From 8ac93980ef87834fd431c97104baa441561a7ce0 Mon Sep 17 00:00:00 2001 From: Mikko Rasa Date: Wed, 20 Apr 2011 12:42:49 +0000 Subject: [PATCH] System for generating standard shaders based on flags --- source/program.cpp | 194 +++++++++++++++++++++++++++++++++++++++++++-- source/program.h | 46 ++++++++--- 2 files changed, 223 insertions(+), 17 deletions(-) diff --git a/source/program.cpp b/source/program.cpp index 1f28e956..eb9481f2 100644 --- a/source/program.cpp +++ b/source/program.cpp @@ -15,6 +15,78 @@ Distributed under the LGPL using namespace std; +namespace { + +const char *standard_vertex_src[] = +{ + "n", "attribute vec3 tangent;\n", + "n", "attribute vec3 binormal;\n", + "t|n", "varying vec2 v_texcoord;\n", + "s", "varying vec3 v_shadowcoord;\n", + "!lm", "varying vec4 v_color;\n", + "l!n", "varying vec3 v_normal;\n", + "l", "varying vec3 v_light_dir;\n", + "p", "varying vec3 v_eye_dir;\n", + 0, "void main()\n", + 0, "{\n", + 0, "\tvec4 eye_pos = gl_ModelViewMatrix*gl_Vertex;\n", + 0, "\tgl_Position = gl_ProjectionMatrix*eye_pos;\n", + "l", "\tvec3 eye_normal = gl_NormalMatrix*gl_Normal;\n", + "l!n", "\tv_normal = eye_normal;\n", + "n", "\tvec3 eye_tangent = gl_NormalMatrix*tangent;\n", + "n", "\tvec3 eye_binormal = gl_NormalMatrix*binormal;\n", + "l", "\tvec3 eye_light_dir = normalize(gl_LightSource[0].position.xyz-eye_pos.xyz*gl_LightSource[0].position.w);\n", + "n", "\tv_light_dir = vec3(dot(eye_tangent, eye_light_dir), dot(eye_binormal, eye_light_dir), dot(eye_normal, eye_light_dir));\n", + "l!n", "\tv_light_dir = eye_light_dir;\n", + "p", "\tvec3 eye_dir = -normalize(eye_pos.xyz);\n", + "pn", "\tv_eye_dir = vec3(dot(eye_tangent, eye_dir), dot(eye_binormal, eye_dir), dot(eye_normal, eye_dir));\n", + "p!n", "\tv_eye_dir = eye_dir;\n", + "t|n", "\tv_texcoord = gl_MultiTexCoord0.xy;\n", + "s", "\tv_shadowcoord = vec3(dot(gl_EyePlaneS[3], eye_pos), dot(gl_EyePlaneT[3], eye_pos), dot(gl_EyePlaneR[3], eye_pos));\n", + "!lm", "\tv_color = gl_Color;\n", + 0, "}", + 0, 0 +}; + +const char *standard_fragment_src[] = +{ + "t", "uniform sampler2D texture;\n", + "n", "uniform sampler2D normalmap;\n", + "s", "uniform sampler2DShadow shadow;\n", + "t|n", "varying vec2 v_texcoord;\n", + "s", "varying vec3 v_shadowcoord;\n", + "!lm", "varying vec4 v_color;\n", + "l!n", "varying vec3 v_normal;\n", + "l", "varying vec3 v_light_dir;\n", + "p", "varying vec3 v_eye_dir;\n", + 0, "void main()\n", + 0, "{\n", + "n", "\tvec3 n_normal = texture2D(normalmap, v_texcoord).xyz*2.0-1.0;\n", + "l!n", "\tvec3 n_normal = normalize(v_normal);\n", + "l", "\tfloat l_diffuse = max(dot(n_normal, normalize(v_light_dir)), 0.0);\n", + "p", "\tvec3 half = normalize(v_eye_dir+v_light_dir);\n", + "p", "\tfloat l_specular = pow(max(dot(half, n_normal), 0.0), gl_FrontMaterial.shininess);\n", + "s", "\tfloat l_shadow = shadow2D(shadow, v_shadowcoord).r;\n", + 0, "\tgl_FragColor = ", + "!t!l!m", "vec4(1.0, 1.0, 1.0, 1.0)", + "t", "texture2D(texture, v_texcoord)", + "l|mt", "*", + "!lm", "v_color", + "l", "((l_diffuse", + "lm", "*gl_FrontLightProduct[0].diffuse", + "p", "+l_specular", + "pm", "*gl_FrontLightProduct[0].specular", + "l", ")", + "s", "*l_shadow", + "lm", "+gl_FrontLightModelProduct.sceneColor", + "l", ")", + 0, ";\n", + 0, "}\n", + 0, 0 +}; + +} + namespace Msp { namespace GL { @@ -24,6 +96,15 @@ Program::Program(): init(); } +Program::Program(const StandardFeatures &features): + del_shaders(true) +{ + init(); + + add_standard_shaders(features); + link(); +} + Program::Program(const string &vert, const string &frag): del_shaders(true) { @@ -71,6 +152,52 @@ void Program::detach_shader(Shader &shader) } } +void Program::add_standard_shaders(const StandardFeatures &features) +{ + string flags = features.create_flags(); + string vertex_src = process_standard_source(standard_vertex_src, flags); + string fragment_src = process_standard_source(standard_fragment_src, flags); + attach_shader(*new Shader(VERTEX_SHADER, vertex_src)); + attach_shader(*new Shader(FRAGMENT_SHADER, fragment_src)); +} + +string Program::process_standard_source(const char **source, const string &flags) +{ + string result; + + for(unsigned i=0; source[i+1]; i+=2) + { + if(source[i]) + { + bool cond = true; + char oper = '&'; + for(const char *c=source[i]; *c; ++c) + { + if(*c>='a' && *c<='z') + { + bool found = (flags.find(*c)!