void templateAppDraw(void)
{
static const float POSITION[8] = {
0.0f, 0.0f, // Down left (pivot point)
1.0f, 0.0f, // Up left
0.0f, 1.0f, // Down right
1.0f, 1.0f // Up right
};
static const float COLOR[16] = {
1.0f, 0.0f, 0.0f, 1.0f, // Red
0.0f, 1.0f, 0.0f, 1.0f, // Green
0.0f, 0.0f, 1.0f, 1.0f, // Blue
1.0f, 1.0f, 0.0f, 1.0f // Yellow
};
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
GFX_set_matrix_mode(MODELVIEW_MATRIX);
GFX_load_identity();
GFX_scale(100.0f, 100.0f, 0.0f);
if (program->pid) {
char attribute, uniform;
glUseProgram(program->pid);
uniform = PROGRAM_get_uniform_location(program, (char *)"MODELVIEWPROJECTIONMATRIX");
glUniformMatrix4fv(uniform, 1 /* How many 4x4 matrix */ ,
GL_FALSE /* Transpose the matrix? */ ,
(float *)GFX_get_modelview_projection_matrix());
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"POSITION");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 2, GL_FLOAT, GL_FALSE, 0, POSITION);
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"COLOR");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 4, GL_FLOAT, GL_FALSE, 0, COLOR);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
}
void templateAppInit(int width, int height)
{
GFX_start();
glViewport(0.0f, 0.0f, width, height);
GFX_set_matrix_mode(PROJECTION_MATRIX);
GFX_load_identity();
GFX_set_perspective(45.0f, (float)width / (float)height, 0.1f, 100.0f, 0.0f);
program = PROGRAM_create((char *)"default", VERTEX_SHADER, FRAGMENT_SHADER, 1, DEBUG_SHADERS, NULL, program_draw_callback);
obj = OBJ_load(OBJ_FILE, 1);
unsigned char *vertex_array = NULL, *vertex_start = NULL;
unsigned int i = 0, index = 0, stride = 0, size = 0;
objmesh = &obj->objmesh[0];
size = objmesh->n_objvertexdata * sizeof(vec3) * sizeof(vec3) * sizeof(vec2);
vertex_array = (unsigned char *)malloc(size);
vertex_start = vertex_array;
while (i != objmesh->n_objvertexdata) {
index = objmesh->objvertexdata[i].vertex_index;
memcpy(vertex_array, &obj->indexed_vertex[index], sizeof(vec3));
vertex_array += sizeof(vec3);
memcpy(vertex_array, &obj->indexed_normal[index], sizeof(vec3));
vertex_array += sizeof(vec3);
memcpy(vertex_array, &obj->indexed_uv[objmesh->objvertexdata[i].uv_index], sizeof(vec2));
vertex_array += sizeof(vec2);
++i;
}
glGenBuffers(1, &objmesh->vbo);
glBindBuffer(GL_ARRAY_BUFFER, objmesh->vbo);
glBufferData(GL_ARRAY_BUFFER, size, vertex_start, GL_STATIC_DRAW);
free(vertex_start);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &objmesh->objtrianglelist[0].vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, objmesh->objtrianglelist[0].vbo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, objmesh->objtrianglelist[0].n_indice_array * sizeof(unsigned short), objmesh->objtrianglelist[0].indice_array, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
unsigned char attribute;
stride = sizeof(vec3) + sizeof(vec3) + sizeof(vec2);
glGenVertexArraysOES(1, &objmesh->vao);
glBindVertexArrayOES(objmesh->vao);
glBindBuffer(GL_ARRAY_BUFFER, objmesh->vbo);
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"POSITION");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 3, GL_FLOAT, GL_FALSE, stride, (void *)NULL);
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"NORMAL");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 3, GL_FLOAT, GL_FALSE, stride, BUFFER_OFFSET(sizeof(vec3)));
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"TEXCOORD0");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 2, GL_FLOAT, GL_FALSE, stride, BUFFER_OFFSET(sizeof(vec3) + sizeof(vec3)));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, objmesh->objtrianglelist[0].vbo);
glBindVertexArrayOES(0);
texture = TEXTURE_create(obj->objmaterial[0].map_diffuse, obj->objmaterial[0].map_diffuse, 1, TEXTURE_MIPMAP, TEXTURE_FILTER_2X, 0.0f);
}
/*!
Helper function to debug draw the navigation mesh. Call this function at the end of your
rendering loop to overlay the navigation mesh on top of your current scene.
