re.DeviceCaps().max_vertex_streams;
std::vector<char> used_streams(max_vertex_streams, 0);
for (uint32_t i = 0; i < this->NumVertexStreams(); ++ i)
{
OGLGraphicsBuffer& stream(*checked_pointer_cast<OGLGraphicsBuffer>(this->GetVertexStream(i)));
uint32_t const size = this->VertexSize(i);
auto const & vertex_stream_fmt = this->VertexStreamFormat(i);
if (glloader_GL_VERSION_4_5() || glloader_GL_ARB_direct_state_access())
{
glVertexArrayVertexBuffer(vao, i, stream.GLvbo(), this->StartVertexLocation() * size, size);
}
uint32_t elem_offset = 0;
for (auto const & vs_elem : vertex_stream_fmt)
{
GLint attr = ogl_so->GetAttribLocation(vs_elem.usage, vs_elem.usage_index);
if (attr != -1)
{
GLintptr offset = elem_offset + this->StartVertexLocation() * size;
GLint const num_components = static_cast<GLint>(NumComponents(vs_elem.format));
GLenum type;
GLboolean normalized;
OGLMapping::MappingVertexFormat(type, normalized, vs_elem.format);
normalized = (((VEU_Diffuse == vs_elem.usage) || (VEU_Specular == vs_elem.usage)) && !IsFloatFormat(vs_elem.format)) ? GL_TRUE : normalized;
BOOST_ASSERT(GL_ARRAY_BUFFER == stream.GLType());
stream.Active(true);
if (glloader_GL_VERSION_4_5() || glloader_GL_ARB_direct_state_access())
{
glVertexArrayAttribFormat(vao, attr, num_components, type, normalized, elem_offset);
glVertexArrayAttribBinding(vao, attr, i);
glEnableVertexArrayAttrib(vao, attr);
}
else if (glloader_GL_EXT_direct_state_access())
{
glVertexArrayVertexAttribOffsetEXT(vao, stream.GLvbo(), attr, num_components, type,
normalized, size, offset);
glEnableVertexArrayAttribEXT(vao, attr);
}
else
{
glVertexAttribPointer(attr, num_components, type, normalized, size, reinterpret_cast<GLvoid*>(offset));
glEnableVertexAttribArray(attr);
}
used_streams[attr] = 1;
}
elem_offset += vs_elem.element_size();
}
}
if (this->InstanceStream())
{
OGLGraphicsBuffer& stream(*checked_pointer_cast<OGLGraphicsBuffer>(this->InstanceStream()));
uint32_t const instance_size = this->InstanceSize();
BOOST_ASSERT(this->NumInstances() * instance_size <= stream.Size());
if (glloader_GL_VERSION_4_5() || glloader_GL_ARB_direct_state_access())
{
glVertexArrayVertexBuffer(vao, this->NumVertexStreams(), stream.GLvbo(),
this->StartInstanceLocation() * instance_size, instance_size);
glVertexArrayBindingDivisor(vao, this->NumVertexStreams(), 1);
}
size_t const inst_format_size = this->InstanceStreamFormat().size();
uint32_t elem_offset = 0;
for (size_t i = 0; i < inst_format_size; ++ i)
{
VertexElement const & vs_elem = this->InstanceStreamFormat()[i];
GLint attr = ogl_so->GetAttribLocation(vs_elem.usage, vs_elem.usage_index);
if (attr != -1)
{
GLint const num_components = static_cast<GLint>(NumComponents(vs_elem.format));
GLenum type;
GLboolean normalized;
OGLMapping::MappingVertexFormat(type, normalized, vs_elem.format);
normalized = (((VEU_Diffuse == vs_elem.usage) || (VEU_Specular == vs_elem.usage)) && !IsFloatFormat(vs_elem.format)) ? GL_TRUE : normalized;
GLintptr offset = elem_offset + this->StartInstanceLocation() * instance_size;
BOOST_ASSERT(GL_ARRAY_BUFFER == stream.GLType());
stream.Active(true);
if (glloader_GL_VERSION_4_5() || glloader_GL_ARB_direct_state_access())
{
glVertexArrayAttribFormat(vao, attr, num_components, type, normalized, elem_offset);
glVertexArrayAttribBinding(vao, attr, this->NumVertexStreams());
glEnableVertexArrayAttrib(vao, attr);
}
else if (glloader_GL_EXT_direct_state_access())
{
glVertexArrayVertexAttribOffsetEXT(vao, stream.GLvbo(), attr, num_components, type,
normalized, instance_size, offset);
glEnableVertexArrayAttribEXT(vao, attr);
glVertexAttribDivisor(attr, 1);
}
else
{
