void OGLMapping::Mapping(GLenum& primType, uint32_t& primCount, RenderLayout const & rl)
{
uint32_t const vertexCount = static_cast<uint32_t>(rl.UseIndices() ? rl.NumIndices() : rl.NumVertices());
primType = GL_POINTS;
primCount = vertexCount;
switch (rl.TopologyType())
{
case RenderLayout::TT_PointList:
primType = GL_POINTS;
primCount = vertexCount;
break;
case RenderLayout::TT_LineList:
primType = GL_LINES;
primCount = vertexCount / 2;
break;
case RenderLayout::TT_LineStrip:
primType = GL_LINE_STRIP;
primCount = vertexCount - 1;
break;
case RenderLayout::TT_TriangleList:
primType = GL_TRIANGLES;
primCount = vertexCount / 3;
break;
case RenderLayout::TT_TriangleStrip:
primType = GL_TRIANGLE_STRIP;
primCount = vertexCount - 2;
break;
default:
THR(errc::function_not_supported);
}
}
// 渲染
/////////////////////////////////////////////////////////////////////////////////
void OGLESRenderEngine::DoRender(RenderTechnique const & tech, RenderLayout const & rl)
{
uint32_t const num_instance = rl.NumInstances();
BOOST_ASSERT(num_instance != 0);
OGLESShaderObjectPtr cur_shader = checked_pointer_cast<OGLESShaderObject>(tech.Pass(0)->GetShaderObject());
checked_cast<OGLESRenderLayout const *>(&rl)->Active(cur_shader);
size_t const vertexCount = rl.UseIndices() ? rl.NumIndices() : rl.NumVertices();
GLenum mode;
uint32_t primCount;
OGLESMapping::Mapping(mode, primCount, rl);
numPrimitivesJustRendered_ += num_instance * primCount;
numVerticesJustRendered_ += num_instance * vertexCount;
GLenum index_type = GL_UNSIGNED_SHORT;
uint8_t* index_offset = nullptr;
if (rl.UseIndices())
{
if (EF_R16UI == rl.IndexStreamFormat())
{
index_type = GL_UNSIGNED_SHORT;
index_offset += rl.StartIndexLocation() * 2;
}
else
{
index_type = GL_UNSIGNED_INT;
index_offset += rl.StartIndexLocation() * 4;
}
}
uint32_t const num_passes = tech.NumPasses();
size_t const inst_format_size = rl.InstanceStreamFormat().size();
if (glloader_GLES_VERSION_3_0() && rl.InstanceStream())
{
OGLESGraphicsBuffer& stream(*checked_pointer_cast<OGLESGraphicsBuffer>(rl.InstanceStream()));
uint32_t const instance_size = rl.InstanceSize();
BOOST_ASSERT(num_instance * instance_size <= stream.Size());
uint8_t* elem_offset = nullptr;
for (size_t i = 0; i < inst_format_size; ++ i)
{
vertex_element const & vs_elem = rl.InstanceStreamFormat()[i];
GLint attr = cur_shader->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;
OGLESMapping::MappingVertexFormat(type, normalized, vs_elem.format);
normalized = (((VEU_Diffuse == vs_elem.usage) || (VEU_Specular == vs_elem.usage)) && !IsFloatFormat(vs_elem.format)) ? GL_TRUE : normalized;
GLvoid* offset = static_cast<GLvoid*>(elem_offset + rl.StartInstanceLocation() * instance_size);
stream.Active(false);
glVertexAttribPointer(attr, num_components, type, normalized, instance_size, offset);
glEnableVertexAttribArray(attr);
glVertexAttribDivisor(attr, 1);
}
elem_offset += vs_elem.element_size();
}
if (so_rl_)
{
glBeginTransformFeedback(so_primitive_mode_);
}
if (rl.UseIndices())
{
for (uint32_t i = 0; i < num_passes; ++ i)
{
RenderPassPtr const & pass = tech.Pass(i);
pass->Bind();
if (so_rl_)
{
OGLESShaderObjectPtr shader = checked_pointer_cast<OGLESShaderObject>(pass->GetShaderObject());
glTransformFeedbackVaryings(shader->GLSLProgram(), static_cast<GLsizei>(so_vars_ptrs_.size()), &so_vars_ptrs_[0], GL_SEPARATE_ATTRIBS);
for (uint32_t j = 0; j < so_buffs_.size(); ++ j)
{
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, j, so_buffs_[j]);
}
}
glDrawElementsInstanced(mode, static_cast<GLsizei>(rl.NumIndices()),
index_type, index_offset, num_instance);
pass->Unbind();
}
}
else
{
for (uint32_t i = 0; i < num_passes; ++ i)
{
RenderPassPtr const & pass = tech.Pass(i);
pass->Bind();
if (so_rl_)
{
OGLESShaderObjectPtr shader = checked_pointer_cast<OGLESShaderObject>(pass->GetShaderObject());
glTransformFeedbackVaryings(shader->GLSLProgram(), static_cast<GLsizei>(so_vars_ptrs_.size()), &so_vars_ptrs_[0], GL_SEPARATE_ATTRIBS); for (uint32_t j = 0; j < so_buffs_.size(); ++ j)