=string::npos); + if(oper=='|') + cond = (cond || found); + else if(oper=='!') + cond = (cond && !found); + else if(oper=='&') + cond = (cond && found); + oper = '&'; + } + else + oper = *c; + } + + if(!cond) + continue; + } + + result += source[i+1]; + } + + return result; +} + void Program::set_del_shaders(bool ds) { del_shaders = ds; @@ -133,19 +260,56 @@ void Program::unbind() } +Program::StandardFeatures::StandardFeatures(): + texture(false), + material(false), + lighting(false), + specular(false), + normalmap(false), + shadow(false) +{ } + +string Program::StandardFeatures::create_flags() const +{ + string flags; + if(texture) + flags += 't'; + if(material) + flags += 'm'; + if(lighting) + { + flags += 'l'; + if(specular) + flags += 'p'; + if(normalmap) + flags += 'n'; + } + if(shadow) + flags += 's'; + + return flags; +} + + Program::Loader::Loader(Program &p): DataFile::ObjectLoader(p) { obj.set_del_shaders(true); - add("vertex_shader", &Loader::vertex_shader); - add("fragment_shader", &Loader::fragment_shader); add("attribute", &Loader::attribute); + add("fragment_shader", &Loader::fragment_shader); + add("standard", &Loader::standard); + add("vertex_shader", &Loader::vertex_shader); } -void Program::Loader::vertex_shader(const string &src) +void Program::Loader::finish() { - obj.attach_shader(*new Shader(VERTEX_SHADER, src)); + obj.link(); +} + +void Program::Loader::attribute(unsigned i, const string &n) +{ + obj.bind_attribute(i, n); } void Program::Loader::fragment_shader(const string &src) @@ -153,14 +317,28 @@ void Program::Loader::fragment_shader(const string &src) obj.attach_shader(*new Shader(FRAGMENT_SHADER, src)); } -void Program::Loader::attribute(unsigned i, const string &n) +void Program::Loader::standard() { - obj.bind_attribute(i, n); + StandardFeatures feat; + load_sub(feat); + obj.add_standard_shaders(feat); } -void Program::Loader::finish() +void Program::Loader::vertex_shader(const string &src) { - obj.link(); + obj.attach_shader(*new Shader(VERTEX_SHADER, src)); +} + + +Program::StandardFeatures::Loader::Loader(StandardFeatures &f): + DataFile::ObjectLoader(f) +{ + add("lighting", &StandardFeatures::lighting); + add("material", &StandardFeatures::material); + add("normalmap", &StandardFeatures::normalmap); + add("shadow", &StandardFeatures::shadow); + add("specular", &StandardFeatures::specular); + add("texture", &StandardFeatures::texture); } } // namespace GL diff --git a/source/program.h b/source/program.h index 63d43e0f..1e41e844 100644 --- a/source/program.h +++ b/source/program.h @@ -21,12 +21,6 @@ class Shader; class Program: public Bindable { -private: - unsigned id; - std::list shaders; - bool del_shaders; - bool linked; - public: class Loader: public DataFile::ObjectLoader { @@ -34,13 +28,43 @@ public: Loader(Program &); private: - void vertex_shader(const std::string &); - void fragment_shader(const std::string &); - void attribute(unsigned, const std::string &); virtual void finish(); + + void attribute(unsigned, const std::string &); + void fragment_shader(const std::string &); + void standard(); + void vertex_shader(const std::string &); + }; + + struct StandardFeatures + { + class Loader: public DataFile::ObjectLoader + { + public: + Loader(StandardFeatures &); + }; + + bool texture; + bool material; + bool lighting; + bool specular; + bool normalmap; + bool shadow; + + StandardFeatures(); + + std::string create_flags() const; }; +private: + unsigned id; + std::list shaders; + bool del_shaders; + bool linked; + +public: Program(); + Program(const StandardFeatures &); Program(const std::string &, const std::string &); private: void init(); @@ -49,6 +73,10 @@ public: void attach_shader(Shader &shader); void detach_shader(Shader &shader); + void add_standard_shaders(const StandardFeatures &); +private: + static std::string process_standard_source(const char **, const std::string &); +public: const std::list &get_shaders() const { return shaders; } void set_del_shaders(bool); void bind_attribute(unsigned, const std::string &); -- 2.45.2