Added shader param buffer support

src/dawnopengl/display/shader/ShaderParameterBuffer.hpp

@@ -0,0 +1,99 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "assert/assert.hpp"
+#include "dawnopengl.hpp"
+#include "display/shader/_ShaderParameterBuffer.hpp"
+
+namespace Dawn {
+  typedef GLuint shaderbufferslot_t;
+  typedef GLuint shaderbufferlocation_t;
+  
+  template<typename T>
+  class ShaderParameterBuffer : public IShaderParameterBuffer<T, shaderbufferslot_t> {
+    protected:
+      shaderbufferlocation_t id = -1;
+      size_t size;
+
+    public:
+      void init() {
+        assertTrue(this->id == -1);
+        this->size = sizeof(T);
+
+        glGenBuffers(1, &this->id);
+
+        glBindBuffer(GL_UNIFORM_BUFFER, this->id);
+        glBufferData(GL_UNIFORM_BUFFER, this->size, NULL, GL_DYNAMIC_DRAW);
+      }
+
+      void buffer(T *data) override {
+        this->bufferRaw((void*)data);
+      }
+
+      void bind(shaderbufferslot_t location) override {
+        glBindBuffer(GL_UNIFORM_BUFFER, this->id);
+        glBindBufferBase(GL_UNIFORM_BUFFER, location, this->id); 
+      }
+
+      /**
+       * Buffers the entire contents of the data struct to this shader param
+       * buffer object.
+       * 
+       * @param data Raw data to buffer.
+       */
+      void bufferRaw(void *data) {
+        this->bufferRaw(data, 0, this->size);
+      }
+
+      /**
+       * Buffers a specific range of data to this shader param buffer object.
+       * 
+       * @param data Raw data to buffer.
+       * @param start Start position of the data to buffer.
+       * @param length Length of the data to buffer.
+       */
+      void bufferRaw(void *data, size_t start, size_t length) {
+        glBindBuffer(GL_UNIFORM_BUFFER, this->id);
+        glBufferSubData(GL_UNIFORM_BUFFER, start, length, (void*)((size_t)data + start));
+      }
+      
+      /**
+       * Buffers a sub-range of data to this shader param buffer object.
+       * 
+       * @param data Raw data to buffer.
+       * @param sub Pointer to the start of the sub-range.
+       */
+      template<typename D>
+      void buffer(T* data, D* sub) {
+        size_t start = (size_t)sub - (size_t)data;
+        this->bufferRaw((void*)data, start, sizeof(D));
+      }
+
+      /**
+       * Buffers a sub-range of data to this shader param buffer object.
+       * 
+       * @param data Raw data to buffer.
+       * @param subStart Pointer to the start of the sub-range.
+       * @param subEnd Pointer to the end of the sub-range, inclusive.
+       */
+      template<typename D0, typename D1>
+      void buffer(T *data, D0 *subStart, D1 *subEnd) {
+        this->bufferRaw(
+          (void*)data,
+          (size_t)subStart - (size_t)data,
+          ((size_t)subEnd - (size_t)subStart) + sizeof(D1)
+        );
+      }
+
+      /**
+       * Destroys this shader parameter buffer.
+       */
+      ~ShaderParameterBuffer() {
+        glDeleteBuffers(1, &this->id);
+        this->id = -1;
+      }
+  };
+}

src/dawnopengl/display/shader/ShaderProgram.cpp

@@ -88,6 +88,14 @@ shaderparameter_t ShaderProgram::getParameterByName(std::string name) {
   return glGetUniformLocation(this->shaderProgram, name.c_str());
 }
 
+shaderbufferlocation_t ShaderProgram::getBufferLocationByName(std::string name) {
+  return glGetUniformBlockIndex(this->shaderProgram, name.c_str());
+}
+
+void ShaderProgram::setParameterBuffer(shaderbufferlocation_t location, shaderbufferslot_t slot) {
+  glUniformBlockBinding(this->shaderProgram, location, slot);
+}
+
 void ShaderProgram::setMatrix(shaderparameter_t uniform, glm::mat4 matrix) {
   glUniformMatrix4fv(uniform, 1, GL_FALSE, glm::value_ptr(matrix));
 }

src/dawnopengl/display/shader/ShaderProgram.hpp

@@ -9,6 +9,8 @@
 #include "display/Color.hpp"
 #include "debug/debug.hpp"
 
