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Added Shader:getExternVariable(name).

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Returns the base type name ('float', 'image', etc.), the number of components (2 for a vec2), and number of array elements (1 for a non-array variable) for the extern variable with the specified name in the shader.

Returns nil if the variable either doesn't exist or was optimized out by the driver's shader compiler.
This commit is contained in:
Alex Szpakowski
2014-04-25 20:32:42 -03:00
parent 853f741ba3
commit f30a0d72f0
4 changed files with 114 additions and 22 deletions
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src/modules/graphics/opengl/Shader.h
+36 -16
View File
@@ -56,13 +56,24 @@ public:
TYPE_MAX_ENUM
};
// Built-in extern (uniform) variables.
enum BuiltinExtern
// Built-in uniform (extern) variables.
enum BuiltinUniform
{
BUILTIN_SCREEN_SIZE,
BUILTIN_MAX_ENUM
};
// Types of potential uniform (extern) variables used in love's shaders.
enum UniformType
{
UNIFORM_FLOAT,
UNIFORM_INT,
UNIFORM_BOOL,
UNIFORM_SAMPLER,
UNIFORM_UNKNOWN,
UNIFORM_MAX_ENUM
};
// Type for a list of shader source codes in the form of sources[shadertype] = code
typedef std::map<ShaderType, std::string> ShaderSources;
@@ -135,12 +146,25 @@ public:
**/
void sendTexture(const std::string &name, Texture *texture);
/**
* Gets the type, number of components, and number of array elements of
* an active 'extern' (uniform) variable in the shader. If a uniform
* variable with the specified name doesn't exist, returns UNIFORM_UNKNOWN
* and sets the 'components' and 'count' values to 0.
*
* @param name The name of the uniform variable in the source code.
* @param[out] components Number of components of the variable (2 for vec2.)
* @param[out] count Number of array elements, if the variable is an array.
* @return The base type of the uniform variable.
**/
UniformType getExternVariable(const std::string &name, int &components, int &count);
/**
* Internal use only.
**/
bool hasVertexAttrib(OpenGL::VertexAttrib attrib) const;
bool hasBuiltinExtern(BuiltinExtern builtin) const;
bool sendBuiltinFloat(BuiltinExtern builtin, int size, const GLfloat *m, int count);
bool hasBuiltinUniform(BuiltinUniform builtin) const;
bool sendBuiltinFloat(BuiltinUniform builtin, int size, const GLfloat *m, int count);
void checkSetScreenParams();
const std::map<std::string, Object *> &getBoundRetainables() const;
@@ -148,17 +172,10 @@ public:
static std::string getGLSLVersion();
static bool isSupported();
private:
static bool getConstant(const char *in, UniformType &out);
static bool getConstant(UniformType in, const char *&out);
// Types of potential uniform variables used in love's shaders.
enum UniformType
{
UNIFORM_FLOAT,
UNIFORM_INT,
UNIFORM_BOOL,
UNIFORM_SAMPLER,
UNIFORM_UNKNOWN
};
private:
// Represents a single uniform/extern shader variable.
struct Uniform
@@ -227,13 +244,16 @@ private:
static StringMap<ShaderType, TYPE_MAX_ENUM>::Entry typeNameEntries[];
static StringMap<ShaderType, TYPE_MAX_ENUM> typeNames;
static StringMap<UniformType, UNIFORM_MAX_ENUM>::Entry uniformTypeEntries[];
static StringMap<UniformType, UNIFORM_MAX_ENUM> uniformTypes;
// Names for the generic vertex attributes used by love.
static StringMap<OpenGL::VertexAttrib, OpenGL::ATTRIB_MAX_ENUM>::Entry attribNameEntries[];
static StringMap<OpenGL::VertexAttrib, OpenGL::ATTRIB_MAX_ENUM> attribNames;
// Names for the built-in uniform variables.
static StringMap<BuiltinExtern, BUILTIN_MAX_ENUM>::Entry builtinNameEntries[];
static StringMap<BuiltinExtern, BUILTIN_MAX_ENUM> builtinNames;
static StringMap<BuiltinUniform, BUILTIN_MAX_ENUM>::Entry builtinNameEntries[];
static StringMap<BuiltinUniform, BUILTIN_MAX_ENUM> builtinNames;
};
} // opengl