i attempting use either glnamedbuffersubdata or glbuffersubdata overwrite vertices values in buffer doesn't seem anything.
i have function updategeometry want call rendergeometry function modify 1 of variable of springmass object. want data on written using - offset intended.
const int num_vertices_per_line = 2; const int numfloatspervertices = 6; const int vertex_byte_size = numfloatspervertices * sizeof(float); glint numspringindices, nummassindices; #define num_array_elements(a) sizeof(a) / sizeof(*a); spring::spring() : anchorposition{ 0.0f, 1.0f, 0.0f }, mposition{ 0.0f, 0.0f, 0.0f }, displacement{ 0.0f, -0.3f, 0.0f } { using_atlas_gl_ns; //short atlas gl namespace using_atlas_math_ns; glgenvertexarrays(1, &mvertexarrayobject); glbindvertexarray(mvertexarrayobject); //mspringmass = objectgenerator::makespring(anchorposition, stretch, d); //mmass = objectgenerator::makemass(calculateconnectionpoint(anchorposition), masswidth, massheight); mspringmass = objectgenerator::makespringmass(anchorposition, stretch, d, masswidth, massheight); numspringindices = mspringmass.numindices; glgenbuffers(1, &mvertexbufferobject); glbindbuffer(gl_array_buffer, mvertexbufferobject); glbufferdata(gl_array_buffer, mspringmass.vertexbuffersize(), mspringmass.vertices, gl_static_draw); glenablevertexattribarray(0); glvertexattribpointer(0, 3, gl_float, gl_false, vertex_byte_size, 0); glenablevertexattribarray(1); glvertexattribpointer(1, 3, gl_float, gl_false, vertex_byte_size, (char*)(sizeof(float) * 3)); glgenbuffers(1, &springindexbufferid); glbindbuffer(gl_element_array_buffer, springindexbufferid); glbufferdata(gl_element_array_buffer, mspringmass.indexbuffersize(), mspringmass.indices, gl_static_draw); // path our shaders stored. std::string shaderdir = generated::shaderpaths::getshaderdirectory(); // set information our shaders. std::vector<shaderinfo> shaders { shaderinfo{ gl_vertex_shader, shaderdir + "spring.vs.glsl" }, shaderinfo{ gl_fragment_shader, shaderdir + "spring.fs.glsl" } }; // create new shader , add our list. mshaders.push_back(shaderpointer(new shader)); mshaders[0]->compileshaders(shaders); mshaders[0]->linkshaders(); mshaders[0]->disableshaders(); } spring::~spring() { gldeletevertexarrays(1, &mvertexarrayobject); gldeletebuffers(1, &mspringbuffer); } void spring::rendergeometry(atlas::math::matrix4 projection, atlas::math::matrix4 view) { // avoid warnings unused variables, can use //unused macro. unused(projection); unused(view); mshaders[0]->enableshaders(); updategeometry(); glint displocation = mshaders[0]->getuniformvariable("displacement"); glint anchorlocation = mshaders[0]->getuniformvariable("anchorposition"); gluniform3fv(anchorlocation, 1, &anchorposition[0]); gluniform3fv(displocation, 1, &displacement[0]); glbindvertexarray(mvertexarrayobject); gldrawelements(gl_lines, numspringindices, gl_unsigned_short, 0); mshaders[0]->disableshaders(); } void spring::updategeometry() { //glbindbuffer(gl_array_buffer, mvertexbufferobject); glfloat newd = d * 0; mspringmass = objectgenerator::makespringmass(anchorposition, stretch, newd, masswidth, massheight); //glbuffersubdata(gl_array_buffer, 0, sizeof(mspringmass.vertices), mspringmass.vertices); glnamedbuffersubdata(mvertexbufferobject, 0, sizeof(mspringmass.vertices), mspringmass.vertices); } edit
for clarification here objectgenerator code.
#include "objectgenerator.h" #define num_array_elements(a) sizeof(a) / sizeof(*a); shapedata objectgenerator::makespringmass(glm::vec3 anchorposition, glfloat stretch, glfloat d, glfloat width, glfloat height) { shapedata ret; glm::vec3 springcolor{ 1.0f, 0.0f, 0.0f }, masscolor{ 0.0f, 1.0f, 0.0f }, connectionpoint{ anchorposition.x, anchorposition.y - (18 * d), 0.0f }; static const vertex vertices[] = { glm::vec3(anchorposition.x, anchorposition.y, 0.0f), // 0 springcolor, glm::vec3(anchorposition.x, anchorposition.y - d,0.0f), // 1 springcolor, glm::vec3(anchorposition.x + stretch, anchorposition.y - (2 * d), 0.0f), // 2 springcolor, glm::vec3(anchorposition.x - stretch, anchorposition.y - (4 * d), 0.0f), // 3 springcolor, glm::vec3(anchorposition.x + stretch, anchorposition.y - (6 * d), 0.0f), // 4 springcolor, glm::vec3(anchorposition.x - stretch, anchorposition.y - (8 * d), 0.0f), // 5 springcolor, glm::vec3(anchorposition.x + stretch, anchorposition.y - (10 * d), 0.0f), // 6 springcolor, glm::vec3(anchorposition.x - stretch, anchorposition.y - (12 * d), 0.0f), // 7 springcolor, glm::vec3(anchorposition.x + stretch, anchorposition.y - (14 * d), 0.0f), // 8 springcolor, glm::vec3(anchorposition.x - stretch, anchorposition.y - (16 * d), 0.0f), // 9 springcolor, glm::vec3(anchorposition.x, anchorposition.y - (17 * d), 0.0f), // 10 springcolor, connectionpoint, // 11 springcolor, //=================mass==============// glm::vec3(connectionpoint.x - width, connectionpoint.y, 0.0f), //top left 12 masscolor, glm::vec3(connectionpoint.x + width, connectionpoint.y, 0.0f), //top right 13 masscolor, glm::vec3(connectionpoint.x + width, connectionpoint.y - height, 0.0f), // bottom right 14 masscolor, glm::vec3(connectionpoint.x - width, connectionpoint.y - height, 0.0f), // bottom left 15 masscolor, }; ret.numvertices = num_array_elements(vertices); ret.vertices = new vertex[ret.numvertices]; memcpy(ret.vertices, vertices, sizeof(vertices)); //memcpy(dest, source, size); glushort indices[] = { 0,1 ,1,2, 2,3, 3,4, 4,5, 5,6, 6,7, 7,8, 8,9, 9,10, 10,11, 11,12, 12,13, 13,14, 14,15, 15,12}; //glushort indices[] = { 0,1 ,1,2, 2,3, 3,4, 4,5, 5,6, 6,7, 7,8, 8,9, 9,10, 10,11 }; ret.numindices = num_array_elements(indices); ret.indices = new glushort[ret.numindices]; memcpy(ret.indices, indices, sizeof(indices)); return ret; }
i have figured out.
in object generator class vertices data never updating because left static constqualifiers. glbuffersubdata working overwriting exact same data......
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