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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the implementation of the VertexBufferGL, IndexBufferGL
// and VertexStructGL classes, as well as the geometry-related GAPI functions.
#include "command_buffer/service/cross/gl/gapi_gl.h"
#include "command_buffer/service/cross/gl/geometry_gl.h"
namespace o3d {
namespace command_buffer {
VertexBufferGL::~VertexBufferGL() {
glDeleteBuffers(1, &gl_buffer_);
CHECK_GL_ERROR();
}
// Creates the GL buffer object.
void VertexBufferGL::Create() {
glGenBuffers(1, &gl_buffer_);
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_);
GLenum usage =
(flags() & vertex_buffer::kDynamic) ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW;
glBufferData(GL_ARRAY_BUFFER, size(), NULL, usage);
CHECK_GL_ERROR();
}
// Sets the data into the GL buffer object.
bool VertexBufferGL::SetData(unsigned int offset,
unsigned int size,
const void *data) {
if (!gl_buffer_) {
LOG(ERROR) << "Calling SetData on a non-initialized VertexBufferGL.";
return false;
}
if ((offset >= this->size()) || (offset + size > this->size())) {
LOG(ERROR) << "Invalid size or offset on VertexBufferGL::SetData.";
return false;
}
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_);
glBufferSubData(GL_ARRAY_BUFFER, offset, size, data);
CHECK_GL_ERROR();
return true;
}
// Gets the data from the GL buffer object.
bool VertexBufferGL::GetData(unsigned int offset,
unsigned int size,
void *data) {
if (!gl_buffer_) {
LOG(ERROR) << "Calling GetData on a non-initialized VertexBufferGL.";
return false;
}
if ((offset >= this->size()) || (offset + size > this->size())) {
LOG(ERROR) << "Invalid size or offset on VertexBufferGL::GetData.";
return false;
}
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_);
glGetBufferSubData(GL_ARRAY_BUFFER, offset, size, data);
CHECK_GL_ERROR();
return true;
}
IndexBufferGL::~IndexBufferGL() {
glDeleteBuffers(1, &gl_buffer_);
}
// Creates the GL buffer object.
void IndexBufferGL::Create() {
glGenBuffers(1, &gl_buffer_);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gl_buffer_);
GLenum usage =
(flags() & vertex_buffer::kDynamic) ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW;
glBufferData(GL_ELEMENT_ARRAY_BUFFER, size(), NULL, usage);
CHECK_GL_ERROR();
}
// Sets the data into the GL buffer object.
bool IndexBufferGL::SetData(unsigned int offset,
unsigned int size,
const void *data) {
if (!gl_buffer_) {
LOG(ERROR) << "Calling SetData on a non-initialized IndexBufferGL.";
return false;
}
if ((offset >= this->size()) || (offset + size > this->size())) {
LOG(ERROR) << "Invalid size or offset on IndexBufferGL::SetData.";
return false;
}
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gl_buffer_);
glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, data);
CHECK_GL_ERROR();
return true;
}
// Gets the data from the GL buffer object.
bool IndexBufferGL::GetData(unsigned int offset,
unsigned int size,
void *data) {
if (!gl_buffer_) {
LOG(ERROR) << "Calling GetData on a non-initialized IndexBufferGL.";
return false;
}
if ((offset >= this->size()) || (offset + size > this->size())) {
LOG(ERROR) << "Invalid size or offset on IndexBufferGL::GetData.";
return false;
}
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gl_buffer_);
glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, data);
CHECK_GL_ERROR();
return true;
}
// Sets the input element in the VertexStruct resource.
