2012-05-13 17:09:18 +00:00
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/*
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* Copyright (C) 2011-2011 Gregory hainaut
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* Copyright (C) 2007-2009 Gabest
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*
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* This Program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This Program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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*/
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// Note: it is same code that was developed for GSdx plugin
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#pragma once
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#ifdef GLSL4_API
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struct GSInputLayoutOGL {
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GLuint index;
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GLint size;
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GLenum type;
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GLboolean normalize;
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GLsizei stride;
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const GLvoid* offset;
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};
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2012-05-13 17:22:36 +00:00
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class GSBufferOGL {
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size_t m_stride;
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size_t m_start;
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size_t m_count;
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size_t m_limit;
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GLenum m_target;
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GLuint m_buffer;
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size_t m_default_size;
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public:
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GSBufferOGL(GLenum target, size_t stride) :
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m_stride(stride)
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, m_start(0)
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, m_count(0)
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, m_limit(0)
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, m_target(target)
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{
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glGenBuffers(1, &m_buffer);
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// Opengl works best with 1-4MB buffer.
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m_default_size = 2 * 1024 * 1024 / m_stride;
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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~GSBufferOGL() { glDeleteBuffers(1, &m_buffer); }
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void allocate() { allocate(m_default_size); }
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void allocate(size_t new_limit)
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{
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m_start = 0;
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m_limit = new_limit;
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glBufferData(m_target, m_limit * m_stride, NULL, GL_STREAM_DRAW);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void bind()
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{
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glBindBuffer(m_target, m_buffer);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void upload(const void* src, uint32 count)
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{
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// Upload the data to the buffer
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void* dst;
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if (Map(&dst, count)) {
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// FIXME which one to use
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// GSVector4i::storent(dst, src, m_count * m_stride);
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memcpy(dst, src, m_stride*m_count);
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Unmap();
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2012-05-13 17:09:18 +00:00
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}
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2012-05-13 17:22:36 +00:00
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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bool Map(void** pointer, uint32 count ) {
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2012-05-13 17:09:18 +00:00
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#ifdef OGL_DEBUG
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2012-05-13 17:22:36 +00:00
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GLint b_size = -1;
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glGetBufferParameteriv(m_target, GL_BUFFER_SIZE, &b_size);
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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if (b_size <= 0) return false;
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2012-05-13 17:09:18 +00:00
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#endif
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2012-05-13 17:22:36 +00:00
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m_count = count;
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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// Note: For an explanation of the map flag
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// see http://www.opengl.org/wiki/Buffer_Object_Streaming
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uint32 map_flags = GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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// Current GPU buffer is really too small need to allocate a new one
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if (m_count > m_limit) {
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allocate(std::max<int>(m_count * 3 / 2, m_default_size));
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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} else if (m_count > (m_limit - m_start) ) {
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// Not enough left free room. Just go back at the beginning
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m_start = 0;
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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// Tell the driver that it can orphan previous buffer and restart from a scratch buffer.
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// Technically the buffer will not be accessible by the application anymore but the
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// GL will effectively remove it when draws call are finised.
