void atInitialize_02_cube(void** ppAppData, const char* const args)
{
GLuint texture = 0;
GLenum target;
GLenum glerror;
GLboolean isMipmapped;
GLuint gnDecalFs, gnVs;
GLsizeiptr offset;
KTX_error_code ktxerror;
CubeTextured* pData = (CubeTextured*)atMalloc(sizeof(CubeTextured), 0);
atAssert(pData);
atAssert(ppAppData);
*ppAppData = pData;
pData->bInitialized = GL_FALSE;
pData->gnTexture = 0;
ktxerror = ktxLoadTextureN(args, &texture, &target, NULL, &isMipmapped, &glerror,
0, NULL);
if (KTX_SUCCESS == ktxerror) {
if (target != GL_TEXTURE_2D) {
/* Can only draw 2D textures */
glDeleteTextures(1, &texture);
return;
}
if (isMipmapped)
/* Enable bilinear mipmapping */
/* TO DO: application can consider inserting a key,value pair in the KTX
* file that indicates what type of filtering to use.
*/
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
else
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
atAssert(GL_NO_ERROR == glGetError());
} else {
char message[1024];
int maxchars = sizeof(message)/sizeof(char);
int nchars;
nchars = snprintf(message, maxchars, "Load of texture \"%s\" failed: %s.",
args, ktxErrorString(ktxerror));
if (ktxerror == KTX_GL_ERROR) {
maxchars -= nchars;
nchars += snprintf(&message[nchars], maxchars, " GL error is %#x.", glerror);
}
atMessageBox(message, "Texture load failed", AT_MB_OK|AT_MB_ICONERROR);
}
/* By default dithering is enabled. Dithering does not provide visual improvement
* in this sample so disable it to improve performance.
*/
glDisable(GL_DITHER);
glEnable(GL_CULL_FACE);
glClearColor(0.2f,0.3f,0.4f,1.0f);
// Create a VAO and bind it.
glGenVertexArrays(1, &pData->gnVao);
glBindVertexArray(pData->gnVao);
// Must have vertex data in buffer objects to use VAO's on ES3/GL Core
glGenBuffers(1, &pData->gnVbo);
glBindBuffer(GL_ARRAY_BUFFER, pData->gnVbo);
// Must be done after the VAO is bound
// Use the same buffer for vertex attributes and element indices.
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, pData->gnVbo);
// Create the buffer data store.
glBufferData(GL_ARRAY_BUFFER,
sizeof(cube_face) + sizeof(cube_color) + sizeof(cube_texture)
+ sizeof(cube_normal) + sizeof(cube_index_buffer),
NULL, GL_STATIC_DRAW);
// Interleave data copying and attrib pointer setup so offset is only computed once.
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
glEnableVertexAttribArray(3);
offset = 0;
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(cube_face), cube_face);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(cube_face);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(cube_color), cube_color);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(cube_color);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(cube_texture), cube_texture);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(cube_texture);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(cube_normal), cube_normal);
glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(cube_normal);
pData->iIndicesOffset = offset;
// Either of the following can be used to buffer the data.