glVertexAttribPointer(attr, num_components, type, normalized, instance_size,
reinterpret_cast<GLvoid*>(offset));
glEnableVertexAttribArray(attr);
glVertexAttribDivisor(attr, 1);
}
used_streams[attr] = 1;
}
elem_offset += vs_elem.element_size();
}
}
for (GLuint i = 0; i < max_vertex_streams; ++ i)
{
if (!used_streams[i])
{
if (glloader_GL_VERSION_4_5() || glloader_GL_ARB_direct_state_access())
{
glDisableVertexArrayAttrib(vao, i);
}
else if (glloader_GL_EXT_direct_state_access())
{
glDisableVertexArrayAttribEXT(vao, i);
}
else
{
glDisableVertexAttribArray(i);
}
}
}
}
void ImageViewerPanel::initializeGL()
{
//glewInit();
glGetIntegerv(GL_MAJOR_VERSION, &ogl_ver_major);
glGetIntegerv(GL_MINOR_VERSION, &ogl_ver_minor);
shaderP = make_unique<GLSLProgram>(
"resources/shaders/img_vs.glsl",
"resources/shaders/img_fs.glsl");
if (ogl_ver_major == 4 && ogl_ver_minor >= 5)
{
// DSA
// Create VAO
glCreateBuffers(1, &vbo);
glNamedBufferData(vbo, sizeof(frame), frame, GL_STATIC_DRAW);
// IBO
GLuint indices[] = { 0,1,2,2,3,0 };
glCreateBuffers(1, &ibo);
glNamedBufferData(ibo, sizeof(indices), indices, GL_STATIC_DRAW);
// VAO
glCreateVertexArrays(1, &vao);
glEnableVertexArrayAttrib(vao, 0);
// Setup the formats
glVertexArrayAttribFormat(vao, 0, 2, GL_FLOAT, GL_FALSE, 0);
glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(float) * 2);
glVertexArrayAttribBinding(vao, 0, 0);
glVertexArrayElementBuffer(vao, ibo);
// Setup textures
int texSize = 4;
glCreateTextures(GL_TEXTURE_2D, 1, &tex);
glTextureParameteri(tex, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(tex, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTextureParameteri(tex, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTextureParameteri(tex, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTextureStorage2D(tex, 1, GL_RGB32F, imgsize[0], imgsize[1]);
if (texLen > 0)
{
glTextureSubImage2D(tex, 0, 0, 0, imgsize[0], imgsize[1], GL_RGB, GL_FLOAT, textures);
}
texHandle = glGetTextureHandleARB(tex);
glMakeTextureHandleResidentARB(texHandle);
}
else
{
// Non-DSA
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
// Bind UV values
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(frame), frame, GL_STATIC_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
}
//[-------------------------------------------------------]
//[ Public methods ]
//[-------------------------------------------------------]
VertexArrayVaoDsa::VertexArrayVaoDsa(OpenGLRenderer &openGLRenderer, const Renderer::VertexAttributes& vertexAttributes, uint32_t numberOfVertexBuffers, const Renderer::VertexArrayVertexBuffer *vertexBuffers, IndexBuffer *indexBuffer) :
VertexArrayVao(openGLRenderer, numberOfVertexBuffers, vertexBuffers, indexBuffer)
{
// Vertex buffer reference handling is done within the base class "VertexArrayVao"
const bool isARB_DSA = openGLRenderer.getExtensions().isGL_ARB_direct_state_access();
if (isARB_DSA)
{
// Create the OpenGL vertex array
glCreateVertexArrays(1, &mOpenGLVertexArray);
}
else
{
// Create the OpenGL vertex array
glGenVertexArrays(1, &mOpenGLVertexArray);
}
// Loop through all attributes
// -> We're using "glBindAttribLocationARB()" when linking the program so we have known attribute locations (the vertex array can't know about the program)
GLuint attributeLocation = 0;
const Renderer::VertexAttribute *attributeEnd = vertexAttributes.attributes + vertexAttributes.numberOfAttributes;
for (const Renderer::VertexAttribute *attribute = vertexAttributes.attributes; attribute < attributeEnd; ++attribute, ++attributeLocation)
{
// Set the OpenGL vertex attribute pointer
// TODO(co) Add security check: Is the given resource one of the currently used renderer?
