mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-11-28 18:45:54 -05:00
445 lines
10 KiB
C++
445 lines
10 KiB
C++
/*
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* Copyright 2013 Milos Tosic. All rights reserved.
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* License: http://www.opensource.org/licenses/BSD-2-Clause
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*/
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#include <string>
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#include <vector>
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#include "common.h"
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#include "bgfx_utils.h"
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#include "imgui/imgui.h"
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#include <bx/readerwriter.h>
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struct KnightPos
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{
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int32_t m_x;
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int32_t m_y;
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};
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KnightPos knightTour[8*4] =
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{
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{0,0}, {1,2}, {3,3}, {4,1}, {5,3}, {7,2}, {6,0}, {5,2},
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{7,3}, {6,1}, {4,0}, {3,2}, {2,0}, {0,1}, {1,3}, {2,1},
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{0,2}, {1,0}, {2,2}, {0,3}, {1,1}, {3,0}, {4,2}, {5,0},
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{7,1}, {6,3}, {5,1}, {7,0}, {6,2}, {4,3}, {3,1}, {2,3}
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};
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struct Aabb
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{
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float m_min[3];
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float m_max[3];
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};
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struct Obb
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{
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float m_mtx[16];
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};
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struct Sphere
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{
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float m_center[3];
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float m_radius;
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};
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struct Primitive
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{
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uint32_t m_startIndex;
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uint32_t m_numIndices;
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uint32_t m_startVertex;
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uint32_t m_numVertices;
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Sphere m_sphere;
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Aabb m_aabb;
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Obb m_obb;
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};
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typedef std::vector<Primitive> PrimitiveArray;
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struct Group
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{
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Group()
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{
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reset();
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}
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void reset()
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{
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m_vbh.idx = bgfx::invalidHandle;
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m_ibh.idx = bgfx::invalidHandle;
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m_prims.clear();
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}
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bgfx::VertexBufferHandle m_vbh;
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bgfx::IndexBufferHandle m_ibh;
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Sphere m_sphere;
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Aabb m_aabb;
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Obb m_obb;
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PrimitiveArray m_prims;
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};
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struct Mesh
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{
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void load(const char* _filePath)
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{
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#define BGFX_CHUNK_MAGIC_VB BX_MAKEFOURCC('V', 'B', ' ', 0x0)
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#define BGFX_CHUNK_MAGIC_IB BX_MAKEFOURCC('I', 'B', ' ', 0x0)
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#define BGFX_CHUNK_MAGIC_PRI BX_MAKEFOURCC('P', 'R', 'I', 0x0)
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bx::CrtFileReader reader;
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reader.open(_filePath);
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Group group;
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uint32_t chunk;
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while (4 == bx::read(&reader, chunk) )
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{
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switch (chunk)
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{
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case BGFX_CHUNK_MAGIC_VB:
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{
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bx::read(&reader, group.m_sphere);
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bx::read(&reader, group.m_aabb);
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bx::read(&reader, group.m_obb);
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bx::read(&reader, m_decl);
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uint16_t stride = m_decl.getStride();
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uint16_t numVertices;
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bx::read(&reader, numVertices);
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const bgfx::Memory* mem = bgfx::alloc(numVertices*stride);
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bx::read(&reader, mem->data, mem->size);
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group.m_vbh = bgfx::createVertexBuffer(mem, m_decl);
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}
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break;
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case BGFX_CHUNK_MAGIC_IB:
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{
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uint32_t numIndices;
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bx::read(&reader, numIndices);
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const bgfx::Memory* mem = bgfx::alloc(numIndices*2);
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bx::read(&reader, mem->data, mem->size);
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group.m_ibh = bgfx::createIndexBuffer(mem);
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}
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break;
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case BGFX_CHUNK_MAGIC_PRI:
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{
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uint16_t len;
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bx::read(&reader, len);
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std::string material;
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material.resize(len);
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bx::read(&reader, const_cast<char*>(material.c_str() ), len);
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uint16_t num;
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bx::read(&reader, num);
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for (uint32_t ii = 0; ii < num; ++ii)
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{
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bx::read(&reader, len);
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std::string name;
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name.resize(len);
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bx::read(&reader, const_cast<char*>(name.c_str() ), len);
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Primitive prim;
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bx::read(&reader, prim.m_startIndex);
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bx::read(&reader, prim.m_numIndices);
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bx::read(&reader, prim.m_startVertex);
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bx::read(&reader, prim.m_numVertices);
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bx::read(&reader, prim.m_sphere);
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bx::read(&reader, prim.m_aabb);
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bx::read(&reader, prim.m_obb);
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group.m_prims.push_back(prim);
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}
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m_groups.push_back(group);
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group.reset();
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}
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break;
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default:
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DBG("%08x at %d", chunk, reader.seek() );
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break;
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}
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}
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reader.close();
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}
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void unload()
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{
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for (GroupArray::const_iterator it = m_groups.begin(), itEnd = m_groups.end(); it != itEnd; ++it)
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{
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const Group& group = *it;
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bgfx::destroyVertexBuffer(group.m_vbh);
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if (bgfx::isValid(group.m_ibh) )
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{
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bgfx::destroyIndexBuffer(group.m_ibh);
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}
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}
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m_groups.clear();
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}
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void submit(bgfx::ProgramHandle _program, float* _mtx, bool _blend)
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{
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for (GroupArray::const_iterator it = m_groups.begin(), itEnd = m_groups.end(); it != itEnd; ++it)
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{
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const Group& group = *it;
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// Set model matrix for rendering.
