void TinyGLRenderer::setupCameraPerspective(float pitch, float heading, float fov) {
// TODO: Find a correct and exact formula for the FOV
TGLfloat glFOV = 0.63 * fov; // Approximative and experimental formula
if (fov > 79.0 && fov < 81.0)
glFOV = 50.5; // Somewhat good value for fov == 80
else if (fov > 59.0 && fov < 61.0)
glFOV = 36.0; // Somewhat good value for fov == 60
// NOTE: tinyGL viewport implementation needs to be checked as it doesn't behave the same as openGL
tglViewport(0, kTopBorderHeight, kOriginalWidth, kFrameHeight);
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
Math::Matrix4 m = Math::makePerspectiveMatrix(glFOV, (TGLfloat)kOriginalWidth / (TGLfloat)kFrameHeight, 1.0, 10000.0);
tglMultMatrixf(m.getData());
// Rotate the model to simulate the rotation of the camera
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglRotatef(pitch, -1.0f, 0.0f, 0.0f);
tglRotatef(heading - 180.0f, 0.0f, 1.0f, 0.0f);
tglGetFloatv(TGL_MODELVIEW_MATRIX, _cubeModelViewMatrix);
tglGetFloatv(TGL_PROJECTION_MATRIX, _cubeProjectionMatrix);
tglGetIntegerv(TGL_VIEWPORT, (TGLint *)_cubeViewport);
}
void TinyGLRenderer::setupCameraOrtho2D() {
tglViewport(0, 0, kOriginalWidth, kOriginalHeight);
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
tglOrtho(0.0, kOriginalWidth, kOriginalHeight, 0.0, -1.0, 1.0);
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
}
void GfxTinyGL::setupCamera(float fov, float nclip, float fclip, float roll) {
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
float right = nclip * tan(fov / 2 * (LOCAL_PI / 180));
tglFrustum(-right, right, -right * 0.75, right * 0.75, nclip, fclip);
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglRotatef(roll, 0, 0, -1);
}
// Zoom into the cube
inline void scene1(float scene_time)
{
tglClear(TGL_COLOR_BUFFER_BIT);
float min_zoom = -10;
float max_zoom = -2.5;
float zoom = min_zoom + (max_zoom-min_zoom) * (float)scene_time/timeline[scene];
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglTranslatef(0, 0, zoom);
tglBegin(TGL_LINES);
for(int p=0; p<8; ++p) {
tglVertex3fv(cube[cubestrip1[p]]);
}
tglEnd();
tglBegin(TGL_LINES);
for(int p=0; p<8; ++p) {
tglVertex3fv(cube[cubestrip2[p]]);
}
tglEnd();
tglSwap();
delay(50);
}
// Spinning Cube!
inline void scene2(float scene_time)
{
int i = scene_time / 25;
tglClear(TGL_COLOR_BUFFER_BIT);
float zoom = 0;
if(scene_time > 5000)
zoom = 0.5*sin((float)(i-20)/10.0);
float rot_speed = 1.0;
if(scene_time > 12000)
rot_speed += (float)(scene_time - 12000) / 1500.0;
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglTranslatef(0, 0, -2.5+zoom);
tglRotatef((float)(i % 360) * rot_speed, 0, 1, 0);
tglRotatef((float)(i % 360) * rot_speed, 1, 1, 0);
tglBegin(TGL_LINES);
for(int p=0; p<8; ++p) {
tglVertex3fv(cube[cubestrip1[p]]);
}
tglEnd();
tglBegin(TGL_LINES);
for(int p=0; p<8; ++p) {
tglVertex3fv(cube[cubestrip2[p]]);
}
tglEnd();
tglSwap();
}
void TinyGLRenderer::init(Graphics::PixelBuffer &screenBuffer) {
debug("Initializing Software 3D Renderer");
_nonPowerOfTwoTexSupport = true;
_fb = new TinyGL::FrameBuffer(kOriginalWidth, kOriginalHeight, screenBuffer);
TinyGL::glInit(_fb, 512);
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglDisable(TGL_LIGHTING);
tglEnable(TGL_TEXTURE_2D);
tglEnable(TGL_DEPTH_TEST);
}
void TinyGLRenderer::init() {
debug("Initializing Software 3D Renderer");
computeScreenViewport();
Graphics::PixelBuffer screenBuffer = _system->getScreenPixelBuffer();
_fb = new TinyGL::FrameBuffer(kOriginalWidth, kOriginalHeight, screenBuffer);
TinyGL::glInit(_fb, 512);
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglDisable(TGL_LIGHTING);
tglEnable(TGL_TEXTURE_2D);
tglEnable(TGL_DEPTH_TEST);
}
void GfxTinyGL::drawSprite(const Sprite *sprite) {
tglMatrixMode(TGL_TEXTURE);
tglLoadIdentity();
tglMatrixMode(TGL_MODELVIEW);
tglPushMatrix();
tglTranslatef(sprite->_pos.x(), sprite->_pos.y(), sprite->_pos.z());
TGLfloat modelview[16];
tglGetFloatv(TGL_MODELVIEW_MATRIX, modelview);
// We want screen-aligned sprites so reset the rotation part of the matrix.
