pcsx2/plugins/GSdx/GSVertexArrayOGL.h

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/*
* Copyright (C) 2011-2011 Gregory hainaut
* Copyright (C) 2007-2009 Gabest
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#pragma once
struct GSInputLayoutOGL {
GLuint index;
GLint size;
GLenum type;
GLboolean normalize;
GLsizei stride;
const GLvoid* offset;
};
class GSBufferOGL {
size_t m_stride;
size_t m_start;
size_t m_count;
size_t m_limit;
GLenum m_target;
GLuint m_buffer;
size_t m_default_size;
public:
GSBufferOGL(GLenum target, size_t stride) :
m_stride(stride)
, m_start(0)
, m_count(0)
, m_limit(0)
, m_target(target)
{
glGenBuffers(1, &m_buffer);
// Opengl works best with 1-4MB buffer.
m_default_size = 2 * 1024 * 1024 / m_stride;
}
~GSBufferOGL() { glDeleteBuffers(1, &m_buffer); }
void allocate() { allocate(m_default_size); }
void allocate(size_t new_limit)
{
m_start = 0;
m_limit = new_limit;
glBufferData(m_target, m_limit * m_stride, NULL, GL_STREAM_DRAW);
}
void bind()
{
glBindBuffer(m_target, m_buffer);
}
void upload(const void* src, uint32 count)
{
// Upload the data to the buffer
void* dst;
if (Map(&dst, count)) {
// FIXME which one to use
// GSVector4i::storent(dst, src, m_count * m_stride);
memcpy(dst, src, m_stride*m_count);
Unmap();
}
}
bool Map(void** pointer, uint32 count ) {
#ifdef OGL_DEBUG
GLint b_size = -1;
glGetBufferParameteriv(m_target, GL_BUFFER_SIZE, &b_size);
if (b_size <= 0) return false;
#endif
m_count = count;
// Note: For an explanation of the map flag
// see http://www.opengl.org/wiki/Buffer_Object_Streaming
uint32 map_flags = GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
// Current GPU buffer is really too small need to allocate a new one
if (m_count > m_limit) {
allocate(std::max<int>(m_count * 3 / 2, m_default_size));
} else if (m_count > (m_limit - m_start) ) {
// Not enough left free room. Just go back at the beginning
m_start = 0;
// Tell the driver that it can orphan previous buffer and restart from a scratch buffer.
// Technically the buffer will not be accessible by the application anymore but the
// GL will effectively remove it when draws call are finised.
map_flags |= GL_MAP_INVALIDATE_BUFFER_BIT;
} else {
// Tell the driver that it doesn't need to contain any valid buffer data, and that you promise to write the entire range you map
map_flags |= GL_MAP_INVALIDATE_RANGE_BIT;
}
// Upload the data to the buffer
*pointer = (uint8*) glMapBufferRange(m_target, m_stride*m_start, m_stride*m_count, map_flags);
//fprintf(stderr, "Map %x from %d to %d\n", *pointer, m_start, m_start+m_count);
#ifdef OGL_DEBUG
if (*pointer == NULL) {
fprintf(stderr, "CRITICAL ERROR map failed for vb!!!\n");
return false;
}
#endif
return true;
}
void Unmap() { glUnmapBuffer(m_target); }
void EndScene()
{
m_start += m_count;
m_count = 0;
}
void Draw(GLenum mode)
{
glDrawArrays(mode, m_start, m_count);
}
void Draw(GLenum mode, GLint basevertex)
{
glDrawElementsBaseVertex(mode, m_count, GL_UNSIGNED_INT, (void*)(m_start * m_stride), basevertex);
}
void Draw(GLenum mode, GLint basevertex, int offset, int count)
{
glDrawElementsBaseVertex(mode, count, GL_UNSIGNED_INT, (void*)((m_start + offset) * m_stride), basevertex);
}
size_t GetStart() { return m_start; }
void debug()
{
fprintf(stderr, "data buffer: start %d, count %d\n", m_start, m_count);
}
};
class GSVertexBufferStateOGL {
GSBufferOGL *m_vb;
GSBufferOGL *m_ib;
GLuint m_va;
GLenum m_topology;
public:
GSVertexBufferStateOGL(size_t stride, GSInputLayoutOGL* layout, uint32 layout_nbr)
{
glGenVertexArrays(1, &m_va);
m_vb = new GSBufferOGL(GL_ARRAY_BUFFER, stride);
m_ib = new GSBufferOGL(GL_ELEMENT_ARRAY_BUFFER, sizeof(uint32));
bind();
// Note: index array are part of the VA state so it need to be bind only once.
m_ib->bind();
m_vb->allocate();
m_ib->allocate();
set_internal_format(layout, layout_nbr);
}
void bind()
{
glBindVertexArray(m_va);
m_vb->bind();
}
void set_internal_format(GSInputLayoutOGL* layout, uint32 layout_nbr)
{
for (uint i = 0; i < layout_nbr; i++) {
// Note this function need both a vertex array object and a GL_ARRAY_BUFFER buffer
glEnableVertexAttribArray(layout[i].index);
switch (layout[i].type) {
case GL_UNSIGNED_SHORT:
case GL_UNSIGNED_INT:
// Rule: when shader use integral (not normalized) you must use glVertexAttribIPointer (note the extra I)
glVertexAttribIPointer(layout[i].index, layout[i].size, layout[i].type, layout[i].stride, layout[i].offset);
break;
default:
glVertexAttribPointer(layout[i].index, layout[i].size, layout[i].type, layout[i].normalize, layout[i].stride, layout[i].offset);
break;
}
}
}
void EndScene()
{
m_vb->EndScene();
m_ib->EndScene();
}
void DrawPrimitive() { m_vb->Draw(m_topology); }
void DrawIndexedPrimitive() { m_ib->Draw(m_topology, m_vb->GetStart() ); }
void DrawIndexedPrimitive(int offset, int count) { m_ib->Draw(m_topology, m_vb->GetStart(), offset, count ); }
void SetTopology(GLenum topology) { m_topology = topology; }
void UploadVB(const void* vertices, size_t count) { m_vb->upload(vertices, count); }
void UploadIB(const void* index, size_t count) { m_ib->upload(index, count); }
bool MapVB(void **pointer, size_t count) { return m_vb->Map(pointer, count); }
void UnmapVB() { m_vb->Unmap(); }
~GSVertexBufferStateOGL()
{
glDeleteVertexArrays(1, &m_va);
delete m_vb;
delete m_ib;
}
void debug()
{
string topo;
switch (m_topology) {
case GL_POINTS:
topo = "point";
break;
case GL_LINES:
topo = "line";
break;
case GL_TRIANGLES:
topo = "triangle";
break;
case GL_TRIANGLE_STRIP:
topo = "triangle strip";
break;
}
m_vb->debug();
m_ib->debug();
fprintf(stderr, "primitives of %s\n", topo.c_str());
}
};