bool WebGLCompressedTextureS3TC::supported(WebGLRenderingContextBase* context)
{
Extensions3DUtil* extensionsUtil = context->extensionsUtil();
return extensionsUtil->supportsExtension("GL_EXT_texture_compression_s3tc")
|| (extensionsUtil->supportsExtension("GL_EXT_texture_compression_dxt1")
&& extensionsUtil->supportsExtension("GL_CHROMIUM_texture_compression_dxt3")
&& extensionsUtil->supportsExtension("GL_CHROMIUM_texture_compression_dxt5"));
}
bool WebGLDepthTexture::supported(WebGLRenderingContextBase* context)
{
Extensions3DUtil* extensionsUtil = context->extensionsUtil();
// Emulating the UNSIGNED_INT_24_8_WEBGL texture internal format in terms
// of two separate texture objects is too difficult, so disable depth
// textures unless a packed depth/stencil format is available.
if (!extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"))
return false;
return extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
|| extensionsUtil->supportsExtension("GL_OES_depth_texture")
|| extensionsUtil->supportsExtension("GL_ARB_depth_texture");
}
bool WebGLCompressedTextureASTC::supported(WebGLRenderingContextBase* context)
{
Extensions3DUtil* extensionsUtil = context->extensionsUtil();
return extensionsUtil->supportsExtension("GL_KHR_texture_compression_astc_ldr");
}
bool WebGLCompressedTextureS3TCsRGB::supported(
WebGLRenderingContextBase* context) {
Extensions3DUtil* extensionsUtil = context->extensionsUtil();
return extensionsUtil->supportsExtension(
"GL_EXT_texture_compression_s3tc_srgb");
}
bool WebGLCompressedTextureETC1::supported(WebGLRenderingContextBase* context)
{
Extensions3DUtil* extensionsUtil = context->extensionsUtil();
return extensionsUtil->supportsExtension("GL_OES_compressed_ETC1_RGB8_texture");
}
// static
bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
{
WebGraphicsContext3D* context = webglContext->webContext();
Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
// This is called after we make sure GL_EXT_draw_buffers is supported.
GLint maxDrawBuffers = 0;
GLint maxColorAttachments = 0;
context->getIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
if (maxDrawBuffers < 4 || maxColorAttachments < 4)
return false;
Platform3DObject fbo = context->createFramebuffer();
context->bindFramebuffer(GL_FRAMEBUFFER, fbo);
const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures.
bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
|| extensionsUtil->supportsExtension("GL_OES_depth_texture")
|| extensionsUtil->supportsExtension("GL_ARB_depth_texture"));
bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil")
|| extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"));
Platform3DObject depthStencil = 0;
if (supportsDepthStencil) {
depthStencil = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, depthStencil);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer);
}
Platform3DObject depth = 0;
if (supportsDepth) {
depth = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, depth);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer);
}
Vector<Platform3DObject> colors;
bool ok = true;
GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
for (GLint i = 0; i < maxAllowedBuffers; ++i) {
Platform3DObject color = context->createTexture();
colors.append(color);
context->bindTexture(GL_TEXTURE_2D, color);
context->texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
if (supportsDepth) {
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
if (supportsDepthStencil) {
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
}
webglContext->restoreCurrentFramebuffer();
context->deleteFramebuffer(fbo);
webglContext->restoreCurrentTexture2D();
if (supportsDepth)
context->deleteTexture(depth);
if (supportsDepthStencil)
context->deleteTexture(depthStencil);
for (size_t i = 0; i < colors.size(); ++i)
context->deleteTexture(colors[i]);
return ok;
}
// static
bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
{
gpu::gles2::GLES2Interface* gl = webglContext->contextGL();
Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
// This is called after we make sure GL_EXT_draw_buffers is supported.
GLint maxDrawBuffers = 0;
GLint maxColorAttachments = 0;
gl->GetIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
gl->GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
if (maxDrawBuffers < 4 || maxColorAttachments < 4)
return false;
GLuint fbo;
gl->GenFramebuffers(1, &fbo);
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures.
bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
|| extensionsUtil->supportsExtension("GL_OES_depth_texture")
|| extensionsUtil->supportsExtension("GL_ARB_depth_texture"));
bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil")
|| extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"));
GLuint depthStencil = 0;
if (supportsDepthStencil) {
gl->GenTextures(1, &depthStencil);
gl->BindTexture(GL_TEXTURE_2D, depthStencil);
gl->TexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer);
}
GLuint depth = 0;
if (supportsDepth) {
gl->GenTextures(1, &depth);
gl->BindTexture(GL_TEXTURE_2D, depth);
gl->TexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer);
}
Vector<GLuint> colors;
bool ok = true;
GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
for (GLint i = 0; i < maxAllowedBuffers; ++i) {
GLuint color;
gl->GenTextures(1, &color);
colors.append(color);
gl->BindTexture(GL_TEXTURE_2D, color);
gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
if (supportsDepth) {
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
if (supportsDepthStencil) {
// For ES 2.0 contexts DEPTH_STENCIL is not available natively, so we emulate it
// at the command buffer level for WebGL contexts.
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
}
webglContext->restoreCurrentFramebuffer();
gl->DeleteFramebuffers(1, &fbo);
webglContext->restoreCurrentTexture2D();
if (supportsDepth)
gl->DeleteTextures(1, &depth);
if (supportsDepthStencil)
gl->DeleteTextures(1, &depthStencil);
gl->DeleteTextures(colors.size(), colors.data());
return ok;
}
