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POAssist me to understand OpenGL glGenBuffers
 

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  1. POAssist me to understand OpenGL glGenBuffers
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    <p>Here is the deal. If I leave the code with glGenBuffers(1, vertexBuffers), the code compiles are works. But, I thought that it should be 2 since vertexBuffers is of size two. </p> <p>Am I missing something? </p> <p>Code below:</p> <pre><code>-(void)drawRect:(NSRect)dirtyRect { // get program ID for shader program GLuint programID = [self loadShaders]; // get new dimensions NSSize dim = [self frame].size; // clear the background with color glClearColor(0.0, 0.0, 0.0, 0.4); glDepthRange(0.1, 100.0); glViewport(0, 0, dim.width, dim.height); glClear(GL_COLOR_BUFFER_BIT); // vertex data GLfloat vertexPositionData[] = {-dim.width/2, -dim.height/2, 0.0, 5.0, dim.width/2, -dim.height/2, 0.0, 5.0, 0.0, dim.height/2, 0.0, 5.0}; GLfloat vertexColorData[] = {1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.5, 0.0, 0.0, 1.0, 0.5}; GLfloat scaleMatrixData[] = {1/(dim.width/2), 0.0, 0.0, 0.0, 0.0, 1/(dim.height/2), 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0}; GLint scaleMatrixUniform = glGetUniformLocation(programID, "scaleMatrix"); // generate a buffer for our triangle glGenBuffers(1, vertexBuffers); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffers[0]); glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositionData), vertexPositionData, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffers[1]); glBufferData(GL_ARRAY_BUFFER, sizeof(vertexColorData), vertexColorData, GL_STATIC_DRAW); //glBindBuffer(GL_ARRAY_BUFFER, 0); glUseProgram(programID); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffers[0]); glEnableVertexAttribArray(VERTEX_POS_INDEX); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffers[1]); glEnableVertexAttribArray(VERTEX_COLOR_INDEX); glVertexAttribPointer(VERTEX_POS_INDEX, VERTEX_POS_SIZE, GL_FLOAT, GL_FALSE, 0, vertexPositionData); glVertexAttribPointer(VERTEX_COLOR_INDEX, VERTEX_COLOR_SIZE, GL_FLOAT, GL_FALSE, 0, vertexColorData); glUniformMatrix4fv(scaleMatrixUniform, 1, GL_FALSE, scaleMatrixData); glDrawArrays(GL_TRIANGLES, 0, 3); glDisableVertexAttribArray(0); glDisableVertexAttribArray(1); glUseProgram(0); // flush buffer glFlush(); [[self openGLContext] flushBuffer]; } </code></pre>
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    1. COWhat's the declaration of `vertexBuffers`?
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    2. CO@JWWalker, I mention that vertexBuffers is of size two array.
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