*目录改为小写

1 files changed, 281 insertions, 0 deletions

diff --git a/src/libjin/graphics/shaders/je_shader.cpp b/src/libjin/graphics/shaders/je_shader.cpp
new file mode 100644
index 0000000..c1abbf0
--- /dev/null
+++ b/src/libjin/graphics/shaders/je_shader.cpp
@@ -0,0 +1,281 @@
+#include "../../core/je_configuration.h"
+#if defined(jin_graphics) && (jin_graphics & jin_graphics_shader)
+
+#include <iostream>
+
+#include "../../filesystem/je_buffer.h"
+#include "../../utils/je_macros.h"
+
+#include "je_jsl_compiler.h"
+#include "je_shader.h"
+
+using namespace std;
+using namespace JinEngine::Filesystem;
+
+namespace JinEngine
+{
+	namespace Graphics
+	{
+        namespace Shaders
+        {
+
+            // 
+            // default_texture
+            // base_shader
+            // SHADER_FORMAT_SIZE
+            // formatShader
+            // 
+#include "built-in/je_default.shader.h"
+
+// 
+// https://stackoverflow.com/questions/27941496/use-sampler-without-passing-through-value
+// The default value of a sampler variable is 0. From the GLSL 3.30 spec,
+//     section "4.3.5 Uniforms":
+// 
+// The link time initial value is either the value of the variable's 
+// initializer, if present, or 0 if no initializer is present.Sampler
+// types cannot have initializers.
+// 
+// Since a value of 0 means that it's sampling from texture unit 0, it will 
+// work without ever setting the value as long as you bind your textures to
+// unit 0. This is well defined behavior.
+// 
+// Since texture unit 0 is also the default until you call glActiveTexture()
+// with a value other than GL_TEXTURE0, it's very common to always use unit 
+// 0 as long as shaders do not need more than one texture.Which means that
+// often times, setting the sampler uniforms is redundant for simple
+// applications.
+// 
+// I would still prefer to always set the values.If nothing else, it makes
+// it clear to anybody reading your code that you really mean to sample from
+// texture unit 0, and did not just forget to set the value.
+// 
+            const int DEFAULT_TEXTURE_UNIT = 0;
+
+            /*static*/ Shader* Shader::CurrentShader = nullptr;
+
+            Shader* Shader::createShader(const string& program)
+            {
+                Shader* shader = nullptr;
+                try
+                {
+                    shader = new Shader(program);
+                }
+                catch (...)
+                {
+                    return nullptr;
+                }
+                return shader;
+            }
+
+            Shader::Shader(const string& program)
+                : mCurrentTextureUnit(DEFAULT_TEXTURE_UNIT)
+            {
+                if (!compile(program))
+                    throw 0;
+            }
+
+            Shader::~Shader()
+            {
+                if (CurrentShader == this)
+                    unuse();
+                // delete shader program 
+                glDeleteShader(mPID);
+            }
+
+            bool Shader::compile(const string& program)
+            {
+                string vertex_shader, fragment_shader;
+                // Compile JSL shader source into GLSL shader source. 
+                JSLCompiler* compiler = JSLCompiler::get();
+                if (!compiler->compile(program, &vertex_shader, &fragment_shader))
+                {
+                    return false;
+                }
+#define glsl(SHADER_MODE, SHADER, SRC)              \
+do{                                                 \
+const GLchar* src = SRC.c_str();                    \
+glShaderSource(SHADER, 1, &src, NULL);              \
+glCompileShader(SHADER);                            \
+GLint success;                                      \
+glGetShaderiv(SHADER, GL_COMPILE_STATUS, &success); \
+if (success == GL_FALSE)                            \
+    return false;                                   \
+}while(0)
+                // Compile vertex shader.
+                GLuint vid = glCreateShader(GL_VERTEX_SHADER);
+                glsl(GL_VERTEX_SHADER, vid, vertex_shader);
+                // Compile fragment shader.
+                GLuint fid = glCreateShader(GL_FRAGMENT_SHADER);
+                glsl(GL_FRAGMENT_SHADER, fid, fragment_shader);
+#undef glsl
+                // Create OpenGL shader program.