{
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, j, so_buffs_[j]);
}
}
glDrawArraysInstanced(mode, rl.StartVertexLocation(), static_cast<GLsizei>(rl.NumVertices()), num_instance);
pass->Unbind();
}
}
if (so_rl_)
{
glEndTransformFeedback();
}
for (size_t i = 0; i < inst_format_size; ++ i)
{
vertex_element const & vs_elem = rl.InstanceStreamFormat()[i];
GLint attr = cur_shader->GetAttribLocation(vs_elem.usage, vs_elem.usage_index);
if (attr != -1)
{
glDisableVertexAttribArray(attr);
glVertexAttribDivisor(attr, 0);
}
}
}
else
{
for (uint32_t instance = rl.StartInstanceLocation(); instance < rl.StartInstanceLocation() + num_instance; ++ instance)
{
if (rl.InstanceStream())
{
GraphicsBuffer& stream = *rl.InstanceStream();
uint32_t const instance_size = rl.InstanceSize();
BOOST_ASSERT(num_instance * instance_size <= stream.Size());
GraphicsBuffer::Mapper mapper(stream, BA_Read_Only);
uint8_t const * buffer = mapper.Pointer<uint8_t>();
uint32_t elem_offset = 0;
for (size_t i = 0; i < inst_format_size; ++ i)
{
BOOST_ASSERT(elem_offset < instance_size);
vertex_element const & vs_elem = rl.InstanceStreamFormat()[i];
GLint attr = cur_shader->GetAttribLocation(vs_elem.usage, vs_elem.usage_index);
if (attr != -1)
{
void const * addr = &buffer[instance * instance_size + elem_offset];
GLfloat const * float_addr = static_cast<GLfloat const *>(addr);
GLint const num_components = static_cast<GLint>(NumComponents(vs_elem.format));
GLenum type;
GLboolean normalized;
OGLESMapping::MappingVertexFormat(type, normalized, vs_elem.format);
normalized = (((VEU_Diffuse == vs_elem.usage) || (VEU_Specular == vs_elem.usage)) && !IsFloatFormat(vs_elem.format)) ? GL_TRUE : normalized;
switch (num_components)
{
case 1:
BOOST_ASSERT(IsFloatFormat(vs_elem.format));
glVertexAttrib1fv(attr, float_addr);
break;
case 2:
BOOST_ASSERT(IsFloatFormat(vs_elem.format));
glVertexAttrib2fv(attr, float_addr);
break;
case 3:
BOOST_ASSERT(IsFloatFormat(vs_elem.format));
glVertexAttrib3fv(attr, float_addr);
break;
case 4:
if (IsFloatFormat(vs_elem.format))
{
glVertexAttrib4fv(attr, float_addr);
}
else
{
GLubyte const * byte_addr = static_cast<GLubyte const *>(addr);
if (normalized)
{
glVertexAttrib4f(attr, byte_addr[0] / 255.0f, byte_addr[1] / 255.0f, byte_addr[2] / 255.0f, byte_addr[3] / 255.0f);
}
else
{
glVertexAttrib4f(attr, byte_addr[0], byte_addr[1], byte_addr[2], byte_addr[3]);
}
}
break;
default:
BOOST_ASSERT(false);
break;
}
}
elem_offset += vs_elem.element_size();
}
}
if (so_rl_)
{
glBeginTransformFeedback(so_primitive_mode_);
}
if (rl.UseIndices())
{
for (uint32_t i = 0; i < num_passes; ++ i)
{
RenderPassPtr const & pass = tech.Pass(i);
pass->Bind();
if (so_rl_)
{
OGLESShaderObjectPtr shader = checked_pointer_cast<OGLESShaderObject>(pass->GetShaderObject());
glTransformFeedbackVaryings(shader->GLSLProgram(), static_cast<GLsizei>(so_vars_ptrs_.size()), &so_vars_ptrs_[0], GL_SEPARATE_ATTRIBS);
for (uint32_t j = 0; j < so_buffs_.size(); ++ j)
{
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, j, so_buffs_[j]);
}
}
glDrawElements(mode, static_cast<GLsizei>(rl.NumIndices()),
index_type, index_offset);
pass->Unbind();
}
}
else
{
for (uint32_t i = 0; i < num_passes; ++ i)
{
RenderPassPtr const & pass = tech.Pass(i);
pass->Bind();
if (so_rl_)
{
OGLESShaderObjectPtr shader = checked_pointer_cast<OGLESShaderObject>(pass->GetShaderObject());
glTransformFeedbackVaryings(shader->GLSLProgram(), static_cast<GLsizei>(so_vars_ptrs_.size()), &so_vars_ptrs_[0], GL_SEPARATE_ATTRIBS);
for (uint32_t j = 0; j < so_buffs_.size(); ++ j)
{
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, j, so_buffs_[j]);
}
}
glDrawArrays(mode, rl.StartVertexLocation(), static_cast<GLsizei>(rl.NumVertices()));
pass->Unbind();
}
}
if (so_rl_)
{
glEndTransformFeedback();
}
}
}
checked_cast<OGLESRenderLayout const *>(&rl)->Deactive(cur_shader);
}