const Renderer::VertexArrayVertexBuffer& vertexArrayVertexBuffer = vertexBuffers[attribute->inputSlot];
if (isARB_DSA)
{
// Enable attribute
glEnableVertexArrayAttrib(mOpenGLVertexArray, attributeLocation);
// Set up the format for my attribute
glVertexArrayAttribFormat(mOpenGLVertexArray, attributeLocation, Mapping::getOpenGLSize(attribute->vertexAttributeFormat), Mapping::getOpenGLType(attribute->vertexAttributeFormat), static_cast<GLboolean>(Mapping::isOpenGLVertexAttributeFormatNormalized(attribute->vertexAttributeFormat)), static_cast<GLuint>(attribute->alignedByteOffset));
// Bind vertex buffer to buffer point
glVertexArrayVertexBuffer(mOpenGLVertexArray,
attributeLocation,
static_cast<VertexBuffer*>(vertexArrayVertexBuffer.vertexBuffer)->getOpenGLArrayBuffer(),
0, // No offset to the first element of the buffer
static_cast<GLsizei>(vertexArrayVertexBuffer.strideInBytes));
// Per-instance instead of per-vertex requires "GL_ARB_instanced_arrays"
if (attribute->instancesPerElement > 0 && openGLRenderer.getExtensions().isGL_ARB_instanced_arrays())
{
glVertexArrayBindingDivisor(mOpenGLVertexArray, attributeLocation, attribute->instancesPerElement);
}
}
else
{
glVertexArrayVertexAttribOffsetEXT(mOpenGLVertexArray,
static_cast<VertexBuffer*>(vertexArrayVertexBuffer.vertexBuffer)->getOpenGLArrayBuffer(),
attributeLocation, Mapping::getOpenGLSize(attribute->vertexAttributeFormat),
Mapping::getOpenGLType(attribute->vertexAttributeFormat),
static_cast<GLboolean>(Mapping::isOpenGLVertexAttributeFormatNormalized(attribute->vertexAttributeFormat)),
static_cast<GLsizei>(vertexArrayVertexBuffer.strideInBytes),
static_cast<GLintptr>(attribute->alignedByteOffset));
// Per-instance instead of per-vertex requires "GL_ARB_instanced_arrays"
if (attribute->instancesPerElement > 0 && openGLRenderer.getExtensions().isGL_ARB_instanced_arrays())
{
// Sadly, DSA has no support for "GL_ARB_instanced_arrays", so, we have to use the bind way
// -> Keep the bind-horror as local as possible
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Backup the currently bound OpenGL vertex array
GLint openGLVertexArrayBackup = 0;
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &openGLVertexArrayBackup);
#endif
// Bind this OpenGL vertex array
glBindVertexArray(mOpenGLVertexArray);
// Set divisor
glVertexAttribDivisorARB(attributeLocation, attribute->instancesPerElement);
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Be polite and restore the previous bound OpenGL vertex array
glBindVertexArray(static_cast<GLuint>(openGLVertexArrayBackup));
#endif
}
// Enable OpenGL vertex attribute array
glEnableVertexArrayAttribEXT(mOpenGLVertexArray, attributeLocation);
}
}
// Check the used index buffer
// -> In case of no index buffer we don't bind buffer 0, there's not really a point in it
if (nullptr != indexBuffer)
{
if (isARB_DSA)
{
// Bind the index buffer
glVertexArrayElementBuffer(mOpenGLVertexArray, indexBuffer->getOpenGLElementArrayBuffer());
}
else
{
// Sadly, EXT DSA has no support for element array buffer, so, we have to use the bind way