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map_flags |= GL_MAP_INVALIDATE_BUFFER_BIT;
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} else {
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// 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
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map_flags |= GL_MAP_INVALIDATE_RANGE_BIT;
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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// Upload the data to the buffer
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*pointer = (uint8*) glMapBufferRange(m_target, m_stride*m_start, m_stride*m_count, map_flags);
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//fprintf(stderr, "Map %x from %d to %d\n", *pointer, m_start, m_start+m_count);
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2012-05-13 17:09:18 +00:00
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#ifdef OGL_DEBUG
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2012-05-13 17:22:36 +00:00
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if (*pointer == NULL) {
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fprintf(stderr, "CRITICAL ERROR map failed for vb!!!\n");
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return false;
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2012-05-13 17:09:18 +00:00
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}
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2012-05-13 17:22:36 +00:00
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#endif
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return true;
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void Unmap() { glUnmapBuffer(m_target); }
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void EndScene()
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{
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m_start += m_count;
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m_count = 0;
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void Draw(GLenum mode)
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{
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glDrawArrays(mode, m_start, m_count);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void Draw(GLenum mode, GLint basevertex)
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{
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glDrawElementsBaseVertex(mode, m_count, GL_UNSIGNED_INT, (void*)(m_start * m_stride), basevertex);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void Draw(GLenum mode, GLint basevertex, int offset, int count)
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{
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glDrawElementsBaseVertex(mode, count, GL_UNSIGNED_INT, (void*)((m_start + offset) * m_stride), basevertex);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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size_t GetStart() { return m_start; }
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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void debug()
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{
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fprintf(stderr, "data buffer: start %d, count %d\n", m_start, m_count);
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}
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2012-05-13 17:09:18 +00:00
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2012-05-13 17:22:36 +00:00
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};
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class GSVertexBufferStateOGL {
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GSBufferOGL *m_vb;
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GSBufferOGL *m_ib;
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2012-05-13 17:09:18 +00:00
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GLuint m_va;
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GLenum m_topology;
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public:
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GSVertexBufferStateOGL(size_t stride, GSInputLayoutOGL* layout, uint32 layout_nbr)
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{
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glGenVertexArrays(1, &m_va);
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m_vb = new GSBufferOGL(GL_ARRAY_BUFFER, stride);
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m_ib = new GSBufferOGL(GL_ELEMENT_ARRAY_BUFFER, sizeof(uint32));
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bind();
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// Note: index array are part of the VA state so it need to be bind only once.
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m_ib->bind();
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m_vb->allocate();
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m_ib->allocate();
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set_internal_format(layout, layout_nbr);
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}
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void bind()
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{
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glBindVertexArray(m_va);
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m_vb->bind();
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}
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void set_internal_format(GSInputLayoutOGL* layout, uint32 layout_nbr)
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{
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for (uint i = 0; i < layout_nbr; i++) {
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// Note this function need both a vertex array object and a GL_ARRAY_BUFFER buffer
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glEnableVertexAttribArray(layout[i].index);
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switch (layout[i].type) {
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case GL_UNSIGNED_SHORT:
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case GL_UNSIGNED_INT:
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2012-05-15 06:40:45 +00:00
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case GL_SHORT:
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case GL_INT:
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2012-05-13 17:09:18 +00:00
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// Rule: when shader use integral (not normalized) you must use glVertexAttribIPointer (note the extra I)
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glVertexAttribIPointer(layout[i].index, layout[i].size, layout[i].type, layout[i].stride, layout[i].offset);
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break;
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default:
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glVertexAttribPointer(layout[i].index, layout[i].size, layout[i].type, layout[i].normalize, layout[i].stride, layout[i].offset);
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break;
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}
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}
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}
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void EndScene()
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{
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m_vb->EndScene();
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m_ib->EndScene();
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}
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void DrawPrimitive() { m_vb->Draw(m_topology); }
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void DrawIndexedPrimitive() { m_ib->Draw(m_topology, m_vb->GetStart() ); }
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void DrawIndexedPrimitive(int offset, int count) { m_ib->Draw(m_topology, m_vb->GetStart(), offset, count ); }
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void SetTopology(GLenum topology) { m_topology = topology; }
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void UploadVB(const void* vertices, size_t count) { m_vb->upload(vertices, count); }
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void UploadIB(const void* index, size_t count) { m_ib->upload(index, count); }
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bool MapVB(void **pointer, size_t count) { return m_vb->Map(pointer, count); }
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void UnmapVB() { m_vb->Unmap(); }
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~GSVertexBufferStateOGL()
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{
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glDeleteVertexArrays(1, &m_va);
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2012-05-13 17:22:36 +00:00
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delete m_vb;
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delete m_ib;
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2012-05-13 17:09:18 +00:00
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}
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void debug()
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{
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string topo;
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switch (m_topology) {
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case GL_POINTS:
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topo = "point";
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break;
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case GL_LINES:
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topo = "line";
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break;
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case GL_TRIANGLES:
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topo = "triangle";
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break;
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case GL_TRIANGLE_STRIP:
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topo = "triangle strip";
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break;
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}
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m_vb->debug();
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m_ib->debug();
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fprintf(stderr, "primitives of %s\n", topo.c_str());
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}
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};
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#endif
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