+                mPID = glCreateProgram();
+                glAttachShader(mPID, vid);
+                glAttachShader(mPID, fid);
+                glLinkProgram(mPID);
+                GLint success;
+                glGetProgramiv(mPID, GL_LINK_STATUS, &success);
+                if (success == GL_FALSE)
+                    return false;
+            }
+
+            static inline GLint getMaxTextureUnits()
+            {
+                GLint maxTextureUnits = 0;
+                glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
+                return maxTextureUnits;
+            }
+
+            void Shader::use()
+            {
+                glUseProgram(mPID);
+                CurrentShader = this;
+                sendInt(SHADER_MAIN_TEXTURE, DEFAULT_TEXTURE_UNIT);
+            }
+
+            /*static*/ void Shader::unuse()
+            {
+                glUseProgram(0);
+                CurrentShader = nullptr;
+            }
+
+            GLint Shader::claimTextureUnit(const std::string& name)
+            {
+                std::map<std::string, GLint>::iterator unit = mTextureUnits.find(name);
+                if (unit != mTextureUnits.end())
+                    return unit->second;
+                static GLint MAX_TEXTURE_UNITS = getMaxTextureUnits();
+                if (++mCurrentTextureUnit >= MAX_TEXTURE_UNITS)
+                    return 0;
+                mTextureUnits[name] = mCurrentTextureUnit;
+                return mCurrentTextureUnit;
+            }
+
+#define checkJSL() \
+		if (CurrentShader != this) \
+			 return
+
+            void Shader::sendInt(const char* name, int value)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, name);
+                glUniform1i(loc, value);
+            }
+
+            void Shader::sendFloat(const char* variable, float number)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, variable);
+                glUniform1f(loc, number);
+            }
+
+            // 
+            // https://www.douban.com/note/627332677/
+            // struct TextureUnit
+            // {
+            //     GLuint targetTexture1D;
+            //     GLuint targetTexture2D;
+            //     GLuint targetTexture3D;
+            //     GLuint targetTextureCube;
+            //     ...
+            // };
+            // 
+            // TextureUnit mTextureUnits[GL_MAX_TEXTURE_IMAGE_UNITS]
+            // GLuint mCurrentTextureUnit = 0;
+            // 
+            void Shader::sendTexture(const char* variable, const Texture* tex)
+            {
+                checkJSL();
+                GLint location = glGetUniformLocation(mPID, variable);
+                if (location == -1)
+                    return;
+                GLint unit = claimTextureUnit(variable);
+                if (unit == 0)
+                {
+                    // TODO: �쳣�������󶨵����������������
+                    return;
+                }
+                gl.activeTexUnit(unit);
+                glUniform1i(location, unit);
+                gl.bindTexture(tex->getGLTexture());
+                gl.activeTexUnit(0);
+            }
+
+            void Shader::sendCanvas(const char* variable, const Canvas* canvas)
+            {
+                checkJSL();
+                GLint location = glGetUniformLocation(mPID, variable);
+                if (location == -1)
+                    return;
+                GLint unit = claimTextureUnit(variable);
+                if (unit == 0)
+                {
+                    // TODO: �쳣�������󶨵����������������
+                    return;
+                }
+                glUniform1i(location, unit);
+                glActiveTexture(GL_TEXTURE0 + unit);
+                gl.bindTexture(canvas->getGLTexture());
+
+                glActiveTexture(GL_TEXTURE0);
+            }
+
+            void Shader::sendVec2(const char* name, float x, float y)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, name);
+                glUniform2f(loc, x, y);
+            }
+
+            void Shader::sendVec3(const char* name, float x, float y, float z)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, name);
+                glUniform3f(loc, x, y, z);
+            }
+
+            void Shader::sendVec4(const char* name, float x, float y, float z, float w)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, name);
+                glUniform4f(loc, x, y, z, w);
+            }
+
+            void Shader::sendColor(const char* name, const Color* col)
+            {
+                checkJSL();
+                int loc = glGetUniformLocation(mPID, name);
+                glUniform4f(loc,
+                    col->r / 255.f,
+                    col->g / 255.f,
+                    col->b / 255.f,
+                    col->a / 255.f
+                );
+            }
+
+            void Shader::sendMatrix4(const char* name, const Math::Matrix* mat4)
+            {
+                int loc = glGetUniformLocation(mPID, name);
+                glUniformMatrix4fv(loc, 1, GL_FALSE, mat4->getElements());
+            }
+
+            void Shader::setVertexPointer(int n, GLenum type, GLsizei stride, const GLvoid * pointers)
+            {
+                GLint loc = glGetAttribLocation(mPID, SHADER_VERTEX_COORDS);
+                glEnableVertexAttribArray(0);
+                glVertexAttribPointer(loc, n, type, GL_FALSE, stride, pointers);
+            }
+
+            void Shader::setUVPointer(int n, GLenum type, GLsizei stride, const GLvoid * pointers)
+            {
+                GLint loc = glGetAttribLocation(mPID, SHADER_TEXTURE_COORDS);
+                glEnableVertexAttribArray(1);
+                glVertexAttribPointer(loc, n, type, GL_FALSE, stride, pointers);
+            }
+
+        } // namespace Shaders
+	} // namespace Graphics
+} // namespace JinEngine
+
+#endif // (jin_graphics) && (jin_graphics & jin_graphics_shader)
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