void m4x4_rotate(matrix_4x4* mtx, float angle, float x, float y, float z, bool bRightSide)
{
float axis[3];
float sine = sinf(angle);
float cosine = cosf(angle);
float one_minus_cosine = 1.0f - cosine;
matrix_4x4 rm, om;
vector_4f vec = { { 1.0f, z, y, x } };
v4f_norm4(&vec);
axis[0] = vec.x;
axis[1] = vec.y;
axis[2] = vec.z;
m4x4_zeros(&rm);
rm.r[0].x = cosine + (one_minus_cosine * axis[0] * axis[0]);
rm.r[0].y = (one_minus_cosine * axis[0] * axis[1]) - (axis[2] * sine);
rm.r[0].z = (one_minus_cosine * axis[0] * axis[2]) + (axis[1] * sine);
rm.r[1].x = (one_minus_cosine * axis[0] * axis[1]) + (axis[2] * sine);
rm.r[1].y = cosine + (one_minus_cosine * axis[1] * axis[1]);
rm.r[1].z = (one_minus_cosine * axis[1] * axis[2]) - (axis[0] * sine);
rm.r[2].x = (one_minus_cosine * axis[0] * axis[2]) - (axis[1] * sine);
rm.r[2].y = (one_minus_cosine * axis[1] * axis[2]) + (axis[0] * sine);
rm.r[2].z = cosine + (one_minus_cosine * axis[2] * axis[2]);
rm.r[3].w = 1.0f;
if (bRightSide) m4x4_multiply(&om, mtx, &rm);
else m4x4_multiply(&om, &rm, mtx);
m4x4_copy(mtx, &om);
}
/**
* Calculate a perspective projection transformation.
*
* @param m the matrix to save the transformation in
* @param fovy the field of view in the y direction
* @param aspect the view aspect ratio
* @param zNear the near clipping plane
* @param zFar the far clipping plane
*/
void m4x4_perspective(GLfloat *m, GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
{
GLfloat tmp[16];
m4x4_identity(tmp);
float sine, cosine, cotangent, deltaZ;
GLfloat radians = fovy / 2.0 * M_PI / 180.0;
deltaZ = zFar - zNear;
sine = sinf(radians);
cosine = cosf(radians);
if ((deltaZ == 0) || (sine == 0) || (aspect == 0))
return;
cotangent = cosine / sine;
tmp[0] = cotangent / aspect;
tmp[5] = cotangent;
tmp[10] = -(zFar + zNear) / deltaZ;
tmp[11] = -1;
tmp[14] = -2 * zNear * zFar / deltaZ;
tmp[15] = 0;
m4x4_copy(m, tmp);
}
void glPushMatrix() {
int mode = ctr_state.matrix_current;
int depth = ctr_state.matrix_depth[mode];
matrix_4x4 *mat = &ctr_state.matrix[mode][depth];
if (mat == 0 || depth < 0 || depth >= 30) {
return;
}
m4x4_copy(mat + 1, mat);
ctr_state.matrix_depth[mode]++;
}
/**
* Transposes a 4x4 matrix.
*
* @param m the matrix to transpose
*/
static void m4x4_transpose(GLfloat *m)
{
const GLfloat t[16] = {
m[0], m[4], m[8], m[12],
m[1], m[5], m[9], m[13],
m[2], m[6], m[10], m[14],
m[3], m[7], m[11], m[15]};
m4x4_copy(m, t);
}
/**
* Creates an identity 4x4 matrix.
*
* @param m the matrix make an identity matrix
*/
static void m4x4_identity(GLfloat *m)
{
static const GLfloat t[16] = {
1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0,
};
m4x4_copy(m, t);
}
void m4x4_translate(matrix_4x4* mtx, float x, float y, float z)
{
matrix_4x4 tm, om;
m4x4_identity(&tm);
tm.m[3] = x;
tm.m[7] = y;
tm.m[11] = z;
m4x4_multiply(&om, mtx, &tm);
m4x4_copy(mtx, &om);
}
void m4x4_translate(matrix_4x4* mtx, float x, float y, float z)
{
matrix_4x4 tm, om;
m4x4_identity(&tm);
tm.r[0].w = x;
tm.r[1].w = y;
tm.r[2].w = z;
m4x4_multiply(&om, mtx, &tm);
m4x4_copy(mtx, &om);
}
/**
* Multiplies two 4x4 matrices.
*
* The result is stored in matrix m.
