280 lines
7.3 KiB
C
280 lines
7.3 KiB
C
/*
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* SVGA3D example: Dynamic vertex buffers.
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*
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* This example shows how to efficiently stream vertex data to the
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* GPU, using multiple DMA buffers but a single vertex buffer. We
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* allocate DMA buffers from a pool every time we want to draw a new
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* dynamic mesh, then we asynchronously recycle those buffers after
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* the DMA transfer has completed.
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*
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* Copyright (C) 2008-2009 VMware, Inc. Licensed under the MIT
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* License, please see the README.txt. All rights reserved.
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*/
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#include "svga3dutil.h"
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#include "svga3dtext.h"
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#include "matrix.h"
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#include "math.h"
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#define MESH_WIDTH 128
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#define MESH_HEIGHT 128
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#define MESH_NUM_VERTICES (MESH_WIDTH * MESH_HEIGHT)
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#define MESH_NUM_QUADS ((MESH_WIDTH-1) * (MESH_HEIGHT-1))
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#define MESH_NUM_TRIANGLES (MESH_NUM_QUADS * 2)
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#define MESH_NUM_INDICES (MESH_NUM_TRIANGLES * 3)
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#define MESH_ELEMENT(x, y) (MESH_WIDTH * (y) + (x))
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typedef struct {
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float position[3];
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float color[3];
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} MyVertex;
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typedef uint16 IndexType;
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DMAPool vertexDMA;
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uint32 vertexSid, indexSid;
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Matrix perspectiveMat;
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FPSCounterState gFPS;
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/*
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* setupFrame --
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*
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* Set up render state that we load once per frame (because
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* SVGA3DText clobbered it) and perform matrix calculations that we
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* only need once per frame.
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*/
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void
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setupFrame(void)
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{
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static Matrix world;
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SVGA3dTextureState *ts;
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SVGA3dRenderState *rs;
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Matrix_Copy(world, gIdentityMatrix);
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Matrix_RotateX(world, -60.0 * PI_OVER_180);
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Matrix_RotateY(world, gFPS.frame * 0.001f);
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SVGA3D_SetTransform(CID, SVGA3D_TRANSFORM_WORLD, world);
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SVGA3D_SetTransform(CID, SVGA3D_TRANSFORM_PROJECTION, perspectiveMat);
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SVGA3D_BeginSetRenderState(CID, &rs, 4);
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{
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rs[0].state = SVGA3D_RS_BLENDENABLE;
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rs[0].uintValue = FALSE;
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rs[1].state = SVGA3D_RS_ZENABLE;
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rs[1].uintValue = TRUE;
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rs[2].state = SVGA3D_RS_ZWRITEENABLE;
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rs[2].uintValue = TRUE;
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rs[3].state = SVGA3D_RS_ZFUNC;
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rs[3].uintValue = SVGA3D_CMP_LESS;
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}
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SVGA_FIFOCommitAll();
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SVGA3D_BeginSetTextureState(CID, &ts, 4);
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{
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ts[0].stage = 0;
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ts[0].name = SVGA3D_TS_BIND_TEXTURE;
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ts[0].value = SVGA3D_INVALID_ID;
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ts[1].stage = 0;
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ts[1].name = SVGA3D_TS_COLOROP;
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ts[1].value = SVGA3D_TC_SELECTARG1;
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ts[2].stage = 0;
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ts[2].name = SVGA3D_TS_COLORARG1;
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ts[2].value = SVGA3D_TA_DIFFUSE;
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ts[3].stage = 0;
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ts[3].name = SVGA3D_TS_ALPHAARG1;
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ts[3].value = SVGA3D_TA_DIFFUSE;
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}
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SVGA_FIFOCommitAll();
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}
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/*
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* updateVertices --
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*
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* Calculate new vertices, writing them directly into an available
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* DMA buffer. Asynchronously begin DMA and recycle the buffer.
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*/
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void
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updateVertices(float red, float green, float blue, float phase, float offset)
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{
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DMAPoolBuffer *dma;
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MyVertex *vert;
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int x, y;
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float t = gFPS.frame * 0.01f + phase;
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dma = SVGA3DUtil_DMAPoolGetBuffer(&vertexDMA);
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vert = (MyVertex*) dma->buffer;
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for (y = 0; y < MESH_HEIGHT; y++) {
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for (x = 0; x < MESH_WIDTH; x++) {
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float fx = x * (2.0 / MESH_WIDTH) - 1.0;
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float fy = y * (2.0 / MESH_HEIGHT) - 1.0;
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float fxo = fx + offset;
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float dist = fxo * fxo + fy * fy;
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float z = sinf(dist * 8.0 + t) / (1 + dist * 10.0);
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vert->position[0] = fx;
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vert->position[1] = fy;
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vert->position[2] = z;
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vert->color[0] = red - z;
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vert->color[1] = green - z;
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vert->color[2] = blue - z;
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vert++;
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}
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}
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SVGA3DUtil_SurfaceDMA2D(vertexSid, &dma->ptr, SVGA3D_WRITE_HOST_VRAM,
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MESH_NUM_VERTICES * sizeof(MyVertex), 1);
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SVGA3DUtil_AsyncCall((AsyncCallFn) SVGA3DUtil_DMAPoolFreeBuffer, dma);
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}
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/*
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* drawMesh --
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*
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* Draw our mesh at a particular position. This uses the index and
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* vertex data which is resident in the host VRAM buffers at the
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* time the drawing command is executed asynchronously.