// -> Keep the bind-horror as local as possible
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Backup the currently bound OpenGL vertex array
GLint openGLVertexArrayBackup = 0;
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &openGLVertexArrayBackup);
// Backup the currently bound OpenGL element array buffer
GLint openGLElementArrayBufferBackup = 0;
glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB, &openGLElementArrayBufferBackup);
#endif
// Bind this OpenGL vertex array
glBindVertexArray(mOpenGLVertexArray);
// Bind OpenGL element array buffer
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, indexBuffer->getOpenGLElementArrayBuffer());
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Be polite and restore the previous bound OpenGL vertex array
glBindVertexArray(static_cast<GLuint>(openGLVertexArrayBackup));
// Be polite and restore the previous bound OpenGL element array buffer
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, static_cast<GLuint>(openGLElementArrayBufferBackup));
#endif
}
}
}
void MainWindow::setObjectFileFormat(const QString & fileName) {
auto off_=ObjectFileFormatNormalReader::read(fileName);
if (off_) {
glDeleteBuffers(1,&(thisData->vao_index));
glDeleteBuffers(1,&(thisData->vao_buffer));
glDeleteVertexArrays(1,&(thisData->vao));
glCreateBuffers(1,&(thisData->vao_index));
glCreateBuffers(1,&(thisData->vao_buffer));
glCreateVertexArrays(1,&(thisData->vao));
glNamedBufferData(
thisData->vao_buffer,
off_->points.size()*sizeof(off_->points[0]),
off_->points.data(),
GL_STATIC_DRAW
);
glNamedBufferData(
thisData->vao_index,
off_->faces.size()*sizeof(off_->faces[0]),
off_->faces.data(),
GL_STATIC_DRAW
);
typedef std::remove_reference_t<decltype(off_->points[0])> AttribType;
/*0 position*/
glEnableVertexArrayAttrib(thisData->vao,0);
glVertexArrayVertexBuffer(thisData->vao,0,thisData->vao_buffer,0,sizeof(AttribType) );
glVertexArrayAttribBinding(thisData->vao,0,0);
glVertexArrayAttribFormat(thisData->vao,0,3,GL_FLOAT,false, offsetof(AttribType,point));
/*1 normal*/
glEnableVertexArrayAttrib(thisData->vao,1);
glVertexArrayVertexBuffer(thisData->vao,1,thisData->vao_buffer,0,sizeof(AttribType) );
glVertexArrayAttribBinding(thisData->vao,1,1);
glVertexArrayAttribFormat(thisData->vao,1,3,GL_FLOAT,false, offsetof(AttribType,normal) );
/*set the index buffer*/
glVertexArrayElementBuffer(thisData->vao,thisData->vao_index);
thisData->elements_size=off_->faces.size()*3;
/*reset mvp*/
const auto left_right=off_->xMax-off_->xMin;
const auto up_down=off_->yMax-off_->yMin;
const auto near_far=off_->zMax-off_->zMin;
auto max_outer_=std::max({ left_right,up_down,near_far });
max_outer_=1.65f/max_outer_;
const auto scale_ =glm::scale(glm::mat4(),
glm::vec3(max_outer_,max_outer_,max_outer_)
);
const auto translate_=glm::translate(glm::mat4(),
glm::vec3(
-(off_->xMax+off_->xMin)/2,
-(off_->yMax+off_->yMin)/2,
-(off_->zMax+off_->zMin)/2)
);
thisData->mvp= scale_ * translate_ ;
thisData->normal_mvp= glm::transpose( glm::inverse( scale_ ) ) ;
/*redraw*/
updateGL();
}
else {
qDebug().noquote()<<("read"+fileName+"object file format error!");