\param[in] navigation A valid NAVIGATION structure pointer.
*/
void NAVIGATION_draw( NAVIGATION *navigation )
{
if( !navigation->program )
{
navigation->program = PROGRAM_init( navigation->name );
navigation->program->vertex_shader = SHADER_init( navigation->name, GL_VERTEX_SHADER );
SHADER_compile( navigation->program->vertex_shader,
"uniform highp mat4 MODELVIEWPROJECTIONMATRIX;"
"attribute highp vec3 POSITION;"
"void main( void ) {"
"gl_Position = MODELVIEWPROJECTIONMATRIX * vec4( POSITION, 1.0 ); }",
0 );
navigation->program->fragment_shader = SHADER_init( navigation->name, GL_FRAGMENT_SHADER );
SHADER_compile( navigation->program->fragment_shader,
"void main( void ) {"
"gl_FragColor = vec4( 0.25, 0.5, 1.0, 0.65 ); }",
0 );
PROGRAM_link( navigation->program, 0 );
}
char vertex_attribute = PROGRAM_get_vertex_attrib_location( navigation->program,
( char * )"POSITION" );
glBindVertexArrayOES( 0 );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
PROGRAM_draw( navigation->program );
glUniformMatrix4fv( PROGRAM_get_uniform_location( navigation->program, ( char * )"MODELVIEWPROJECTIONMATRIX"),
1,
GL_FALSE,
( float * )GFX_get_modelview_projection_matrix() );
glEnableVertexAttribArray( vertex_attribute );
unsigned int j = 0;
while( j != navigation->dtnavmesh->getMaxTiles() )
{
dtMeshTile *_dtMeshTile = navigation->dtnavmesh->getTile( j );
if( !_dtMeshTile->header )
{ continue; }
unsigned int k = 0;
while( k != _dtMeshTile->header->polyCount )
{
dtPoly *_dtPoly = &_dtMeshTile->polys[ k ];
if( _dtPoly->type == DT_POLYTYPE_OFFMESH_CONNECTION )
{ continue; }
else
{
dtPolyDetail* pd = &_dtMeshTile->detailMeshes[ k ];
unsigned int l = 0;
while( l != pd->triCount )
{
vec3 v[ 3 ];
const unsigned char *t = &_dtMeshTile->detailTris[ ( pd->triBase + l ) << 2 ];
int m = 2;
while( m != -1 )
{
if( t[ m ] < _dtPoly->vertCount )
{
memcpy( &v[ m ],
&_dtMeshTile->verts[ _dtPoly->verts[ t[ m ] ] * 3 ],
sizeof( vec3 ) );
recast_to_vec3( &v[ m ] );
}
else
{
memcpy( &v[ m ],
&_dtMeshTile->detailVerts[ ( pd->vertBase + t[ m ] - _dtPoly->vertCount ) * 3 ],
sizeof( vec3 ) );
recast_to_vec3( &v[ m ] );
}
--m;
}
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 0, ( float * )v );
glDrawArrays( GL_TRIANGLES, 0, 3 );
++l;
}
}
++k;
}
++j;
}
glDisable( GL_BLEND );
}
//获取obj文件，再获取该文件的网格
void templateAppInit( int width, int height ) {
atexit( templateAppExit );
GFX_start();
glViewport( 0.0f, 0.0f, width, height );
GFX_set_matrix_mode( PROJECTION_MATRIX );
GFX_load_identity();
//建立透视投影矩阵
GFX_set_perspective( 45.0f,
( float )width / ( float )height,
0.1f,
100.0f,
0.0f );
//新建一个可自动加载、编译和链接着色器程序的着色器程序
program = PROGRAM_create( ( char * )"default",
VERTEX_SHADER,
FRAGMENT_SHADER,
1,
DEBUG_SHADERS,
NULL, //属性回调函数
program_draw_callback ); //绘制回调函数
//加载obj文件
obj = OBJ_load( OBJ_FILE, 1 );
unsigned char *vertex_array = NULL,
*vertex_start = NULL;
unsigned int i = 0,
index = 0,
stride = 0,
size = 0;
//获取结构指针中第一个网格的指针，
objmesh = &obj->objmesh[ 0 ]; //里面包含多个obj文件的实体
//计算顶点数据数组的总大小，以便可以分配为VBO构建GLES友好的顶点数据数组所需的内存大小
size = objmesh->n_objvertexdata * sizeof( vec3 ) * sizeof( vec3 );
vertex_array = ( unsigned char * ) malloc( size );