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (i == j) {
modelview[i * 4 + j] = 1.0f;
} else {
modelview[i * 4 + j] = 0.0f;
}
}
}
tglLoadMatrixf(modelview);
tglDisable(TGL_LIGHTING);
tglBegin(TGL_POLYGON);
tglTexCoord2f(0.0f, 0.0f);
tglVertex3f(sprite->_width / 2, sprite->_height, 0.0f);
tglTexCoord2f(0.0f, 1.0f);
tglVertex3f(sprite->_width / 2, 0.0f, 0.0f);
tglTexCoord2f(1.0f, 1.0f);
tglVertex3f(-sprite->_width / 2, 0.0f, 0.0f);
tglTexCoord2f(1.0f, 0.0f);
tglVertex3f(-sprite->_width / 2, sprite->_height, 0.0f);
tglEnd();
tglEnable(TGL_LIGHTING);
tglPopMatrix();
}
void glInit(void *zbuffer1, int textureSize) {
FrameBuffer *zbuffer = (FrameBuffer *)zbuffer1;
GLContext *c;
GLViewport *v;
if ((textureSize & (textureSize - 1)))
error("glInit: texture size not power of two: %d", textureSize);
if (textureSize <= 1 || textureSize > 4096)
error("glInit: texture size not allowed: %d", textureSize);
c = new GLContext();
gl_ctx = c;
c->fb = zbuffer;
c->fb->_textureSize = c->_textureSize = textureSize;
c->fb->_textureSizeMask = (textureSize - 1) << ZB_POINT_ST_FRAC_BITS;
// allocate GLVertex array
c->vertex_max = POLYGON_MAX_VERTEX;
c->vertex = (GLVertex *)gl_malloc(POLYGON_MAX_VERTEX * sizeof(GLVertex));
// viewport
v = &c->viewport;
v->xmin = 0;
v->ymin = 0;
v->xsize = zbuffer->xsize;
v->ysize = zbuffer->ysize;
v->updated = 1;
// shared state
initSharedState(c);
// lists
c->exec_flag = 1;
c->compile_flag = 0;
c->print_flag = 0;
c->in_begin = 0;
// lights
for (int i = 0; i < T_MAX_LIGHTS; i++) {
GLLight *l = &c->lights[i];
l->ambient = Vector4(0, 0, 0, 1);
if (i == 0) {
l->diffuse = Vector4(1, 1, 1, 1);
l->specular = Vector4(1, 1, 1, 1);
l->has_specular = true;
} else {
l->diffuse = Vector4(0, 0, 0, 1);
l->specular = Vector4(0, 0, 0, 1);
l->has_specular = false;
}
l->position = Vector4(0, 0, 1, 0);
l->spot_direction = Vector3(0, 0, -1);
l->spot_exponent = 0;
l->spot_cutoff = 180;
l->attenuation[0] = 1;
l->attenuation[1] = 0;
l->attenuation[2] = 0;
l->cos_spot_cutoff = -1.0f;
l->norm_spot_direction = Vector3(0, 0, -1);
l->norm_position = Vector3(0, 0, 1);
l->enabled = 0;
l->next = NULL;
l->prev = NULL;
}
c->first_light = NULL;
c->ambient_light_model = Vector4(0.2f, 0.2f, 0.2f, 1);
c->local_light_model = 0;
c->lighting_enabled = 0;
c->light_model_two_side = 0;
// default materials */
for (int i = 0; i < 2; i++) {
GLMaterial *m = &c->materials[i];
m->emission = Vector4(0, 0, 0, 1);
m->ambient = Vector4(0.2f, 0.2f, 0.2f, 1);
m->diffuse = Vector4(0.8f, 0.8f, 0.8f, 1);
m->specular = Vector4(0, 0, 0, 1);
m->has_specular = false;
m->shininess = 0;
}
c->current_color_material_mode = TGL_FRONT_AND_BACK;
c->current_color_material_type = TGL_AMBIENT_AND_DIFFUSE;
c->color_material_enabled = 0;
// textures
glInitTextures(c);
// default state
c->current_color = Vector4(1.0f, 1.0f, 1.0f, 1.0f);
