GLUSvoid GLUSAPIENTRY glusTransposef(GLUSfloat matrix[16])
{
GLUSuint column;
GLUSuint row;
GLUSfloat temp[16];
glusCopyMatrixf(temp, matrix);
for (column = 0; column < 4; column++)
{
for (row = 0; row < 4; row++)
{
matrix[row*4+column] = temp[column*4+row];
}
}
}
/**
* Function to render and display content.
*/
GLUSboolean update(GLUSfloat time)
{
// Angle for rotation
static GLfloat angle = 0.0f;
// Matrix for the model
GLfloat model[16];
// http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/clear.html
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Calculate the model matrix ...
glusLoadIdentityf(model);
glusRotateRzRyRxf(model, 45.0f, angle, 0.0f);
// ... and the view matrix ...
glusLookAtf(g_modelView, 0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glusCopyMatrixf(g_inverseCamera, g_modelView, GLUS_TRUE);
glusInverseMatrixf(g_inverseCamera, g_inverseCamera);
// ... to get the final model view matrix
glusMultMatrixf(g_modelView, g_modelView, model);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniformMatrix4fv(g_modelViewLocation, 1, GL_FALSE, g_modelView);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniformMatrix4fv(g_inverseCameraLocation, 1, GL_FALSE, g_inverseCamera);
// http://www.opengl.org/sdk/docs/man/xhtml/glDrawElements.xml
glDrawElements(GL_TRIANGLES, 6 * 2 * 3, GL_UNSIGNED_INT, 0);
angle += 20.0f * time;
return GLUS_TRUE;
}
/**
* Renders the water
*/
GLUSvoid renderWater(GLUSfloat passedTime, GLUSfloat angle)
{
static WaveParameters waveParameters[NUMBERWAVES];
static WaveDirections waveDirections[NUMBERWAVES];
static GLfloat overallSteepness = 0.2f;
GLfloat model[16];
// Calculate the model matrix ...
glusLoadIdentityf(model);
// ... and the view matrix ...
glusLookAtf(g_modelView, 0.0f, 1.0f, 0.0f, (GLfloat)0.5f * sinf(angle), 1.0f, -(GLfloat)0.5f * cosf(angle), 0.0f, 1.0f, 0.0f);
// ... to get the final model view matrix
glusMultMatrixf(g_modelView, g_modelView, model);
// Copy the original view matrix ...
glusCopyMatrixf(g_inverseCamera, g_modelView, GLUS_TRUE);
// ... and inverse it
glusInverseMatrixf(g_inverseCamera, g_inverseCamera);
memset(waveParameters, 0, sizeof(waveParameters));
memset(waveDirections, 0, sizeof(waveDirections));
// Waves can be faded in and out.
// Wave One
waveParameters[0].speed = 1.0f;
waveParameters[0].amplitude = 0.01f;
waveParameters[0].wavelength = 4.0f;
waveParameters[0].steepness = overallSteepness/(waveParameters[0].wavelength*waveParameters[0].amplitude*(GLfloat)NUMBERWAVES);
waveDirections[0].x = +1.0f;
waveDirections[0].z = +1.0f;
// Wave Two
waveParameters[1].speed = 0.5f;
waveParameters[1].amplitude = 0.02f;
waveParameters[1].wavelength = 3.0f;
waveParameters[1].steepness = overallSteepness/(waveParameters[1].wavelength*waveParameters[1].amplitude*(GLfloat)NUMBERWAVES);
waveDirections[1].x = +1.0f;
waveDirections[1].z = +0.0f;
// Wave Thre
waveParameters[2].speed = 0.1f;
waveParameters[2].amplitude = 0.015f;
waveParameters[2].wavelength = 2.0f;
waveParameters[2].steepness = overallSteepness/(waveParameters[1].wavelength*waveParameters[1].amplitude*(GLfloat)NUMBERWAVES);
waveDirections[2].x = -0.1f;
waveDirections[2].z = -0.2f;
// Wave Four
waveParameters[3].speed = 1.1f;
waveParameters[3].amplitude = 0.008f;
waveParameters[3].wavelength = 1.0f;
waveParameters[3].steepness = overallSteepness/(waveParameters[1].wavelength*waveParameters[1].amplitude*(GLfloat)NUMBERWAVES);
waveDirections[3].x = -0.2f;
waveDirections[3].z = -0.1f;
// http://www.opengl.org/sdk/docs/man/xhtml/glUseProgram.xml
glUseProgram(g_program.program);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniformMatrix4fv(g_modelViewLocation, 1, GL_FALSE, g_modelView);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniformMatrix4fv(g_inverseCameraLocation, 1, GL_FALSE, g_inverseCamera);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniform1f(g_passedTimeLocation, passedTime);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniform4fv(g_waveParametersLocation, 4*NUMBERWAVES, (GLfloat*)waveParameters);
// http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml
glUniform2fv(g_waveDirectionsLocation, 2*NUMBERWAVES, (GLfloat*)waveDirections);
// ToDo:
glBindVertexArray(g_vao);
// ToDo:
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
//http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/disable.html
glDisable(GL_CULL_FACE);
// http://www.opengl.org/sdk/docs/man/xhtml/glDrawElements.xml
glDrawElements(GL_TRIANGLE_STRIP, WATER_PLANE_LENGTH*(WATER_PLANE_LENGTH-1)*2, GL_UNSIGNED_INT, 0);
}