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(cube_index_buffer), cube_index_buffer);
//glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, sizeof(cube_index_buffer), cube_index_buffer);
if (makeShader(GL_VERTEX_SHADER, pszVs, &gnVs)) {
if (makeShader(GL_FRAGMENT_SHADER, pszDecalFs, &gnDecalFs)) {
if (makeProgram(gnVs, gnDecalFs, &pData->gnTexProg)) {
pData->gulMvMatrixLocTP = glGetUniformLocation(pData->gnTexProg, "mvmatrix");
pData->gulPMatrixLocTP = glGetUniformLocation(pData->gnTexProg, "pmatrix");
pData->gulSamplerLocTP = glGetUniformLocation(pData->gnTexProg, "sampler");
glUseProgram(pData->gnTexProg);
// We're using the default texture unit 0
glUniform1i(pData->gulSamplerLocTP, 0);
}
}
glDeleteShader(gnVs);
glDeleteShader(gnDecalFs);
}
atAssert(GL_NO_ERROR == glGetError());
pData->bInitialized = GL_TRUE;
}
void atInitialize_01_draw_texture(void** ppAppData, const char* const szArgs,
const char* const szBasePath)
{
GLint iCropRect[4] = {0, 0, 0, 0};
const GLchar* szExtensions = (const GLchar*)glGetString(GL_EXTENSIONS);
const char* filename;
GLuint texture = 0;
GLenum target;
GLboolean isMipmapped;
GLboolean npotTexture;
GLenum glerror;
GLubyte* pKvData;
GLuint kvDataLen;
KTX_dimensions dimensions;
KTX_error_code ktxerror;
KTX_hash_table kvtable;
GLint sign_s = 1, sign_t = 1;
DrawTexture* pData = (DrawTexture*)atMalloc(sizeof(DrawTexture), 0);
atAssert(pData);
atAssert(ppAppData);
*ppAppData = pData;
pData->bInitialized = GL_FALSE;
pData->gnTexture = 0;
if (strstr(szExtensions, "OES_draw_texture") != NULL) {
pData->glDrawTexsOES =
(PFNGLDRAWTEXSOESPROC)SDL_GL_GetProcAddress("glDrawTexsOES");
pData->glDrawTexiOES =
(PFNGLDRAWTEXIOESPROC)SDL_GL_GetProcAddress("glDrawTexiOES");
pData->glDrawTexxOES =
(PFNGLDRAWTEXXOESPROC)SDL_GL_GetProcAddress("glDrawTexxOES");
pData->glDrawTexfOES =
(PFNGLDRAWTEXFOESPROC)SDL_GL_GetProcAddress("glDrawTexfOES");
pData->glDrawTexsvOES =
(PFNGLDRAWTEXSVOESPROC)SDL_GL_GetProcAddress("glDrawTexsvOES");
pData->glDrawTexivOES =
(PFNGLDRAWTEXIVOESPROC)SDL_GL_GetProcAddress("glDrawTexivOES");
pData->glDrawTexxvOES =
(PFNGLDRAWTEXXVOESPROC)SDL_GL_GetProcAddress("glDrawTexxvOES");
pData->glDrawTexfvOES =
(PFNGLDRAWTEXFVOESPROC)SDL_GL_GetProcAddress("glDrawTexfvOES");
} else {
/* Can't do anything */
atMessageBox("This OpenGL ES implementation does not support "
"OES_draw_texture.",
"Can't Run Test", AT_MB_OK|AT_MB_ICONERROR);
return;
}
if (strstr(szExtensions, "OES_texture_npot") != NULL)
pData->bNpotSupported = GL_TRUE;
else
pData->bNpotSupported = GL_FALSE;
if ((filename = strchr(szArgs, ' ')) != NULL) {
if (!strncmp(szArgs, "--npot ", 7)) {
npotTexture = GL_TRUE;
#if defined(DEBUG)
} else {
assert(0); /* Unknown argument in sampleInvocations */
#endif
}
} else {
filename = szArgs;
npotTexture = GL_FALSE;
}
if (npotTexture && !pData->bNpotSupported) {
/* Load error texture. */
filename = "testimages/no-npot.ktx";
}
filename = atStrCat(szBasePath, filename);
if (filename != NULL) {
ktxerror = ktxLoadTextureN(filename, &pData->gnTexture, &target,
&dimensions, &isMipmapped, &glerror,
&kvDataLen, &pKvData);
if (KTX_SUCCESS == ktxerror) {
if (target != GL_TEXTURE_2D) {
/* Can only draw 2D textures */
glDeleteTextures(1, &pData->gnTexture);
return;
}
ktxerror = ktxHashTable_Deserialize(kvDataLen, pKvData, &kvtable);
if (KTX_SUCCESS == ktxerror) {
GLchar* pValue;
GLuint valueLen;
if (KTX_SUCCESS == ktxHashTable_FindValue(kvtable, KTX_ORIENTATION_KEY,
&valueLen, (void*)&pValue))
{
char s, t;
if (sscanf(pValue, /*valueLen,*/ KTX_ORIENTATION2_FMT, &s, &t) == 2) {
if (s == 'l') sign_s = -1;
if (t == 'd') sign_t = -1;
}
}
ktxHashTable_Destroy(kvtable);
free(pKvData);
}
iCropRect[2] = pData->iTexWidth = dimensions.width;
iCropRect[3] = pData->iTexHeight = dimensions.height;
iCropRect[2] *= sign_s;
iCropRect[3] *= sign_t;
glEnable(target);
if (isMipmapped)
/* Enable bilinear mipmapping */
/* TO DO: application can consider inserting a key,value pair in the KTX
* that indicates what type of filtering to use.