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bgfx::setTransform(_mtx);
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bgfx::setProgram(_program);
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bgfx::setIndexBuffer(group.m_ibh);
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bgfx::setVertexBuffer(group.m_vbh);
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// Set render states.
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bgfx::setState(0
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| BGFX_STATE_RGB_WRITE
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| BGFX_STATE_ALPHA_WRITE
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| (_blend?0:BGFX_STATE_DEPTH_WRITE)
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| BGFX_STATE_DEPTH_TEST_LESS
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| BGFX_STATE_CULL_CCW
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| BGFX_STATE_MSAA
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| (_blend?BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA):0)
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);
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// Submit primitive for rendering to view 0.
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bgfx::submit(0);
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}
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}
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bgfx::VertexDecl m_decl;
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typedef std::vector<Group> GroupArray;
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GroupArray m_groups;
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};
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int _main_(int /*_argc*/, char** /*_argv*/)
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{
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uint32_t width = 1280;
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uint32_t height = 720;
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uint32_t debug = BGFX_DEBUG_TEXT;
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uint32_t reset = BGFX_RESET_VSYNC;
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bgfx::init();
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bgfx::reset(width, height, reset);
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// Enable debug text.
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bgfx::setDebug(debug);
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// Set view 0 clear state.
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bgfx::setViewClear(0
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, BGFX_CLEAR_COLOR_BIT|BGFX_CLEAR_DEPTH_BIT
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, 0x303030ff
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, 1.0f
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, 0
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);
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bgfx::UniformHandle u_texColor = bgfx::createUniform("u_texColor", bgfx::UniformType::Uniform1iv);
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bgfx::UniformHandle u_stipple = bgfx::createUniform("u_stipple", bgfx::UniformType::Uniform3fv);
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bgfx::UniformHandle u_texStipple = bgfx::createUniform("u_texStipple", bgfx::UniformType::Uniform1iv);
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bgfx::ProgramHandle program = loadProgram("vs_tree", "fs_tree");
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bgfx::TextureHandle textureLeafs = loadTexture("leafs1.dds");
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bgfx::TextureHandle textureBark = loadTexture("bark1.dds");
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bgfx::TextureHandle textureStipple;
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const bgfx::Memory* stipple = bgfx::alloc(8*4);
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memset(stipple->data, 0, stipple->size);
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for (uint32_t ii = 0; ii < 32; ++ii)
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{
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stipple->data[knightTour[ii].m_y * 8 + knightTour[ii].m_x] = ii*4;
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}
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textureStipple = bgfx::createTexture2D(8, 4, 1, bgfx::TextureFormat::R8, BGFX_TEXTURE_MAG_POINT|BGFX_TEXTURE_MIN_POINT, stipple);
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Mesh mesh_top[3];
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mesh_top[0].load("meshes/tree1b_lod0_1.bin");
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mesh_top[1].load("meshes/tree1b_lod1_1.bin");
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mesh_top[2].load("meshes/tree1b_lod2_1.bin");
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Mesh mesh_trunk[3];
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mesh_trunk[0].load("meshes/tree1b_lod0_2.bin");
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mesh_trunk[1].load("meshes/tree1b_lod1_2.bin");
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mesh_trunk[2].load("meshes/tree1b_lod2_2.bin");
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// Imgui.
