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explicitly bind generic attribute locations

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This commit is contained in:
Josh Holtrop 2011-04-30 09:49:23 -04:00
parent 1371328c8b
commit d3c509e966
1 changed files with 13 additions and 9 deletions
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22
template/test.cc
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@ -27,7 +27,10 @@ const GLushort indices[] = {
0, 1, 2, 3, 4, 5
};
GLuint program, vs, fs, data_vbo, index_vbo;
GLint pos_loc, color_loc;
enum Locations {
LOC_POSITION,
LOC_COLOR
};
char * loadFile(const char *fname)
{
@ -145,6 +148,10 @@ bool init(int width, int height)
program = glCreateProgram();
glAttachShader(program, vs);
glAttachShader(program, fs);
glBindAttribLocation(program, LOC_POSITION, "pos");
glBindAttribLocation(program, LOC_COLOR, "color");
glLinkProgram(program);
GLint link_status;
@ -159,9 +166,6 @@ bool init(int width, int height)
return false;
}
pos_loc = glGetAttribLocation(program, "pos");
color_loc = glGetAttribLocation(program, "color");
data_vbo = makeBuffer(GL_ARRAY_BUFFER, data, sizeof(data));
index_vbo = makeBuffer(GL_ELEMENT_ARRAY_BUFFER, indices, sizeof(indices));
@ -173,14 +177,14 @@ void display(void)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, data_vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_vbo);
glEnableVertexAttribArray(pos_loc);
glEnableVertexAttribArray(color_loc);
glVertexAttribPointer(pos_loc, 3, GL_FLOAT, GL_FALSE,
glEnableVertexAttribArray(LOC_POSITION);
glEnableVertexAttribArray(LOC_COLOR);
glVertexAttribPointer(LOC_POSITION, 3, GL_FLOAT, GL_FALSE,
STRIDE(&data[0], &data[1]), OFFSET(&data[0], &data[0][0]));
glVertexAttribPointer(color_loc, 3, GL_FLOAT, GL_FALSE,
glVertexAttribPointer(LOC_COLOR, 3, GL_FLOAT, GL_FALSE,
STRIDE(&data[0], &data[1]), OFFSET(&data[0], &data[0][1]));
glDrawElements(GL_TRIANGLES, sizeof(indices)/sizeof(indices[0]),
GL_UNSIGNED_SHORT, STRIDE(&indices, &indices[0]));
GL_UNSIGNED_SHORT, OFFSET(&indices, &indices[0]));
SDL_GL_SwapBuffers();
}