| 1 | // |
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| 2 | // Lol Engine - Framebuffer Object tutorial |
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| 3 | // |
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| 4 | // Copyright: (c) 2012 Sam Hocevar <sam@hocevar.net> |
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| 5 | // This program is free software; you can redistribute it and/or |
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| 6 | // modify it under the terms of the Do What The Fuck You Want To |
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| 7 | // Public License, Version 2, as published by Sam Hocevar. See |
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| 8 | // http://sam.zoy.org/projects/COPYING.WTFPL for more details. |
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| 9 | // |
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| 10 | |
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| 11 | #if defined HAVE_CONFIG_H |
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| 12 | # include "config.h" |
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| 13 | #endif |
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| 14 | |
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| 15 | #include "core.h" |
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| 16 | #include "loldebug.h" |
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| 17 | #include "lolgl.h" |
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| 18 | |
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| 19 | using namespace std; |
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| 20 | using namespace lol; |
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| 21 | |
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| 22 | #if defined _WIN32 |
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| 23 | # include <direct.h> |
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| 24 | #endif |
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| 25 | |
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| 26 | extern char const *lolfx_08_fbo; |
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| 27 | |
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| 28 | class FBO : public WorldEntity |
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| 29 | { |
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| 30 | public: |
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| 31 | FBO() |
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| 32 | { |
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| 33 | m_vertices << vec2( 1.0, 1.0); |
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| 34 | m_vertices << vec2(-1.0, -1.0); |
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| 35 | m_vertices << vec2( 1.0, -1.0); |
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| 36 | m_vertices << vec2(-1.0, -1.0); |
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| 37 | m_vertices << vec2( 1.0, 1.0); |
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| 38 | m_vertices << vec2(-1.0, 1.0); |
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| 39 | m_ready = false; |
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| 40 | } |
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| 41 | |
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| 42 | virtual void TickGame(float seconds) |
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| 43 | { |
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| 44 | WorldEntity::TickGame(seconds); |
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| 45 | |
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| 46 | m_time += seconds; |
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| 47 | m_hotspot = 0.4f * vec3(lol::cos(m_time * 2.f) + lol::cos(m_time * 3.3f), |
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| 48 | lol::sin(m_time * 4.4f) + lol::sin(m_time * 3.2f), |
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| 49 | lol::sin(m_time * 5.f)); |
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| 50 | m_color = 0.25f * vec3(3.f + lol::sin(m_time * 4.5f + 1.f), |
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| 51 | 3.f + lol::sin(m_time * 2.8f + 1.3f), |
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| 52 | 3.f + lol::sin(m_time * 3.7f)); |
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| 53 | } |
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| 54 | |
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| 55 | virtual void TickDraw(float seconds) |
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| 56 | { |
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| 57 | WorldEntity::TickDraw(seconds); |
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| 58 | |
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| 59 | if (!m_ready) |
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| 60 | { |
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| 61 | m_shader = Shader::Create(lolfx_08_fbo); |
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| 62 | m_coord = m_shader->GetAttribLocation("in_Position", VertexUsage::Position, 0); |
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| 63 | m_uni_point = m_shader->GetUniformLocation("in_Point"); |
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| 64 | m_uni_color = m_shader->GetUniformLocation("in_Color"); |
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| 65 | m_uni_flag = m_shader->GetUniformLocation("in_Flag"); |
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| 66 | m_uni_texture = m_shader->GetUniformLocation("in_Texture"); |
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| 67 | |
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| 68 | m_vdecl = new VertexDeclaration(VertexStream<vec2>(VertexUsage::Position)); |
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| 69 | |
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| 70 | m_vbo = new VertexBuffer(m_vertices.Bytes()); |
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| 71 | void *vertices = m_vbo->Lock(0, 0); |
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| 72 | memcpy(vertices, &m_vertices[0], m_vertices.Bytes()); |
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| 73 | m_vbo->Unlock(); |
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| 74 | |
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| 75 | m_fbo = new FrameBuffer(Video::GetSize()); |
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| 76 | m_fbo->Bind(); |
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| 77 | glClearColor(0.0, 0.0, 0.0, 1.0f); |
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| 78 | glClearDepth(1.0f); |
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| 79 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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| 80 | m_fbo->Unbind(); |
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| 81 | |
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| 82 | m_ready = true; |
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| 83 | |
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| 84 | /* FIXME: this object never cleans up */ |
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| 85 | } |
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| 86 | |
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| 87 | m_fbo->Bind(); |
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| 88 | /* FIXME: we should just disable depth test in the shader */ |
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| 89 | glClear(GL_DEPTH_BUFFER_BIT); |
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| 90 | m_shader->Bind(); |
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| 91 | m_shader->SetUniform(m_uni_flag, 0.f); |
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| 92 | m_shader->SetUniform(m_uni_point, m_hotspot); |
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| 93 | m_shader->SetUniform(m_uni_color, m_color); |
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| 94 | m_vdecl->SetStream(m_vbo, m_coord); |
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| 95 | m_vdecl->Bind(); |
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| 96 | m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2); |
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| 97 | m_vdecl->Unbind(); |
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| 98 | m_shader->Unbind(); |
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| 99 | m_fbo->Unbind(); |
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| 100 | |
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| 101 | m_shader->Bind(); |
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| 102 | m_shader->SetUniform(m_uni_flag, 1.f); |
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| 103 | m_shader->SetTexture(m_uni_texture, m_fbo->GetTexture(), 0); |
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| 104 | m_vdecl->SetStream(m_vbo, m_coord); |
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| 105 | m_vdecl->Bind(); |
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| 106 | m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2); |
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| 107 | m_vdecl->Unbind(); |
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| 108 | m_shader->Unbind(); |
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| 109 | } |
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| 110 | |
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| 111 | private: |
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| 112 | Array<vec2> m_vertices; |
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| 113 | Shader *m_shader; |
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| 114 | ShaderAttrib m_coord; |
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| 115 | ShaderUniform m_uni_flag, m_uni_point, m_uni_color, m_uni_texture; |
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| 116 | VertexDeclaration *m_vdecl; |
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| 117 | VertexBuffer *m_vbo; |
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| 118 | FrameBuffer *m_fbo; |
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| 119 | double m_time; |
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| 120 | vec3 m_hotspot, m_color; |
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| 121 | bool m_ready; |
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| 122 | }; |
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| 123 | |
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| 124 | int main(int argc, char **argv) |
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| 125 | { |
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| 126 | Application app("Tutorial 08: Framebuffer Object", ivec2(640, 480), 60.0f); |
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| 127 | |
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| 128 | #if defined _MSC_VER && !defined _XBOX |
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| 129 | _chdir(".."); |
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| 130 | #elif defined _WIN32 && !defined _XBOX |
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| 131 | _chdir("../.."); |
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| 132 | #endif |
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| 133 | |
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| 134 | new FBO(); |
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| 135 | |
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| 136 | app.Run(); |
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| 137 | return EXIT_SUCCESS; |
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| 138 | } |
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| 139 | |
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