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void* data = load("font/droidsans.ttf");
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imguiCreate(data);
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free(data);
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int32_t scrollArea = 0;
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bool transitions = true;
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int transitionFrame = 0;
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int currLOD = 0;
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int targetLOD = 0;
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float at[3] = { 0.0f, 1.0f, 0.0f };
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float eye[3] = { 0.0f, 1.0f, -2.0f };
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entry::MouseState mouseState;
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while (!entry::processEvents(width, height, debug, reset, &mouseState) )
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{
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imguiBeginFrame(mouseState.m_mx
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, mouseState.m_my
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, (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
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| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
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, 0
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, width
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, height
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);
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imguiBeginScrollArea("Toggle transitions", width - width / 5 - 10, 10, width / 5, height / 6, &scrollArea);
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imguiSeparatorLine();
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if (imguiButton(transitions ? "ON" : "OFF") )
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{
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transitions = !transitions;
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}
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static float distance = 2.0f;
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imguiSlider("Distance", &distance, 2.0f, 6.0f, .01f);
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imguiEndScrollArea();
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imguiEndFrame();
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, width, height);
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// This dummy draw call is here to make sure that view 0 is cleared
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// if no other draw calls are submitted to view 0.
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bgfx::submit(0);
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int64_t now = bx::getHPCounter();
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static int64_t last = now;
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const int64_t frameTime = now - last;
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last = now;
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const double freq = double(bx::getHPFrequency() );
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const double toMs = 1000.0/freq;
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// Use debug font to print information about this example.
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bgfx::dbgTextClear();
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bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/12-lod");
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bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Mesh LOD transitions.");
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bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
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bgfx::dbgTextPrintf(0, 4, transitions ? 0x2f : 0x1f, transitions ? "Transitions on" : "Transitions off");
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eye[2] = -distance;
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float view[16];
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float proj[16];
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mtxLookAt(view, eye, at);
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mtxProj(proj, 60.0f, float(width)/float(height), 0.1f, 100.0f);
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// Set view and projection matrix for view 0.
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bgfx::setViewTransform(0, view, proj);
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float mtx[16];
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mtxIdentity(mtx);
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float stipple[3];
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float stippleInv[3];
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const int currentLODframe = transitions ? 32-transitionFrame : 32;
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const int mainLOD = transitions ? currLOD : targetLOD;
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stipple[0] = 0.0f;
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stipple[1] = -1.0f;
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stipple[2] = (float(currentLODframe)*4.0f/255.0f) - (1.0f/255.0f);
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stippleInv[0] = (float(31)*4.0f/255.0f);
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stippleInv[1] = 1.0f;
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stippleInv[2] = (float(transitionFrame)*4.0f/255.0f) - (1.0f/255.0f);
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bgfx::setTexture(0, u_texColor, textureBark);
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bgfx::setTexture(1, u_texStipple, textureStipple);
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bgfx::setUniform(u_stipple, stipple);
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mesh_trunk[mainLOD].submit(program, mtx, false);
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bgfx::setTexture(0, u_texColor, textureLeafs);
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bgfx::setTexture(1, u_texStipple, textureStipple);
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bgfx::setUniform(u_stipple, stipple);
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mesh_top[mainLOD].submit(program, mtx, true);
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if (transitions
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&& (transitionFrame != 0) )
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{
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bgfx::setTexture(0, u_texColor, textureBark);
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bgfx::setTexture(1, u_texStipple, textureStipple);
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bgfx::setUniform(u_stipple, stippleInv);
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mesh_trunk[targetLOD].submit(program, mtx, false);
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bgfx::setTexture(0, u_texColor, textureLeafs);
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bgfx::setTexture(1, u_texStipple, textureStipple);
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bgfx::setUniform(u_stipple, stippleInv);
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mesh_top[targetLOD].submit(program, mtx, true);
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}
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int lod = 0;
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if (eye[2] < -2.5f)
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{
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lod = 1;
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}
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if (eye[2] < -5.0f)
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{
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lod = 2;
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}
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if (targetLOD!=lod)
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{
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if (targetLOD==currLOD)
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{
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targetLOD = lod;
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}
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}
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if (currLOD != targetLOD)
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{
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transitionFrame++;
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}
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if (transitionFrame>32)
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{
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currLOD = targetLOD;
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transitionFrame = 0;
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}
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// Advance to next frame. Rendering thread will be kicked to
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// process submitted rendering primitives.
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bgfx::frame();
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}
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imguiDestroy();
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for (uint32_t ii = 0; ii < 3; ++ii)
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{
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mesh_top[ii].unload();
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mesh_trunk[ii].unload();
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}
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// Cleanup.
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bgfx::destroyProgram(program);
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bgfx::destroyUniform(u_texColor);
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bgfx::destroyUniform(u_stipple);
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bgfx::destroyUniform(u_texStipple);
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bgfx::destroyTexture(textureStipple);
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bgfx::destroyTexture(textureLeafs);
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bgfx::destroyTexture(textureBark);
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// Shutdown bgfx.
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bgfx::shutdown();
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return 0;
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}
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