*
* @param m the first matrix to multiply
* @param n the second matrix to multiply
*/
static void m4x4_multiply(GLfloat *m, const GLfloat *n)
{
GLfloat tmp[16];
const GLfloat *row, *column;
div_t d;
int i, j;
for (i = 0; i < 16; i++) {
tmp[i] = 0;
d = div(i, 4);
row = n + d.quot * 4;
column = m + d.rem;
for (j = 0; j < 4; j++)
tmp[i] += row[j] * column[j * 4];
}
m4x4_copy(m, tmp);
}
void m4x4_rotate_z(matrix_4x4* mtx, float angle, bool bRightSide)
{
matrix_4x4 rm, om;
float cosAngle = cosf(angle);
float sinAngle = sinf(angle);
m4x4_zeros(&rm);
rm.m[0] = cosAngle;
rm.m[1] = sinAngle;
rm.m[4] = -sinAngle;
rm.m[5] = cosAngle;
rm.m[10] = 1.0f;
rm.m[15] = 1.0f;
if (bRightSide) m4x4_multiply(&om, mtx, &rm);
else m4x4_multiply(&om, &rm, mtx);
m4x4_copy(mtx, &om);
}
void m4x4_rotate_z(matrix_4x4* mtx, float angle, bool bRightSide)
{
matrix_4x4 rm, om;
float cosAngle = cosf(angle);
float sinAngle = sinf(angle);
m4x4_zeros(&rm);
rm.r[0].x = cosAngle;
rm.r[0].y = sinAngle;
rm.r[1].x = -sinAngle;
rm.r[1].y = cosAngle;
rm.r[2].z = 1.0f;
rm.r[3].w = 1.0f;
if (bRightSide) m4x4_multiply(&om, mtx, &rm);
else m4x4_multiply(&om, &rm, mtx);
m4x4_copy(mtx, &om);
}
/**
* Draws a gear in GLES 2 mode.
*
* @param gear the gear to draw
* @param transform the current transformation matrix
* @param x the x position to draw the gear at
* @param y the y position to draw the gear at
* @param angle the rotation angle of the gear
* @param color the color of the gear
*/
static void draw_gearGLES2(gear_t *gear, GLfloat *transform,
GLfloat x, GLfloat y, GLfloat angle)
{
// The direction of the directional light for the scene */
static const GLfloat LightSourcePosition[4] = { 5.0, 5.0, 10.0, 1.0};
GLfloat model_view[16];
GLfloat normal_matrix[16];
GLfloat model_view_projection[16];
/* Translate and rotate the gear */
m4x4_copy(model_view, transform);
m4x4_translate(model_view, x, y, 0);
m4x4_rotate(model_view, angle, 0, 0, 1);
/* Create and set the ModelViewProjectionMatrix */
m4x4_copy(model_view_projection, state->ProjectionMatrix);
m4x4_multiply(model_view_projection, model_view);
glUniformMatrix4fv(state->ModelViewProjectionMatrix_location, 1, GL_FALSE,
model_view_projection);
glUniformMatrix4fv(state->ModelViewMatrix_location, 1, GL_FALSE,
model_view);
/* Set the LightSourcePosition uniform in relation to the object */
glUniform4fv(state->LightSourcePosition_location, 1, LightSourcePosition);
glUniform1i(state->DiffuseMap_location, 0);
/*
* Create and set the NormalMatrix. It's the inverse transpose of the
* ModelView matrix.
*/
m4x4_copy(normal_matrix, model_view);
m4x4_invert(normal_matrix);
m4x4_transpose(normal_matrix);
glUniformMatrix4fv(state->NormalMatrix_location, 1, GL_FALSE, normal_matrix);
/* Set the gear color */
glUniform4fv(state->MaterialColor_location, 1, gear->color);
if (state->useVBO) {
glBindBuffer(GL_ARRAY_BUFFER, gear->vboId);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gear->iboId);
}
/* Set up the position of the attributes in the vertex buffer object */
// setup where vertex data is
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,
sizeof(vertex_t), gear->vertex_p);
// setup where normal data is
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,
sizeof(vertex_t), gear->normal_p);
// setup where uv data is
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE,
sizeof(vertex_t), gear->texCoords_p);
/* Enable the attributes */
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
// Bind texture surface to current vertices
glBindTexture(GL_TEXTURE_2D, state->texId);
glDrawElements(state->drawMode, gear->tricount, GL_UNSIGNED_SHORT,
gear->index_p);
/* Disable the attributes */
glDisableVertexAttribArray(2);
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(0);
}