vertex_start = vertex_array;
//根据索引的顶点位置以及objmesh结构中包含的顶点法线构建顶点数据数组
while( i != objmesh->n_objvertexdata ) {
index = objmesh->objvertexdata[ i ].vertex_index;
memcpy( vertex_array,
&obj->indexed_vertex[ index ],
sizeof( vec3 ) );
vertex_array += sizeof( vec3 );
memcpy( vertex_array,
&obj->indexed_normal[ index ],
sizeof( vec3 ) );
vertex_array += sizeof( vec3 );
++i;
}
//请求驱动程序为VBO创建一个新的缓冲区索引，并使其处于活动状态
glGenBuffers( 1, &objmesh->vbo );
glBindBuffer( GL_ARRAY_BUFFER, objmesh->vbo );
//将顶点数据数组从本地存储器转移到视频存储器
glBufferData( GL_ARRAY_BUFFER,
size,
vertex_start,
GL_STATIC_DRAW );
free( vertex_start );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
//----------------------------------------------------
//为第一个objmesh三角形列表创建一个新id，并使当前索引处于活动状态
glGenBuffers( 1, &objmesh->objtrianglelist[ 0 ].vbo );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER,
objmesh->objtrianglelist[ 0 ].vbo );
//以类似发送数组缓冲区的方式，将该索引数组发送到GPU
glBufferData( GL_ELEMENT_ARRAY_BUFFER,
objmesh->objtrianglelist[ 0 ].n_indice_array *
sizeof( unsigned short ),
objmesh->objtrianglelist[ 0 ].indice_array,
GL_STATIC_DRAW );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
//创建VAO
//计算不同顶点数据之间的顶点数组跨度
unsigned char attribute;
stride = sizeof( vec3 )+
sizeof( vec3 );
//创建一个新的VAO索引，并使其保持活动状态
glGenVertexArraysOES( 1, &objmesh->vao );
glBindVertexArrayOES( objmesh->vao );
//开始构建VAO列表绑定，其中包括相关的调用来设置数组缓冲区
glBindBuffer( GL_ARRAY_BUFFER, objmesh->vbo );
//在VAO列表中包括POSITION顶点属性调用
attribute = PROGRAM_get_vertex_attrib_location( program, ( char * )"POSITION" );
glEnableVertexAttribArray( attribute );
glVertexAttribPointer( attribute,
3,
GL_FLOAT,
GL_FALSE,
stride,
( void * )NULL );
//--------------------------------------------------------
//以处理顶点位置相同的方式处理顶点法线，但是顶点属性指针调用的最后一个参数稍有不同，必须指定距离下一个
//数据类型的偏移量
attribute = PROGRAM_get_vertex_attrib_location( program, ( char * )"NORMAL" );
glEnableVertexAttribArray( attribute );
glVertexAttribPointer( attribute,
3,
GL_FLOAT,
GL_FALSE,
stride,
BUFFER_OFFSET( sizeof( vec3 ) ) );
//在关闭VAO列表之前绑定数组元素缓冲区（索引）
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER,
objmesh->objtrianglelist[ 0 ].vbo );
//停用当前的VAO，其次对前面所调用的类似数组的所有命令进行编译，然后将它们与VAO索引相关亮
glBindVertexArrayOES( 0 );
}
void templateAppDraw( void )
{
static const float POSITION[ 12 ] = {
-0.5f, 0.0f, -0.5f, // Bottom left
0.5f, 0.0f, -0.5f,
-0.5f, 0.0f, 0.5f,
0.5f, 0.0f, 0.5f // Top right
};
static const float COLOR[ 16 ] = {
1.0f, 0.0f, 0.0f, 1.0f, // Red
0.0f, 1.0f, 0.0f, 1.0f, // Green
0.0f, 0.0f, 1.0f, 1.0f, // Blue
1.0f, 1.0f, 0.0f, 1.0f // Yellow
};
glClearColor( 0.5f, 0.5f, 0.5f, 1.0f );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
GFX_set_matrix_mode( MODELVIEW_MATRIX );
GFX_load_identity();
vec3 e = { 0.0f, -3.0f, 0.0f },
c = { 0.0f, 0.0f, 0.0f },
u = { 0.0f, 0.0f, 1.0f };
GFX_look_at( &e, &c, &u );
static float y = 0.0f;
y += 0.1f;
//GFX_translate( 0.0f, y, 0.0f );
GFX_rotate( y * 50.0f,
1.0f,
1.0f,
1.0f );
if( program->pid ) {
char attribute, uniform;
glUseProgram( program->pid );
uniform = PROGRAM_get_uniform_location( program,
( char * )"MODELVIEWPROJECTIONMATRIX" );
glUniformMatrix4fv( uniform,
