1 files changed, 158 insertions, 0 deletions
diff --git a/src/libjin/Render/JSL.cpp b/src/libjin/Render/JSL.cpp
new file mode 100644
index 0000000..4ce660b
--- /dev/null
+++ b/src/libjin/Render/JSL.cpp
@@ -0,0 +1,158 @@
+#include "../modules.h"
+#if JIN_MODULES_RENDER
+
+#include "../utils/macros.h"
+#include "jsl.h"
+namespace jin
+{
+namespace render
+{
+    //vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) 
+    static const char* base_f = " "
+        //"#version 120             \n"
+        "#define number float     \n"
+        "#define Image sampler2D  \n"
+        "#define Canvas sampler2D \n"
+        "#define Color vec4       \n"
+        "#define Texel texture2D  \n"
+        "#define extern uniform   \n"
+        "uniform Image _tex0_;    \n"
+        "%s                       \n"
+        "void main(){             \n"
+        "   gl_FragColor = effect(gl_Color, _tex0_, gl_TexCoord[0].xy, gl_FragCoord.xy);\n"
+        "}\0";
+
+    shared JSLProgram* JSLProgram::currentJSLProgram = nullptr; 
+
+    JSLProgram* JSLProgram::createJSLProgram(const char* program)
+    {
+        return new JSLProgram(program);
+    }
+
+    JSLProgram::JSLProgram(const char* program)
+        : currentTextureUnit(0)
+    {
+        initialize(program);
+    }
+
+    JSLProgram::~JSLProgram()
+    {
+        destroy();
+    }
+
+    inline void JSLProgram::destroy()
+    {
+        if (currentJSLProgram == this)
+            unuse();
+    }
+
+    inline void JSLProgram::initialize(const char* program)
+    {
+        char* fs = (char*)alloca(strlen(program) + strlen(base_f));
+        sprintf(fs, base_f, program);
+        GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+        glShaderSource(fragmentShader, 1, (const GLchar**)&fs, NULL);
+        glCompileShader(fragmentShader);
+
+        pid = glCreateProgram();
+        glAttachShader(pid, fragmentShader);
+        glLinkProgram(pid);
+    }
+    
+    static inline GLint getMaxTextureUnits()
+    {
+        GLint maxTextureUnits = 0;
+        glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 
+        return maxTextureUnits; 
+    }
+
+    GLint JSLProgram::getTextureUnit(const std::string& name)
+    {
+        std::map<std::string, GLint>::iterator texture_unit = texturePool.find(name);
+        if (texture_unit != texturePool.end())
+            return texture_unit->second;
+        static GLint maxTextureUnits = getMaxTextureUnits();
+        if (++currentTextureUnit >= maxTextureUnits)
+            return 0;
+        texturePool[name] = currentTextureUnit;
+        return currentTextureUnit;
+    }
+
+#define checkJSL() if (currentJSLProgram != this) return
+
+    void JSLProgram::sendFloat(const char* variable, float number)
+    {
+        checkJSL();
+
+        int loc = glGetUniformLocation(pid, variable); 
+        glUniform1f(loc, number);
+    }
+
+    void JSLProgram::sendTexture(const char* variable, const Texture* tex)
+    {
+        checkJSL();
+
+        GLint location = glGetUniformLocation(pid, variable);
+        if (location == -1)
+            return;
+        GLint texture_unit = getTextureUnit(variable);
+        glUniform1i(location, texture_unit);
+        glActiveTexture(GL_TEXTURE0 + texture_unit);
+        glBindTexture(GL_TEXTURE_2D, tex->getTexture());
+        glActiveTexture(GL_TEXTURE0);
+    }
+
+    void JSLProgram::sendCanvas(const char* variable, const Canvas* canvas)
+    {
+        checkJSL();
+
+        GLint location = glGetUniformLocation(pid, variable);
+        if (location == -1)
+            return; 
+        GLint texture_unit = getTextureUnit(variable);
+        glUniform1i(location, texture_unit);
+        glActiveTexture(GL_TEXTURE0 + texture_unit);
+        glBindTexture(GL_TEXTURE_2D, canvas->getTexture());
+        glActiveTexture(GL_TEXTURE0);
+    }
+
+    void JSLProgram::sendVec2(const char* name, float x, float y)
+    {
+        checkJSL();
+
+        int loc = glGetUniformLocation(pid, name);
+        glUniform2f(loc, x, y);
+    }
+
+    void JSLProgram::sendVec3(const char* name, float x, float y, float z)
+    {
+        checkJSL();
+
+        int loc = glGetUniformLocation(pid, name);
+        glUniform3f(loc, x, y, z);
+    }
+
+    void JSLProgram::sendVec4(const char* name, float x, float y, float z, float w)
+    {
+        checkJSL();
+
+        int loc = glGetUniformLocation(pid, name);
+        glUniform4f(loc, x, y, z, w);
+    }
+    
+    void JSLProgram::sendColor(const char* name, const color* col) 
+    {
+        checkJSL();
+
+        int loc = glGetUniformLocation(pid, name);
+        glUniform4f(loc,
+            col->rgba.r / 255.f,
+            col->rgba.g / 255.f,
+            col->rgba.b / 255.f,
+            col->rgba.a / 255.f
+        );
+    }
+
+}
+}
+#endif // JIN_MODULES_RENDER