+#include "ShaderParameterBuffer.hpp"
+
 typedef GLuint shaderparameter_t;
 
 namespace Dawn {
@@ -56,6 +58,14 @@ namespace Dawn {
        */
       shaderparameter_t getParameterByName(std::string name);
 
+      /**
+       * Locate a shader buffer parameter set by its name.
+       * 
+       * @param name Name of the buffer to get.
+       * @return The shader buffer.
+       */
+      shaderbufferlocation_t getBufferLocationByName(std::string name);
+
       /**
        * Method to request that this shader be compiled and put on the GPU. This
        * method should call the protected compileShader method.
@@ -63,6 +73,7 @@ namespace Dawn {
       virtual void compile() = 0;
 
       void bind() override;
+      void setParameterBuffer(shaderbufferlocation_t location, shaderbufferslot_t slot);
       void setMatrix(shaderparameter_t parameter, glm::mat4 matrix) override;
       void setBoolean(shaderparameter_t parameter, bool_t value) override;
       void setColor(shaderparameter_t parameter, struct Color color) override;

src/dawnopengl/display/shader/SimpleTexturedShader.cpp

@@ -33,6 +33,13 @@ void SimpleTexturedShaderProgram::compile() {
 
       // Fragment Shader
       "#version 330 core\n"
+
+      "layout (std140) uniform uniTest {\n"
+        "float r;\n"
+        "float g;\n"
+        "float b;\n"
+      "};\n"
+
       "in vec2 o_TextCoord;\n"
       "out vec4 o_Color;\n"
       "uniform vec4 u_Color;\n"
@@ -40,11 +47,12 @@ void SimpleTexturedShaderProgram::compile() {
       "uniform sampler2D u_Text;\n"
 
       "void main() {\n"
-        "if(u_HasTexture) {\n"
-          "o_Color = texture(u_Text, o_TextCoord) * u_Color;\n"
-        "} else {\n"
-          "o_Color = u_Color;"
-        "}\n"
+        // "if(u_HasTexture) {\n"
+        //   "o_Color = texture(u_Text, o_TextCoord) * u_Color;\n"
+        // "} else {\n"
+        //   "o_Color = u_Color;"
+        // "}\n"
+        "o_Color = vec4(r, g, b, 1);\n"
       "}\n"
     );
   #elif DAWN_OPENGL_HLSL
@@ -94,6 +102,29 @@ void SimpleTexturedShaderProgram::compile() {
   this->paramColor = this->getParameterByName("u_Color");
   this->paramTexture = this->getParameterByName("u_Text");
   this->paramHasTexture = this->getParameterByName("u_HasTexture");
+
+
+  this->test.init();
+  this->test.bind(0);
+  auto bufferLoc = this->getBufferLocationByName("uniTest");
+  this->setParameterBuffer(bufferLoc, 0);
+
+  struct Test123 data;
+  data.r = 1.0f;
+  data.g = 0.0f;
+  data.b = 1.0f;
+  this->test.buffer(&data);
+
+  data.g = 1.0f;
+  this->test.buffer(&data);
+
+  data.g = 0.0f;
+  data.b = 0.0f;
+  this->test.buffer(&data, &data.g);
+
+  data.g = 1.0f;
+  data.b = 0.0f;
+  this->test.buffer(&data, &data.g, &data.b);
 }
 
 

src/dawnopengl/display/shader/SimpleTexturedShader.hpp

@@ -6,10 +6,22 @@
 #pragma once
 #include "display/shader/ShaderManager.hpp"
 #include "scene/components/display/material/SimpleTexturedMaterial.hpp"
+#include "display/shader/ShaderParameterBuffer.hpp"
 
 namespace Dawn {
+  struct Test123 {
+    float_t r;
+    float_t g;
+    float_t b;
+  };
+
+  class SimpleTexturedShaderTest : public ShaderParameterBuffer<struct Test123> {
+  };
+  
   class SimpleTexturedShaderProgram : public ShaderProgram {
     public:
+      SimpleTexturedShaderTest test;
+
       shaderparameter_t paramProjection;
       shaderparameter_t paramView;
       shaderparameter_t paramModel;