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< title > GLM_GTC_type_ptr: Memory layout access< / title >
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< div class = "title" > GLM_GTC_type_ptr: Memory layout access< / div > < / div >
< div class = "ingroups" > < a class = "el" href = "a00134.html" > GTC Extensions (Stable)< / a > < / div > < / div > <!-- header -->
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< p > Handles the interaction between pointers and vector, matrix types. < / p >
< p > This extension defines an overloaded function, glm::value_ptr, which takes any of the < a class = "el" href = "a00140.html" > core template types< / a > . It returns a pointer to the memory layout of the object. Matrix types store their values in column-major order.< / p >
< p > This is useful for uploading data to matrices or copying data to buffer objects.< / p >
< p > Example: < / p >
< div class = "fragment" > < pre class = "fragment" > < span class = "preprocessor" > #include < < a class = "code" href = "a00034.html" title = "OpenGL Mathematics (glm.g-truc.net)" > glm/glm.hpp< / a > > < / span >
< span class = "preprocessor" > #include < < a class = "code" href = "a00107.html" title = "OpenGL Mathematics (glm.g-truc.net)" > glm/gtc/type_ptr.hpp< / a > > < / span >
< a class = "code" href = "a00138.html#ga8a44105c47072f9ea1413f15faa31f64" title = "3 components vector of floating-point numbers." > glm::vec3< / a > aVector(3);
< a class = "code" href = "a00138.html#gade0eb47c01f79384a6f38017ede17446" title = "4 columns of 4 components matrix of floating-point numbers." > glm::mat4< / a > someMatrix(1.0);
glUniform3fv(uniformLoc, 1, glm::value_ptr(aVector));
glUniformMatrix4fv(uniformMatrixLoc, 1, GL_FALSE, glm::value_ptr(someMatrix));
< / pre > < / div > < p > < < a class = "el" href = "a00107.html" title = "OpenGL Mathematics (glm.g-truc.net)" > glm/gtc/type_ptr.hpp< / a > > need to be included to use these functionalities. < / p >
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