*/
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
else
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexParameteriv(target, GL_TEXTURE_CROP_RECT_OES, iCropRect);
/* Check for any errors */
glerror = glGetError();
} else {
char message[1024];
int maxchars = sizeof(message)/sizeof(char);
int nchars;
nchars = snprintf(message, maxchars, "Load of texture \"%s\" failed: ",
filename);
maxchars -= nchars;
if (ktxerror == KTX_GL_ERROR) {
nchars += snprintf(&message[nchars], maxchars, "GL error %#x occurred.", glerror);
} else {
nchars += snprintf(&message[nchars], maxchars, "%s.", ktxErrorString(ktxerror));
}
atMessageBox(message, "Texture load failed", AT_MB_OK | AT_MB_ICONERROR);
pData->iTexWidth = pData->iTexHeight = 50;
pData->gnTexture = 0;
}
atFree((void*)filename, NULL);
} /* else
Out of memory. In which case, a message box is unlikely to work. */
glClearColor(0.4f, 0.4f, 0.5f, 1.0f);
glColor4f(1.0f, 1.0f, 0.0f, 1.0f);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_BYTE, 0, (GLvoid *)frame_position);
pData->bInitialized = GL_TRUE;
}
void atInitialize_01_draw_texture(void** ppAppData, const char* const szArgs,
const char* const szBasePath)
{
const char* filename;
GLfloat* pfQuadTexCoords = quad_texture;
GLfloat fTmpTexCoords[sizeof(quad_texture)/sizeof(GLfloat)];
GLuint texture = 0;
GLenum target;
GLboolean isMipmapped;
GLenum glerror;
GLubyte* pKvData;
GLuint kvDataLen;
GLint sign_s = 1, sign_t = 1;
GLint i;
GLuint gnColorFs, gnDecalFs, gnVs;
GLsizeiptr offset;
KTX_dimensions dimensions;
KTX_error_code ktxerror;
KTX_hash_table kvtable;
DrawTexture* pData = (DrawTexture*)atMalloc(sizeof(DrawTexture), 0);
atAssert(pData);
atAssert(ppAppData);
*ppAppData = pData;
pData->bInitialized = GL_FALSE;
pData->gnTexture = 0;
filename = atStrCat(szBasePath, szArgs);
if (filename != NULL) {
ktxerror = ktxLoadTextureN(filename, &pData->gnTexture, &target,
&dimensions, &isMipmapped, &glerror,
&kvDataLen, &pKvData);
if (KTX_SUCCESS == ktxerror) {
ktxerror = ktxHashTable_Deserialize(kvDataLen, pKvData, &kvtable);
if (KTX_SUCCESS == ktxerror) {
GLchar* pValue;
GLuint valueLen;
if (KTX_SUCCESS == ktxHashTable_FindValue(kvtable, KTX_ORIENTATION_KEY,
&valueLen, (void**)&pValue))
{
char s, t;
if (sscanf(pValue, /*valueLen,*/ KTX_ORIENTATION2_FMT, &s, &t) == 2) {
if (s == 'l') sign_s = -1;
if (t == 'd') sign_t = -1;
}
}
ktxHashTable_Destroy(kvtable);
free(pKvData);
}
if (sign_s < 0 || sign_t < 0) {
// Transform the texture coordinates to get correct image orientation.
int iNumCoords = sizeof(quad_texture) / sizeof(float);
for (i = 0; i < iNumCoords; i++) {
fTmpTexCoords[i] = quad_texture[i];
if (i & 1) { // odd, i.e. a y coordinate
if (sign_t < 1) {
fTmpTexCoords[i] = fTmpTexCoords[i] * -1 + 1;
}
} else { // an x coordinate
if (sign_s < 1) {
fTmpTexCoords[i] = fTmpTexCoords[i] * -1 + 1;
}
}
}
pfQuadTexCoords = fTmpTexCoords;
}
pData->iTexWidth = dimensions.width;
pData->iTexHeight = dimensions.height;
if (isMipmapped)
/* Enable bilinear mipmapping */
/* TO DO: application can consider inserting a key,value pair in the KTX
* that indicates what type of filtering to use.
