bool
WebGLContext::DrawArrays_check(const char* funcName, GLenum mode, GLint first,
GLsizei vertCount, GLsizei instanceCount)
{
if (!ValidateDrawModeEnum(mode, funcName))
return false;
if (!ValidateNonNegative(funcName, "first", first) ||
!ValidateNonNegative(funcName, "vertCount", vertCount) ||
!ValidateNonNegative(funcName, "instanceCount", instanceCount))
{
return false;
}
if (!ValidateStencilParamsForDrawCall())
return false;
if (IsWebGL2() && !gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
if (mPrimRestartTypeBytes != 0) {
mPrimRestartTypeBytes = 0;
// OSX appears to have severe perf issues with leaving this enabled.
gl->fDisable(LOCAL_GL_PRIMITIVE_RESTART);
}
}
if (!vertCount || !instanceCount)
return false; // No error, just early out.
if (!ValidateBufferFetching(funcName))
return false;
const auto checked_firstPlusCount = CheckedInt<GLsizei>(first) + vertCount;
if (!checked_firstPlusCount.isValid()) {
ErrorInvalidOperation("%s: overflow in first+vertCount", funcName);
return false;
}
if (uint32_t(checked_firstPlusCount.value()) > mMaxFetchedVertices) {
ErrorInvalidOperation("%s: Bound vertex attribute buffers do not have sufficient"
" size for given first and count.",
funcName);
return false;
}
return true;
}
bool
WebGLContext::DrawElements_check(GLsizei count, GLenum type,
WebGLintptr byteOffset, GLsizei primcount,
const char* info, GLuint* out_upperBound)
{
if (count < 0 || byteOffset < 0) {
ErrorInvalidValue("%s: negative count or offset", info);
return false;
}
if (primcount < 0) {
ErrorInvalidValue("%s: negative primcount", info);
return false;
}
if (!ValidateStencilParamsForDrawCall()) {
return false;
}
// If count is 0, there's nothing to do.
if (count == 0 || primcount == 0)
return false;
uint8_t bytesPerElem = 0;
switch (type) {
case LOCAL_GL_UNSIGNED_BYTE:
bytesPerElem = 1;
break;
case LOCAL_GL_UNSIGNED_SHORT:
bytesPerElem = 2;
break;
case LOCAL_GL_UNSIGNED_INT:
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_element_index_uint)) {
bytesPerElem = 4;
}
break;
}
if (!bytesPerElem) {
ErrorInvalidEnum("%s: Invalid `type`: 0x%04x", info, type);
return false;
}
if (byteOffset % bytesPerElem != 0) {
ErrorInvalidOperation("%s: `byteOffset` must be a multiple of the size of `type`",
info);
return false;
}
const GLsizei first = byteOffset / bytesPerElem;
const CheckedUint32 checked_byteCount = bytesPerElem * CheckedUint32(count);
if (!checked_byteCount.isValid()) {
ErrorInvalidValue("%s: overflow in byteCount", info);
return false;
}
// Any checks below this depend on a program being available.
if (!mCurrentProgram) {
ErrorInvalidOperation("%s: null CURRENT_PROGRAM", info);
return false;
}
if (!mBoundVertexArray->mElementArrayBuffer) {
ErrorInvalidOperation("%s: must have element array buffer binding", info);
return false;
}
WebGLBuffer& elemArrayBuffer = *mBoundVertexArray->mElementArrayBuffer;
if (!elemArrayBuffer.ByteLength()) {
ErrorInvalidOperation("%s: bound element array buffer doesn't have any data", info);
return false;
}
CheckedInt<GLsizei> checked_neededByteCount = checked_byteCount.toChecked<GLsizei>() + byteOffset;
if (!checked_neededByteCount.isValid()) {
ErrorInvalidOperation("%s: overflow in byteOffset+byteCount", info);
return false;
}
if (uint32_t(checked_neededByteCount.value()) > elemArrayBuffer.ByteLength()) {
ErrorInvalidOperation("%s: bound element array buffer is too small for given count and offset", info);
return false;
}
if (!ValidateBufferFetching(info))
return false;
if (!mMaxFetchedVertices ||
!elemArrayBuffer.Validate(type, mMaxFetchedVertices - 1, first, count, out_upperBound))
{
ErrorInvalidOperation(
"%s: bound vertex attribute buffers do not have sufficient "
"size for given indices from the bound element array", info);
return false;
}
if (uint32_t(primcount) > mMaxFetchedInstances) {
ErrorInvalidOperation("%s: bound instance attribute buffers do not have sufficient size for given primcount", info);
return false;
}
// Bug 1008310 - Check if buffer has been used with a different previous type
if (elemArrayBuffer.IsElementArrayUsedWithMultipleTypes()) {
GenerateWarning("%s: bound element array buffer previously used with a type other than "
"%s, this will affect performance.",
info,
WebGLContext::EnumName(type));
}
MOZ_ASSERT(gl->IsCurrent());
if (mBoundDrawFramebuffer) {
if (!mBoundDrawFramebuffer->ValidateAndInitAttachments(info))
return false;
} else {
ClearBackbufferIfNeeded();
}
if (!DoFakeVertexAttrib0(mMaxFetchedVertices)) {
return false;
}
return true;
}
bool
WebGLContext::DrawArrays_check(GLint first, GLsizei count, GLsizei primcount,
const char* info)
{
if (first < 0 || count < 0) {
ErrorInvalidValue("%s: negative first or count", info);
return false;
}
if (primcount < 0) {
ErrorInvalidValue("%s: negative primcount", info);
return false;
}
if (!ValidateStencilParamsForDrawCall()) {
return false;
}
// If count is 0, there's nothing to do.
if (count == 0 || primcount == 0) {
return false;
}
// Any checks below this depend on a program being available.
if (!mCurrentProgram) {
ErrorInvalidOperation("%s: null CURRENT_PROGRAM", info);
return false;
}
if (!ValidateBufferFetching(info)) {
return false;
}
CheckedInt<GLsizei> checked_firstPlusCount = CheckedInt<GLsizei>(first) + count;
if (!checked_firstPlusCount.isValid()) {
ErrorInvalidOperation("%s: overflow in first+count", info);
return false;
}
if (uint32_t(checked_firstPlusCount.value()) > mMaxFetchedVertices) {
ErrorInvalidOperation("%s: bound vertex attribute buffers do not have sufficient size for given first and count", info);
return false;
}
if (uint32_t(primcount) > mMaxFetchedInstances) {
ErrorInvalidOperation("%s: bound instance attribute buffers do not have sufficient size for given primcount", info);
return false;
}
MOZ_ASSERT(gl->IsCurrent());
if (mBoundDrawFramebuffer) {
if (!mBoundDrawFramebuffer->ValidateAndInitAttachments(info))
return false;
} else {
ClearBackbufferIfNeeded();
}
if (!DoFakeVertexAttrib0(checked_firstPlusCount.value())) {
return false;
}
return true;
}