c->longcurrent_color[0] = 65535;
c->longcurrent_color[1] = 65535;
c->longcurrent_color[2] = 65535;
c->longcurrent_color[3] = 65535;
c->current_normal = Vector4(1.0f, 0.0f, 0.0f, 0.0f);
c->current_edge_flag = 1;
c->current_tex_coord = Vector4(0.0f, 0.0f, 0.0f, 1.0f);
c->polygon_mode_front = TGL_FILL;
c->polygon_mode_back = TGL_FILL;
c->current_front_face = 0; // 0 = GL_CCW 1 = GL_CW
c->current_cull_face = TGL_BACK;
c->current_shade_model = TGL_SMOOTH;
c->cull_face_enabled = 0;
// clear
c->clear_color = Vector4(0.0f, 0.0f, 0.0f, 0.0f);
c->clear_depth = 0;
// selection
c->render_mode = TGL_RENDER;
c->select_buffer = NULL;
c->name_stack_size = 0;
// blending
c->fb->enableBlending(false);
// alpha test
c->fb->enableAlphaTest(false);
// matrix
c->matrix_mode = 0;
c->matrix_stack_depth_max[0] = MAX_MODELVIEW_STACK_DEPTH;
c->matrix_stack_depth_max[1] = MAX_PROJECTION_STACK_DEPTH;
c->matrix_stack_depth_max[2] = MAX_TEXTURE_STACK_DEPTH;
for (int i = 0; i < 3; i++) {
c->matrix_stack[i] = (Matrix4 *)gl_zalloc(c->matrix_stack_depth_max[i] * sizeof(Matrix4));
c->matrix_stack_ptr[i] = c->matrix_stack[i];
}
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
tglMatrixMode(TGL_TEXTURE);
tglLoadIdentity();
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
tglBlendFunc(TGL_SRC_ALPHA, TGL_ONE_MINUS_SRC_ALPHA);
tglAlphaFunc(TGL_ALWAYS, 0.f);
tglDepthFunc(TGL_LESS);
c->matrix_model_projection_updated = 1;
// opengl 1.1 arrays
c->client_states = 0;
// opengl 1.1 polygon offset
c->offset_states = 0;
// shadow mode
c->shadow_mode = 0;
// clear the resize callback function pointer
c->gl_resize_viewport = NULL;
// specular buffer
c->specbuf_first = NULL;
c->specbuf_used_counter = 0;
c->specbuf_num_buffers = 0;
// depth test
c->depth_test = 0;
c->color_mask = (1 << 24) | (1 << 16) | (1 << 8) | (1 << 0);
const int kDrawCallMemory = 5 * 1024 * 1024;
c->_currentAllocatorIndex = 0;
c->_drawCallAllocator[0].initialize(kDrawCallMemory);
c->_drawCallAllocator[1].initialize(kDrawCallMemory);
c->_enableDirtyRectangles = false;
Graphics::Internal::tglBlitSetScissorRect(0, 0, c->fb->xsize, c->fb->ysize);
}
void glInit(void *zbuffer1) {
ZBuffer *zbuffer = (ZBuffer *)zbuffer1;
GLContext *c;
GLViewport *v;
c = (GLContext *)gl_zalloc(sizeof(GLContext));
gl_ctx = c;
c->zb = zbuffer;
// allocate GLVertex array
c->vertex_max = POLYGON_MAX_VERTEX;
c->vertex = (GLVertex *)gl_malloc(POLYGON_MAX_VERTEX * sizeof(GLVertex));
// viewport
v = &c->viewport;
v->xmin = 0;
v->ymin = 0;
v->xsize = zbuffer->xsize;
v->ysize = zbuffer->ysize;
v->updated = 1;
// shared state
initSharedState(c);
// lists
c->exec_flag = 1;
c->compile_flag = 0;
c->print_flag = 0;
c->in_begin = 0;
// lights
for (int i = 0; i < T_MAX_LIGHTS; i++) {
GLLight *l = &c->lights[i];
l->ambient = gl_V4_New(0, 0, 0, 1);