1 /* How many 4x4 matrix */,
GL_FALSE /* Transpose the matrix? */,
( float * )GFX_get_modelview_projection_matrix() );
attribute = PROGRAM_get_vertex_attrib_location( program,
( char * )"POSITION" );
glEnableVertexAttribArray( attribute );
glVertexAttribPointer( attribute, 3, GL_FLOAT, GL_FALSE, 0, POSITION );
attribute = PROGRAM_get_vertex_attrib_location( program,
( char * )"COLOR" );
glEnableVertexAttribArray( attribute );
glVertexAttribPointer( attribute, 4, GL_FLOAT, GL_FALSE, 0, COLOR );
glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
}
}
void FONT_print( FONT *font, float x, float y, char *text, vec4 *color )
{
char vertex_attribute = PROGRAM_get_vertex_attrib_location( font->program,
( char * )"POSITION" ),
texcoord_attribute = PROGRAM_get_vertex_attrib_location( font->program,
( char * )"TEXCOORD0" );
glBindVertexArrayOES( 0 );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
glDisable( GL_CULL_FACE );
glDisable( GL_DEPTH_TEST );
glDepthMask( GL_FALSE );
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
PROGRAM_draw( font->program );
glUniformMatrix4fv( PROGRAM_get_uniform_location( font->program, ( char * )"MODELVIEWPROJECTIONMATRIX"),
1,
GL_FALSE,
( float * )GFX_get_modelview_projection_matrix() );
glUniform1i( PROGRAM_get_uniform_location( font->program, ( char * )"DIFFUSE" ), 0 );
if( color ) glUniform4fv( PROGRAM_get_uniform_location( font->program, ( char * )"COLOR" ), 1, ( float * )color );
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, font->tid );
glEnableVertexAttribArray( vertex_attribute );
glEnableVertexAttribArray( texcoord_attribute );
while( *text )
{
if( *text >= font->first_character &&
*text <= ( font->first_character + font->count_character ) )
{
vec2 vert[ 4 ];
vec2 uv[ 4 ];
stbtt_aligned_quad quad;
stbtt_bakedchar *bakedchar = font->character_data + ( *text - font->first_character );
int round_x = STBTT_ifloor( x + bakedchar->xoff );
int round_y = STBTT_ifloor( y - bakedchar->yoff );
quad.x0 = ( float )round_x;
quad.y0 = ( float )round_y;
quad.x1 = ( float )round_x + bakedchar->x1 - bakedchar->x0;
quad.y1 = ( float )round_y - bakedchar->y1 + bakedchar->y0;
quad.s0 = bakedchar->x0 / ( float )font->texture_width;
quad.t0 = bakedchar->y0 / ( float )font->texture_width;
quad.s1 = bakedchar->x1 / ( float )font->texture_height;
quad.t1 = bakedchar->y1 / ( float )font->texture_height;
x += bakedchar->xadvance;
vert[ 0 ].x = quad.x1; vert[ 0 ].y = quad.y0;
uv [ 0 ].x = quad.s1; uv [ 0 ].y = quad.t0;
vert[ 1 ].x = quad.x0; vert[ 1 ].y = quad.y0;
uv [ 1 ].x = quad.s0; uv [ 1 ].y = quad.t0;
vert[ 2 ].x = quad.x1; vert[ 2 ].y = quad.y1;
uv [ 2 ].x = quad.s1; uv [ 2 ].y = quad.t1;
vert[ 3 ].x = quad.x0; vert[ 3 ].y = quad.y1;
uv [ 3 ].x = quad.s0; uv [ 3 ].y = quad.t1;
glVertexAttribPointer( vertex_attribute,
2,
GL_FLOAT,
GL_FALSE,
0,
( float * )&vert[ 0 ] );
glVertexAttribPointer( texcoord_attribute,
2,
GL_FLOAT,
GL_FALSE,
0,
( float * )&uv[ 0 ] );
glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
}
++text;
}
glEnable( GL_CULL_FACE );
glEnable( GL_DEPTH_TEST );
glDepthMask( GL_TRUE );
glDisable( GL_BLEND );
}