}
}
int main(int /*argc*/, char ** /*argv*/) {
BaseApp app;
ProgramObject programEnv, program;
auto mainWindow = app.getMainWindow();
PerspectiveCamera cam;
OrbitManipulator manipulator(&cam);
manipulator.setupCallbacks(app);
manipulator.setZoom(3);
GLuint diffuseTexture;
GLuint specularTexture;
GLuint vao;
GLuint vaoEmpty;
GLuint vbo;
int32_t sphereSizeX = 20;
int32_t sphereSizeY = 20;
app.addInitCallback([&]() {
std::string prefix = app.getResourceDir() + "Shaders/Tutorial/";
auto vs = compileShader(GL_VERTEX_SHADER,
"#version 450\n",
Loader::text(prefix + "uv.vp"));
auto fs = compileShader(GL_FRAGMENT_SHADER,
"#version 450\n",
Loader::text(prefix + "lighting.vp"),
Loader::text(prefix + "uv.fp"));
program = createProgram(vs, fs);
std::string texPrefix = app.getResourceDir() + "Textures/Tutorial/";
diffuseTexture = Loader::texture(texPrefix + "earth.png");
specularTexture = Loader::texture(texPrefix + "earth_s.png");
glCreateBuffers(1, &vbo);
const uint32_t floatsPerVertex = 6;
const uint32_t vertiesPerFace = 6;
float*vertices = new float[sphereSizeX*sphereSizeY*vertiesPerFace*floatsPerVertex];
for (int32_t y = 0; y<sphereSizeY; ++y) {
for (int32_t x = 0; x<sphereSizeX; ++x) {
for (uint32_t k = 0; k<vertiesPerFace; ++k) {
const int32_t xOffset[] = { 0,1,0,0,1,1 };
const int32_t yOffset[] = { 0,0,1,1,0,1 };
float u = (float)(x + xOffset[k]) / sphereSizeX;
float v = (float)(y + yOffset[k]) / sphereSizeY;
float xAngle = -u*glm::two_pi<float>();
float yAngle = v*glm::pi<float>();
uint32_t faceId = y*sphereSizeX + x;
uint32_t faceVertex = faceId*vertiesPerFace + k;
vertices[faceVertex*floatsPerVertex + 0] = glm::cos(xAngle)*glm::sin(yAngle);
vertices[faceVertex*floatsPerVertex + 1] = -glm::cos(yAngle);
vertices[faceVertex*floatsPerVertex + 2] = glm::sin(xAngle)*glm::sin(yAngle);
vertices[faceVertex*floatsPerVertex + 3] = 1;
vertices[faceVertex*floatsPerVertex + 4] = u;
vertices[faceVertex*floatsPerVertex + 5] = v;
}
}
}
glNamedBufferData(vbo, sizeof(float)*sphereSizeX*sphereSizeY*vertiesPerFace*floatsPerVertex, vertices, GL_STATIC_DRAW);
delete[]vertices;
glCreateVertexArrays(1, &vao);
glEnableVertexArrayAttrib(vao, 0);
glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, 0, 0);
glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(float)*floatsPerVertex);
glEnableVertexArrayAttrib(vao, 1);
glVertexArrayAttribFormat(vao, 1, 2, GL_FLOAT, 0, 0);
glVertexArrayVertexBuffer(vao, 1, vbo, sizeof(float) * 4, sizeof(float)*floatsPerVertex);
glClearColor(0, 0, 0, 1);
glDisable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
});
app.addResizeCallback([&](int w, int h) {
glViewport(0, 0, w, h);
cam.setAspect(float(w) / float(h));
});
app.addDrawCallback([&]() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
program.use();
glBindTextureUnit(0, diffuseTexture);
glBindTextureUnit(1, specularTexture);
program.setMatrix4fv("p", value_ptr(cam.getProjection()));
program.setMatrix4fv("v", value_ptr(cam.getView()));
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, sphereSizeX*sphereSizeY * 6);
glBindVertexArray(0);
});
return app.run();
}