*/
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
else
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
atAssert(GL_NO_ERROR == glGetError());
} else {
char message[1024];
int maxchars = sizeof(message)/sizeof(char);
int nchars;
nchars = snprintf(message, maxchars, "Load of texture \"%s\" failed: ",
filename);
maxchars -= nchars;
if (ktxerror == KTX_GL_ERROR) {
nchars += snprintf(&message[nchars], maxchars, "GL error %#x occurred.", glerror);
} else {
nchars += snprintf(&message[nchars], maxchars, "%s.", ktxErrorString(ktxerror));
}
atMessageBox(message, "Texture load failed", AT_MB_OK|AT_MB_ICONERROR);
pData->iTexWidth = pData->iTexHeight = 50;
pData->gnTexture = 0;
}
atFree((void*)filename, NULL);
} /* else
Out of memory. In which case, a message box is unlikely to work. */
glClearColor(0.4f, 0.4f, 0.5f, 1.0f);
// Must have vertex data in buffer objects to use VAO's on ES3/GL Core
glGenBuffers(1, &pData->gnVbo);
glBindBuffer(GL_ARRAY_BUFFER, pData->gnVbo);
// Create the buffer data store
glBufferData(GL_ARRAY_BUFFER,
sizeof(frame_position) + sizeof(frame_color) + sizeof(quad_position)
+ sizeof(quad_color) + sizeof(quad_texture),
NULL, GL_STATIC_DRAW);
glGenVertexArrays(2, pData->gnVaos);
// Interleave data copying and attrib pointer setup so offset is only computed once.
// Setup VAO and buffer the data for frame
glBindVertexArray(pData->gnVaos[FRAME]);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
offset = 0;
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(frame_position), frame_position);
glVertexAttribPointer(0, 3, GL_BYTE, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(frame_position);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(frame_color), frame_color);
glVertexAttribPointer(1, 3, GL_BYTE, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(frame_color);
// Setup VAO for quad
glBindVertexArray(pData->gnVaos[QUAD]);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(quad_position), quad_position);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(quad_position);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(quad_color), quad_color);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
offset += sizeof(quad_color);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(quad_texture), pfQuadTexCoords);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offset);
glBindVertexArray(0);
if (makeShader(GL_VERTEX_SHADER, pszVs, &gnVs)) {
if (makeShader(GL_FRAGMENT_SHADER, pszColorFs, &gnColorFs)) {
if (makeProgram(gnVs, gnColorFs, &pData->gnColProg)) {
pData->gulMvMatrixLocCP = glGetUniformLocation(pData->gnColProg, "mvmatrix");
pData->gulPMatrixLocCP = glGetUniformLocation(pData->gnColProg, "pmatrix");
}
}
if (makeShader(GL_FRAGMENT_SHADER, pszDecalFs, &gnDecalFs)) {
if (makeProgram(gnVs, gnDecalFs, &pData->gnTexProg)) {
pData->gulMvMatrixLocTP = glGetUniformLocation(pData->gnTexProg, "mvmatrix");
pData->gulPMatrixLocTP = glGetUniformLocation(pData->gnTexProg, "pmatrix");
pData->gulSamplerLocTP = glGetUniformLocation(pData->gnTexProg, "sampler");
glUseProgram(pData->gnTexProg);
// We're using the default texture unit 0
glUniform1i(pData->gulSamplerLocTP, 0);
}
}
glDeleteShader(gnVs);
glDeleteShader(gnColorFs);
glDeleteShader(gnDecalFs);
}
// Set the quad's mv matrix to scale by the texture size.
// With the pixel-mapping ortho projection set below, the texture will
// be rendered at actual size just like DrawTex*OES.
for (i = 0; i < 16; i++) {
pData->fQuadMvMatrix[i] = atIdentity[i];
pData->fFrameMvMatrix[i] = atIdentity[i];
}
pData->fQuadMvMatrix[0*4 + 0] = (float)pData->iTexWidth / 2;
pData->fQuadMvMatrix[1*4 + 1] = (float)pData->iTexHeight / 2;
atAssert(GL_NO_ERROR == glGetError());
pData->bInitialized = GL_TRUE;
}