ShaderMgr Class Reference

A simple shader cache class that gives us the correct shader depending on desired configuration. More...

#include <ShaderManager.hpp>

Public Types
enum	UNIFORM {   UNIFORM_MAT_MODELVIEW , UNIFORM_MAT_PROJECTION , UNIFORM_MAT_MVP , UNIFORM_MAT_NORMAL ,   UNIFORM_MAT_SHADOW0 , UNIFORM_MAT_SHADOW1 , UNIFORM_MAT_SHADOW2 , UNIFORM_MAT_SHADOW3 ,   UNIFORM_MAT_CUBEMVP , UNIFORM_TEX_DIFFUSE , UNIFORM_TEX_EMISSIVE , UNIFORM_TEX_BUMP ,   UNIFORM_TEX_HEIGHT , UNIFORM_TEX_SHADOW0 , UNIFORM_TEX_SHADOW1 , UNIFORM_TEX_SHADOW2 ,   UNIFORM_TEX_SHADOW3 , UNIFORM_MTL_SHININESS , UNIFORM_MTL_ALPHA , UNIFORM_MIX_AMBIENT ,   UNIFORM_MIX_DIFFUSE , UNIFORM_MIX_SPECULAR , UNIFORM_MIX_TORCHDIFFUSE , UNIFORM_MIX_EMISSIVE ,   UNIFORM_LIGHT_DIRECTION_VIEW , UNIFORM_TORCH_ATTENUATION , UNIFORM_VEC_COLOR , UNIFORM_VEC_SPLITDATA ,   UNIFORM_VEC_LIGHTORTHOSCALE , UNIFORM_FLOAT_ALPHA_THRESH }
	Enum for OpenGL shader uniform locations (faster than accessing by string each time) More...

Public Member Functions
QOpenGLShaderProgram *	getShader (const GlobalShaderParameters &globals, const S3DScene::Material *mat=nullptr)
	Returns a shader that supports the specified operations. Must be called within a GL context.
QOpenGLShaderProgram *	getDebugShader ()
	Returns the Frustum/Boundingbox Debug shader.
QOpenGLShaderProgram *	getCubeShader ()
	Returns the cubemapping shader.
QOpenGLShaderProgram *	getTextureShader ()
	Returns the basic texturing shader.
GLint	uniformLocation (const QOpenGLShaderProgram *shad, UNIFORM uni)
	Returns the location of this uniform for this shader, or -1 if this uniform does not exist. More...
void	clearCache ()
	Clears the shaders that have been created by this manager. Must be called within a GL context.

Detailed Description

A simple shader cache class that gives us the correct shader depending on desired configuration.

It also contains a uniform cache to avoid unnecessary glUniformLocation calls

Member Enumeration Documentation

UNIFORM

enum ShaderMgr::UNIFORM

Enum for OpenGL shader uniform locations (faster than accessing by string each time)

Enumerator
UNIFORM_MAT_MODELVIEW	Defines the ModelView matrix.
UNIFORM_MAT_PROJECTION	Defines the Projection matrix.
UNIFORM_MAT_MVP	Defines the combined ModelViewProjection matrix, used if shader needs no separation of the 2 for a bit of a speedup.
UNIFORM_MAT_NORMAL	Defines the 3x3 Normal matrix (transpose of the inverse MV matrix)
UNIFORM_MAT_SHADOW0	The shadow matrices (4x 4x4 Matrices)
UNIFORM_MAT_CUBEMVP	The first cube MVP (array mat4, total 6)
UNIFORM_TEX_DIFFUSE	Defines the Diffuse texture slot.
UNIFORM_TEX_EMISSIVE	Defines the emissive texture slot.
UNIFORM_TEX_BUMP	Defines the Bump texture slot.
UNIFORM_TEX_HEIGHT	Defines the Height texture slot.
UNIFORM_TEX_SHADOW0	Shadow maps, 4x.
UNIFORM_MTL_SHININESS	Material specular shininess (exponent)
UNIFORM_MTL_ALPHA	Material global transparency.
UNIFORM_MIX_AMBIENT	(Light ambient + const factor) * Material ambient or diffuse, depending on Illum model
UNIFORM_MIX_DIFFUSE	Light directional * Material diffuse.
UNIFORM_MIX_SPECULAR	Light specular * Material specular color.
UNIFORM_MIX_TORCHDIFFUSE	Torch color * mat diffuse.
UNIFORM_MIX_EMISSIVE	Material emissive color * light emissive.
UNIFORM_LIGHT_DIRECTION_VIEW	Light direction vector (view space)
UNIFORM_TORCH_ATTENUATION	Torchlight attenuation factor (1 float, like in the second model at http://framebunker.com/blog/lighting-2-attenuation/)
UNIFORM_VEC_COLOR	simple color vec4
UNIFORM_VEC_SPLITDATA	Squared frustum splits (vec4)
UNIFORM_VEC_LIGHTORTHOSCALE	Scaling of each frustum's light ortho projection (4xvec2)
UNIFORM_FLOAT_ALPHA_THRESH	Alpha test threshold.

Member Function Documentation

uniformLocation()

GLint ShaderMgr::uniformLocation ( const QOpenGLShaderProgram *  shad, UNIFORM  uni  )

inline

Returns the location of this uniform for this shader, or -1 if this uniform does not exist.

This is cached to elimate the overhead of the glGet calls