void VertexStructGL::SetInput(unsigned int input_index,
ResourceId vertex_buffer_id,
unsigned int offset,
unsigned int stride,
vertex_struct::Type type,
vertex_struct::Semantic semantic,
unsigned int semantic_index) {
Element &element = GetElement(input_index);
element.vertex_buffer = vertex_buffer_id;
element.offset = offset;
element.stride = stride;
element.type = type;
element.semantic = semantic;
element.semantic_index = semantic_index;
dirty_ = true;
}
namespace {
inline ptrdiff_t OffsetToPtrDiff(unsigned int offset) {
return static_cast<ptrdiff_t>(offset);
}
inline void* OffsetToPtr(ptrdiff_t offset) {
return reinterpret_cast<void*>(offset);
}
} // anonymous namespace
unsigned int VertexStructGL::SetStreams(GAPIGL *gapi) {
if (dirty_) Compile();
unsigned int max_vertices = UINT_MAX;
for (unsigned int i = 0; i < kMaxAttribs; ++i) {
const AttribDesc &attrib = attribs_[i];
if (attrib.vertex_buffer_id == kInvalidResource) {
if (i == 0) {
glDisableClientState(GL_VERTEX_ARRAY);
} else {
glDisableVertexAttribArray(i);
}
} else {
glEnableVertexAttribArray(i);
VertexBufferGL *vertex_buffer =
gapi->GetVertexBuffer(attrib.vertex_buffer_id);
if (!vertex_buffer) {
glDisableVertexAttribArray(i);
max_vertices = 0;
continue;
}
DCHECK_NE(vertex_buffer->gl_buffer(), 0);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer->gl_buffer());
glVertexAttribPointer(i, attrib.size, attrib.type, attrib.normalized,
attrib.stride,
OffsetToPtr(attrib.offset));
max_vertices = std::min(max_vertices,
vertex_buffer->size() / attrib.stride);
}
}
CHECK_GL_ERROR();
return max_vertices;
}
namespace {
// from the ARB_vertex_program extension, at
// http://www.opengl.org/registry/specs/ARB/vertex_program.txt
//
// Generic
// Attribute Conventional Attribute Conventional Attribute Command
// --------- ------------------------ ------------------------------
// 0 vertex position Vertex
// 1 vertex weights 0-3 WeightARB, VertexWeightEXT
// 2 normal Normal
// 3 primary color Color
// 4 secondary color SecondaryColorEXT
// 5 fog coordinate FogCoordEXT
// 6 - -
// 7 - -
// 8 texture coordinate set 0 MultiTexCoord(TEXTURE0, ...)
// 9 texture coordinate set 1 MultiTexCoord(TEXTURE1, ...)
// 10 texture coordinate set 2 MultiTexCoord(TEXTURE2, ...)
// 11 texture coordinate set 3 MultiTexCoord(TEXTURE3, ...)
// 12 texture coordinate set 4 MultiTexCoord(TEXTURE4, ...)
// 13 texture coordinate set 5 MultiTexCoord(TEXTURE5, ...)
// 14 texture coordinate set 6 MultiTexCoord(TEXTURE6, ...)
// 15 texture coordinate set 7 MultiTexCoord(TEXTURE7, ...)
// 8+n texture coordinate set n MultiTexCoord(TEXTURE0+n, ...)
//
// Note: we only accept at most 8 texture coordinates for maximum compatibility
// with DirectX.
inline unsigned int GetAttribIndex(vertex_struct::Semantic semantic,
unsigned int semantic_index) {
switch (semantic) {
case vertex_struct::kPosition:
DCHECK_EQ(semantic_index, 0);
return 0;
case vertex_struct::kNormal:
DCHECK_EQ(semantic_index, 0);
return 2;
case vertex_struct::kColor:
DCHECK_LT(semantic_index, 2U);
return 3 + semantic_index;
case vertex_struct::kTexCoord:
DCHECK_LT(semantic_index, 8U);
return 8 + semantic_index;
default:
DLOG(FATAL) << "Not reached.";
return 0;
}
}
inline void ExtractSizeTypeNormalized(vertex_struct::Type type,
GLint *size,
GLenum *gl_type,
GLboolean *normalized) {
switch (type) {
case vertex_struct::kFloat1:
case vertex_struct::kFloat2:
case vertex_struct::kFloat3:
case vertex_struct::kFloat4:
*size = type - vertex_struct::kFloat1 + 1;
*gl_type = GL_FLOAT;
*normalized = false;
break;
case vertex_struct::kUChar4N:
*size = 4;
*gl_type = GL_UNSIGNED_BYTE;
*normalized = true;
break;
default:
DLOG(FATAL) << "Not reached.";
break;
}
}
} // anonymous namespace
#ifndef COMPILER_MSVC
// Although required by the spec, this causes problems on MSVC. It is needed by
// GCC.