l->diffuse = gl_V4_New(1, 1, 1, 1);
l->specular = gl_V4_New(1, 1, 1, 1);
l->position = gl_V4_New(0, 0, 1, 0);
l->norm_position = gl_V3_New(0, 0, 1);
l->spot_direction = gl_V3_New(0, 0, -1);
l->norm_spot_direction = gl_V3_New(0, 0, - 1);
l->spot_exponent = 0;
l->spot_cutoff = 180;
l->attenuation[0] = 1;
l->attenuation[1] = 0;
l->attenuation[2] = 0;
l->enabled = 0;
}
c->first_light = NULL;
c->ambient_light_model = gl_V4_New(0.2f, 0.2f, 0.2f, 1);
c->local_light_model = 0;
c->lighting_enabled = 0;
c->light_model_two_side = 0;
// default materials */
for (int i = 0; i < 2; i++) {
GLMaterial *m = &c->materials[i];
m->emission = gl_V4_New(0, 0, 0, 1);
m->ambient = gl_V4_New(0.2f, 0.2f, 0.2f, 1);
m->diffuse = (gl_V4_New(0.8f, 0.8f, 0.8f, 1));
m->specular = gl_V4_New(0, 0, 0, 1);
m->shininess = 0;
}
c->current_color_material_mode = TGL_FRONT_AND_BACK;
c->current_color_material_type = TGL_AMBIENT_AND_DIFFUSE;
c->color_material_enabled = 0;
// textures
glInitTextures(c);
// default state
c->current_color.X = 1.0;
c->current_color.Y = 1.0;
c->current_color.Z = 1.0;
c->current_color.W = 1.0;
c->longcurrent_color[0] = 65535;
c->longcurrent_color[1] = 65535;
c->longcurrent_color[2] = 65535;
c->current_normal.X = 1.0;
c->current_normal.Y = 0.0;
c->current_normal.Z = 0.0;
c->current_normal.W = 0.0;
c->current_edge_flag = 1;
c->current_tex_coord.X = 0;
c->current_tex_coord.Y = 0;
c->current_tex_coord.Z = 0;
c->current_tex_coord.W = 1;
c->polygon_mode_front = TGL_FILL;
c->polygon_mode_back = TGL_FILL;
c->current_front_face = 0; // 0 = GL_CCW 1 = GL_CW
c->current_cull_face = TGL_BACK;
c->current_shade_model = TGL_SMOOTH;
c->cull_face_enabled = 0;
// clear
c->clear_color.v[0] = 0;
c->clear_color.v[1] = 0;
c->clear_color.v[2] = 0;
c->clear_color.v[3] = 0;
c->clear_depth = 0;
// selection
c->render_mode = TGL_RENDER;
c->select_buffer = NULL;
c->name_stack_size = 0;
// matrix
c->matrix_mode = 0;
c->matrix_stack_depth_max[0] = MAX_MODELVIEW_STACK_DEPTH;
c->matrix_stack_depth_max[1] = MAX_PROJECTION_STACK_DEPTH;
c->matrix_stack_depth_max[2] = MAX_TEXTURE_STACK_DEPTH;
for (int i = 0; i < 3; i++) {
c->matrix_stack[i] = (M4 *)gl_zalloc(c->matrix_stack_depth_max[i] * sizeof(M4));
c->matrix_stack_ptr[i] = c->matrix_stack[i];
}
tglMatrixMode(TGL_PROJECTION);
tglLoadIdentity();
tglMatrixMode(TGL_TEXTURE);
tglLoadIdentity();
tglMatrixMode(TGL_MODELVIEW);
tglLoadIdentity();
c->matrix_model_projection_updated = 1;
// opengl 1.1 arrays
c->client_states = 0;
// opengl 1.1 polygon offset
c->offset_states = 0;
// shadow mode
c->shadow_mode = 0;
// clear the resize callback function pointer
c->gl_resize_viewport = NULL;
// specular buffer
c->specbuf_first = NULL;
c->specbuf_used_counter = 0;
c->specbuf_num_buffers = 0;
// depth test
c->depth_test = 0;
c->color_mask = (1 << 24) | (1 << 16) | (1 << 8) | (1 << 0);
}
