qtk/src/meshrenderer.h

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/*##############################################################################
## Author: Shaun Reed ##
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## Legal: All Content (c) 2022 Shaun Reed, all rights reserved ##
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## About: MeshRenderer class for quick object creation and drawing ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################*/
#ifndef QTK_MESHRENDERER_H
#define QTK_MESHRENDERER_H
#include <mesh.h>
#include <object.h>
#include <qtkapi.h>
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#include <utility>
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namespace Qtk {
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class QTKAPI ShaderBindScope {
public:
explicit ShaderBindScope(
QOpenGLShaderProgram * program, bool was_locked) :
mWasBound(was_locked) {
mProgram = program;
if(!mWasBound) {
mProgram->bind();
}
}
~ShaderBindScope() {
if(!mWasBound) {
mProgram->release();
}
}
private:
QOpenGLShaderProgram * mProgram;
bool mWasBound;
};
class QTKAPI MeshRenderer : public Object {
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public:
// Delegate constructors
MeshRenderer(
const char * name, Vertices vertices, Indices indices,
DrawMode mode = QTK_DRAW_ARRAYS) :
MeshRenderer(
name, ShapeBase(mode, std::move(vertices), std::move(indices))) {}
explicit MeshRenderer(const char * name) :
MeshRenderer(name, Cube(QTK_DRAW_ELEMENTS)) {}
// Constructor
MeshRenderer(const char * name, const ShapeBase & shape);
~MeshRenderer() override;
// Retrieve a mesh by name stored within a static QHash
static MeshRenderer * getInstance(const QString & name);
void init();
void draw();
// Draw types like GL_TRIANGLES, GL_POINTS, GL_LINES, etc
void setDrawType(int drawType) { mDrawType = drawType; }
// Shader settings
inline void setShaderVertex(const std::string & vert) {
mVertexShader = vert;
}
inline void setShaderFragment(const std::string & frag) {
mFragmentShader = frag;
}
void setShaders(const std::string & vert, const std::string & frag);
template <typename T> inline void setUniform(int location, T value) {
ShaderBindScope lock(&mProgram, mBound);
mProgram.setUniformValue(location, value);
}
template <typename T>
inline void setUniform(const char * location, T value) {
ShaderBindScope lock(&mProgram, mBound);
mProgram.setUniformValue(location, value);
}
// Set MVP matrix using this Object's transform
// + View and projection provided by MainWidget static members
void setUniformMVP(
const char * model = "uModel", const char * view = "uView",
const char * projection = "uProjection");
// These functions modify data stored in a VBO
// + After calling them, the VBO will need to be reallocated
void setShape(const Shape & value) override;
void setColor(const QVector3D & color);
void setAttributeBuffer(
int location, GLenum type, int offset, int tupleSize,
int stride = 0) {
ShaderBindScope lock(&mProgram, mBound);
mVAO.bind();
mProgram.setAttributeBuffer(location, type, offset, tupleSize, stride);
mVAO.release();
}
inline void enableAttributeArray(int location) {
ShaderBindScope lock(&mProgram, mBound);
mVAO.bind();
mProgram.enableAttributeArray(location);
mVAO.release();
}
void reallocateTexCoords(const TexCoords & t, unsigned dims = 2);
void reallocateNormals(const Normals & n, unsigned dims = 3);
// Static QHash of all mesh objects within the scene
typedef QHash<QString, MeshRenderer *> MeshManager;
private:
static MeshManager sInstances;
int mDrawType {};
std::string mVertexShader {}, mFragmentShader {};
};
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} // namespace Qtk
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#endif // QTK_MESHRENDERER_H