const unsigned int VertexStructGL::kMaxAttribs;
#endif
void VertexStructGL::Compile() {
DCHECK(dirty_);
for (unsigned int i = 0; i < kMaxAttribs; ++i) {
attribs_[i].vertex_buffer_id = kInvalidResource;
}
for (unsigned int i = 0; i < count_ ; ++i) {
const Element &element = GetElement(i);
unsigned int index = GetAttribIndex(element.semantic,
element.semantic_index);
DCHECK_LT(index, kMaxAttribs);
AttribDesc &attrib = attribs_[index];
attrib.vertex_buffer_id = element.vertex_buffer;
ExtractSizeTypeNormalized(element.type, &attrib.size, &attrib.type,
&attrib.normalized);
attrib.stride = element.stride;
attrib.offset = OffsetToPtrDiff(element.offset);
}
dirty_ = false;
}
BufferSyncInterface::ParseError GAPIGL::CreateVertexBuffer(ResourceId id,
unsigned int size,
unsigned int flags) {
VertexBufferGL *vertex_buffer = new VertexBufferGL(size, flags);
vertex_buffer->Create();
vertex_buffers_.Assign(id, vertex_buffer);
return BufferSyncInterface::kParseNoError;
}
BufferSyncInterface::ParseError GAPIGL::DestroyVertexBuffer(ResourceId id) {
return vertex_buffers_.Destroy(id) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::SetVertexBufferData(ResourceId id,
unsigned int offset,
unsigned int size,
const void *data) {
VertexBufferGL *vertex_buffer = vertex_buffers_.Get(id);
if (!vertex_buffer) return BufferSyncInterface::kParseInvalidArguments;
return vertex_buffer->SetData(offset, size, data) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::GetVertexBufferData(ResourceId id,
unsigned int offset,
unsigned int size,
void *data) {
VertexBufferGL *vertex_buffer = vertex_buffers_.Get(id);
if (!vertex_buffer) return BufferSyncInterface::kParseInvalidArguments;
return vertex_buffer->GetData(offset, size, data) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::CreateIndexBuffer(ResourceId id,
unsigned int size,
unsigned int flags) {
IndexBufferGL *index_buffer = new IndexBufferGL(size, flags);
index_buffer->Create();
index_buffers_.Assign(id, index_buffer);
return BufferSyncInterface::kParseNoError;
}
BufferSyncInterface::ParseError GAPIGL::DestroyIndexBuffer(ResourceId id) {
return index_buffers_.Destroy(id) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::SetIndexBufferData(ResourceId id,
unsigned int offset,
unsigned int size,
const void *data) {
IndexBufferGL *index_buffer = index_buffers_.Get(id);
if (!index_buffer) return BufferSyncInterface::kParseInvalidArguments;
return index_buffer->SetData(offset, size, data) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::GetIndexBufferData(ResourceId id,
unsigned int offset,
unsigned int size,
void *data) {
IndexBufferGL *index_buffer = index_buffers_.Get(id);
if (!index_buffer) return BufferSyncInterface::kParseInvalidArguments;
return index_buffer->GetData(offset, size, data) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::CreateVertexStruct(
ResourceId id,
unsigned int input_count) {
if (id == current_vertex_struct_) validate_streams_ = true;
VertexStructGL *vertex_struct = new VertexStructGL(input_count);
vertex_structs_.Assign(id, vertex_struct);
return BufferSyncInterface::kParseNoError;
}
BufferSyncInterface::ParseError GAPIGL::DestroyVertexStruct(ResourceId id) {
if (id == current_vertex_struct_) validate_streams_ = true;
return vertex_structs_.Destroy(id) ?
