Replacing glMultMatrixd with Shaders ...

T Mason · 2014-05-08T12:55:30

Hello, First, thanks to everyone for their help with my earlier posts. Much appreciated... So, my current question has to do with replacing deprecated code. I currently have a dirty mix of old and new stuff that goes like this: /* Somewhere in an initialize function */ glBindVertexArray(mVBONames[INDEX_VAO]); // Create VBOs glGenBuffers(VBO_COUNT - 1, mVBONames); // Save vertex attributes into GPU glBindBuffer(GL_ARRAY_BUFFER, mVBONames[VERTEX_VBO]); glBufferData(GL_ARRAY_BUFFER, lPolygonVertexCount * VERTEX_STRIDE * sizeof(float), lVertices, GL_STATIC_DRAW); delete[] lVertices; if (mHasNormal) { glBindBuffer(GL_ARRAY_BUFFER, mVBONames[NORMAL_VBO]); glBufferData(GL_ARRAY_BUFFER, lPolygonVertexCount * NORMAL_STRIDE * sizeof(float), lNormals, GL_STATIC_DRAW); delete[] lNormals; } if (mHasUV) { glBindBuffer(GL_ARRAY_BUFFER, mVBONames[UV_VBO]); glBufferData(GL_ARRAY_BUFFER, lPolygonVertexCount * UV_STRIDE * sizeof(float), lUVs, GL_STATIC_DRAW); delete[] lUVs; } glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mVBONames[INDEX_VBO]); glBufferData(GL_ELEMENT_ARRAY_BUFFER, lPolygonCount * TRIANGLE_VERTEX_COUNT * sizeof(unsigned int), lIndices, GL_STATIC_DRAW); glBindVertexArray(0); delete[] lIndices; And when I am about to draw later in code [...] glPushMatrix(); glMultMatrixd((const double*)pGlobalPosition); [...] glGenVertexArrays(1, &mVBONames[INDEX_VAO]); glBindVertexArray(mVBONames[INDEX_VAO]); [...] const GLsizei lElementCount = mSubMeshes[pMaterialIndex]->TriangleCount * 3; glDrawElements(GL_TRIANGLES, lElementCount, GL_UNSIGNED_INT, reinterpret_cast<const GLvoid *>(lOffset)); [...] glBindVertexArray(0); [...] glPopMatrix(); I really want to move to shaders and thus remove myself completely from the glPush-Pop stuff and the glMultMatrixd stuff but I am not exactly sure at the moment how. It seems like I would just: Create another array buffer send my global position into that array buffer multiply the buffered vertic data with the global position buffer in a shader and then go from there But is that right? I didn't see an exact tutorial online or writeup on how to replace the glMultMatrixd functionality in shaders as I searched. Any help is appreciated. Thank you for your time.

Graphics and GPU Programming Programming

Started by tmason May 05, 2014 10:12 AM

9 comments, last by tmason 9 years, 11 months ago

tmason

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May 08, 2014 12:55 PM

Thanks to everyone's help I managed to figure this out. I have a separate question about the Model View Projection matrix when it comes to translating objects as well as having this matrix but I will start a separate post for that.

Thanks again.

Replacing glMultMatrixd with Shaders ...

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Replacing glMultMatrixd with Shaders ...

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