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*/
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void
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drawMesh(float posX, float posY, float posZ)
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{
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SVGA3dVertexDecl *decls;
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SVGA3dPrimitiveRange *ranges;
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static Matrix view;
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Matrix_Copy(view, gIdentityMatrix);
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Matrix_Translate(view, posX, posY, posZ);
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SVGA3D_SetTransform(CID, SVGA3D_TRANSFORM_VIEW, view);
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SVGA3D_BeginDrawPrimitives(CID, &decls, 2, &ranges, 1);
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{
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decls[0].identity.type = SVGA3D_DECLTYPE_FLOAT3;
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decls[0].identity.usage = SVGA3D_DECLUSAGE_POSITION;
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decls[0].array.surfaceId = vertexSid;
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decls[0].array.stride = sizeof(MyVertex);
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decls[0].array.offset = offsetof(MyVertex, position);
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decls[1].identity.type = SVGA3D_DECLTYPE_FLOAT3;
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decls[1].identity.usage = SVGA3D_DECLUSAGE_COLOR;
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decls[1].array.surfaceId = vertexSid;
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decls[1].array.stride = sizeof(MyVertex);
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decls[1].array.offset = offsetof(MyVertex, color);
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ranges[0].primType = SVGA3D_PRIMITIVE_TRIANGLELIST;
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ranges[0].primitiveCount = MESH_NUM_TRIANGLES;
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ranges[0].indexArray.surfaceId = indexSid;
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ranges[0].indexArray.stride = sizeof(IndexType);
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ranges[0].indexWidth = sizeof(IndexType);
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}
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SVGA_FIFOCommitAll();
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}
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/*
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* createIndexBuffer --
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*
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* Create a static index buffer that renders our vertices as a 2D
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* mesh. For simplicity, we use a triangle list rather than a
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* triangle strip.
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*/
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uint32
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createIndexBuffer(void)
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{
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IndexType *indexBuffer;
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const uint32 bufferSize = MESH_NUM_INDICES * sizeof *indexBuffer;
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SVGAGuestPtr gPtr;
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uint32 sid;
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int x, y;
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sid = SVGA3DUtil_DefineSurface2D(bufferSize, 1, SVGA3D_BUFFER);
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indexBuffer = SVGA3DUtil_AllocDMABuffer(bufferSize, &gPtr);
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for (y = 0; y < (MESH_HEIGHT - 1); y++) {
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for (x = 0; x < (MESH_WIDTH - 1); x++) {
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indexBuffer[0] = MESH_ELEMENT(x, y );
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indexBuffer[1] = MESH_ELEMENT(x+1, y );
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indexBuffer[2] = MESH_ELEMENT(x+1, y+1);
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indexBuffer[3] = MESH_ELEMENT(x+1, y+1);
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indexBuffer[4] = MESH_ELEMENT(x, y+1);
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indexBuffer[5] = MESH_ELEMENT(x, y );
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indexBuffer += 6;
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}
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}
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SVGA3DUtil_SurfaceDMA2D(sid, &gPtr, SVGA3D_WRITE_HOST_VRAM, bufferSize, 1);
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return sid;
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}
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/*
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* main --
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*
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* Our example's entry point, invoked directly by the bootloader.
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*/
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int
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main(void)
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{
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SVGA3DUtil_InitFullscreen(CID, 800, 600);
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SVGA3DText_Init();
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vertexSid = SVGA3DUtil_DefineSurface2D(MESH_NUM_VERTICES * sizeof(MyVertex),
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1, SVGA3D_BUFFER);
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indexSid = createIndexBuffer();
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SVGA3DUtil_AllocDMAPool(&vertexDMA, MESH_NUM_VERTICES * sizeof(MyVertex), 16);
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Matrix_Perspective(perspectiveMat, 45.0f,
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gSVGA.width / (float)gSVGA.height, 0.1f, 100.0f);
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while (1) {
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if (SVGA3DUtil_UpdateFPSCounter(&gFPS)) {
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Console_Clear();
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Console_Format("VMware SVGA3D Example:\n"
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"Dynamic vertex buffers.\n\n%s",
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gFPS.text);
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SVGA3DText_Update();
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}
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SVGA3DUtil_ClearFullscreen(CID, SVGA3D_CLEAR_COLOR | SVGA3D_CLEAR_DEPTH,
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0x113366, 1.0f, 0);
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setupFrame();
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updateVertices(1, 0.5, 0.5, M_PI, 0);
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drawMesh(-1.5, -1, 6);
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updateVertices(0.5, 1.0, 0.5, 0, 0);
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drawMesh(0, 1, 6);
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updateVertices(0.5, 0.5, 1.0, 0, 1.5);
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drawMesh(1.5, -1, 6);
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SVGA3DText_Draw();
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SVGA3DUtil_PresentFullscreen();
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}
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return 0;
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}
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