129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
//=======================================================================
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// Copyright XashXT Group 2008 ©
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// r_backend.c - render backend interface
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//=======================================================================
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#include "r_local.h"
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ref_backend_t ref;
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ref_globals_t tr;
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/*
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=======================================================================
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VERTEX BUFFERS
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=======================================================================
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*/
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static ref_buffer_t rb_vertexBuffers[MAX_VERTEX_BUFFERS];
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static int rb_numVertexBuffers;
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/*
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=================
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RB_UpdateVertexBuffer
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=================
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*/
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void RB_UpdateVertexBuffer( ref_buffer_t *vertexBuffer, const void *data, size_t size )
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{
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if( !GL_Support( R_ARB_VERTEX_BUFFER_OBJECT_EXT ))
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{
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vertexBuffer->pointer = (char *)data;
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return;
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}
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if( !r_vertexbuffers->integer )
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{
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vertexBuffer->pointer = (char *)data;
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pglBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
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return;
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}
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vertexBuffer->pointer = NULL;
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pglBindBufferARB( GL_ARRAY_BUFFER_ARB, vertexBuffer->bufNum );
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pglBufferDataARB( GL_ARRAY_BUFFER_ARB, size, data, vertexBuffer->usage );
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}
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/*
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=================
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RB_AllocVertexBuffer
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=================
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*/
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ref_buffer_t *RB_AllocVertexBuffer( size_t size, GLuint usage )
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{
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ref_buffer_t *vertexBuffer;
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if( rb_numVertexBuffers == MAX_VERTEX_BUFFERS )
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Host_Error( "RB_AllocVertexBuffer: MAX_VERTEX_BUFFERS limit exceeds\n" );
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vertexBuffer = &rb_vertexBuffers[rb_numVertexBuffers++];
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vertexBuffer->pointer = NULL;
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vertexBuffer->size = size;
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vertexBuffer->usage = usage;
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if(!GL_Support( R_ARB_VERTEX_BUFFER_OBJECT_EXT ))
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return vertexBuffer;
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pglGenBuffersARB( 1, &vertexBuffer->bufNum );
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pglBindBufferARB( GL_ARRAY_BUFFER_ARB, vertexBuffer->bufNum );
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pglBufferDataARB( GL_ARRAY_BUFFER_ARB, vertexBuffer->size, NULL, vertexBuffer->usage );
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return vertexBuffer;
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}
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/*
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=================
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RB_DrawElements
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=================
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*/
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void RB_DrawElements( void )
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{
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elem_t *indices;
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indices = ref.indexArray;
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if( GL_Support( R_DRAW_RANGEELEMENTS_EXT ))
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pglDrawRangeElementsEXT( GL_TRIANGLES, 0, ref.numVertex, ref.numIndex, GL_UNSIGNED_INT, indices );
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else pglDrawElements( GL_TRIANGLES, ref.numIndex, GL_UNSIGNED_INT, indices );
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}
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/*
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=================
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RB_InitVertexBuffers
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=================
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*/
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void RB_InitVertexBuffers( void )
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{
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int i;
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ref.vertexBuffer = RB_AllocVertexBuffer( MAX_VERTEXES * sizeof(vec3_t), GL_STREAM_DRAW_ARB );
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ref.colorBuffer = RB_AllocVertexBuffer( MAX_VERTEXES * sizeof(rgba_t), GL_STREAM_DRAW_ARB );
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ref.normalBuffer = RB_AllocVertexBuffer( MAX_VERTEXES * sizeof(vec3_t), GL_STREAM_DRAW_ARB );
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for( i = 0; i < MAX_TEXTURE_UNITS; i++ )
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ref.texCoordBuffer[i] = RB_AllocVertexBuffer( MAX_VERTEXES * sizeof(vec3_t), GL_STREAM_DRAW_ARB );
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}
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/*
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=================
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RB_ShutdownVertexBuffers
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=================
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*/
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void RB_ShutdownVertexBuffers( void )
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{
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ref_buffer_t *vertexBuffer;
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int i;
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if( !GL_Support( R_ARB_VERTEX_BUFFER_OBJECT_EXT ))
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{
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Mem_Set( rb_vertexBuffers, 0, sizeof( rb_vertexBuffers ));
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rb_numVertexBuffers = 0;
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return;
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}
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pglBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
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for( i = 0, vertexBuffer = rb_vertexBuffers; i < rb_numVertexBuffers; i++, vertexBuffer++ )
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pglDeleteBuffersARB( 1, &vertexBuffer->bufNum );
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Mem_Set( rb_vertexBuffers, 0, sizeof( rb_vertexBuffers ));
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rb_numVertexBuffers = 0;
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}
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