BufferSyncInterface::kParseNoError :
BufferSyncInterface::kParseInvalidArguments;
}
BufferSyncInterface::ParseError GAPIGL::SetVertexInput(
ResourceId vertex_struct_id,
unsigned int input_index,
ResourceId vertex_buffer_id,
unsigned int offset,
unsigned int stride,
vertex_struct::Type type,
vertex_struct::Semantic semantic,
unsigned int semantic_index) {
switch (semantic) {
case vertex_struct::kPosition:
if (semantic_index != 0) {
return BufferSyncInterface::kParseInvalidArguments;
}
break;
case vertex_struct::kNormal:
if (semantic_index != 0) {
return BufferSyncInterface::kParseInvalidArguments;
}
break;
case vertex_struct::kColor:
if (semantic_index >= 2) {
return BufferSyncInterface::kParseInvalidArguments;
}
break;
case vertex_struct::kTexCoord:
if (semantic_index >= 8) {
return BufferSyncInterface::kParseInvalidArguments;
}
break;
default:
DLOG(FATAL) << "Not reached.";
break;
}
if (vertex_buffer_id == current_vertex_struct_) validate_streams_ = true;
VertexStructGL *vertex_struct = vertex_structs_.Get(vertex_struct_id);
if (!vertex_struct || input_index >= vertex_struct->count())
return BufferSyncInterface::kParseInvalidArguments;
vertex_struct->SetInput(input_index, vertex_buffer_id, offset, stride, type,
semantic, semantic_index);
return BufferSyncInterface::kParseNoError;
}
BufferSyncInterface::ParseError GAPIGL::SetVertexStruct(ResourceId id) {
current_vertex_struct_ = id;
validate_streams_ = true;
return BufferSyncInterface::kParseNoError;
}
bool GAPIGL::ValidateStreams() {
DCHECK(validate_streams_);
VertexStructGL *vertex_struct = vertex_structs_.Get(current_vertex_struct_);
if (!vertex_struct) {
LOG(ERROR) << "Drawing with invalid streams.";
return false;
}
max_vertices_ = vertex_struct->SetStreams(this);
validate_streams_ = false;
return max_vertices_ > 0;
}
namespace {
void PrimitiveTypeToGL(command_buffer::PrimitiveType primitive_type,
GLenum *gl_mode,
unsigned int *count) {
switch (primitive_type) {
case command_buffer::kPoints:
*gl_mode = GL_POINTS;
break;
case command_buffer::kLines:
*gl_mode = GL_LINES;
*count *= 2;
break;
case command_buffer::kLineStrips:
*gl_mode = GL_LINE_STRIP;
++*count;
break;
case command_buffer::kTriangles:
*gl_mode = GL_TRIANGLES;
*count *= 3;
break;
case command_buffer::kTriangleStrips:
*gl_mode = GL_TRIANGLE_STRIP;
*count += 2;
break;
case command_buffer::kTriangleFans:
*gl_mode = GL_TRIANGLE_FAN;
*count += 2;
break;
default:
LOG(FATAL) << "Invalid primitive type";
break;
}
}
} // anonymous namespace
BufferSyncInterface::ParseError GAPIGL::Draw(PrimitiveType primitive_type,
unsigned int first,
unsigned int count) {
if (validate_effect_ && !ValidateEffect()) {
return BufferSyncInterface::kParseInvalidArguments;
}
DCHECK(current_effect_);
if (validate_streams_ && !ValidateStreams()) {
return BufferSyncInterface::kParseInvalidArguments;
}
GLenum gl_mode = GL_POINTS;
PrimitiveTypeToGL(primitive_type, &gl_mode, &count);
if (first + count > max_vertices_) {
return BufferSyncInterface::kParseInvalidArguments;
}
glDrawArrays(gl_mode, first, count);
CHECK_GL_ERROR();
return BufferSyncInterface::kParseNoError;
}
BufferSyncInterface::ParseError GAPIGL::DrawIndexed(
PrimitiveType primitive_type,
ResourceId index_buffer_id,
unsigned int first,
unsigned int count,
unsigned int min_index,
unsigned int max_index) {
IndexBufferGL *index_buffer = index_buffers_.Get(index_buffer_id);
if (!index_buffer) return BufferSyncInterface::kParseInvalidArguments;
if (validate_effect_ && !ValidateEffect()) {
return BufferSyncInterface::kParseInvalidArguments;
}
DCHECK(current_effect_);
if (validate_streams_ && !ValidateStreams()) {
return BufferSyncInterface::kParseInvalidArguments;
}
if ((min_index >= max_vertices_) || (max_index > max_vertices_)) {
return BufferSyncInterface::kParseInvalidArguments;
}
GLenum gl_mode = GL_POINTS;
PrimitiveTypeToGL(primitive_type, &gl_mode, &count);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->gl_buffer());
GLenum index_type = (index_buffer->flags() & index_buffer::kIndex32Bit) ?
GL_UNSIGNED_INT : GL_UNSIGNED_SHORT;
GLuint index_size = (index_buffer->flags() & index_buffer::kIndex32Bit) ?
sizeof(GLuint) : sizeof(GLushort); // NOLINT
GLuint offset = first * index_size;
if (offset + count * index_size > index_buffer->size()) {
return BufferSyncInterface::kParseInvalidArguments;
}
glDrawRangeElements(gl_mode, min_index, max_index, count, index_type,
OffsetToPtr(offset));
CHECK_GL_ERROR();
return BufferSyncInterface::kParseNoError;
}
} // namespace command_buffer
} // namespace o3d
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